<article>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#article09_12_15_226239</id>
	<title>Boeing's 787 Dreamliner Takes Flight</title>
	<author>kdawson</author>
	<datestamp>1260872820000</datestamp>
	<htmltext>Bordgious and a number of other readers sent word of the <a href="http://www.reuters.com/article/idUSTRE5BE20720091215">787 Dreamliner's first flight</a> after <a href="//tech.slashdot.org/story/09/08/16/2259254/Production-of-Boeing-787-Dreamliner-Delayed-Again">two years</a> of <a href="//tech.slashdot.org/story/08/04/13/0033207/Boeing-787-Dreamliner-Delayed-Again">delays</a>. The four-hour test kicks off nine months of airborne testing. Aviation Week has <a href="http://www.aviationweek.com/aw/eventType3.do?eventName=787\_first\_flight">video of the test flight</a> and a timeline of the 787's development. Here is the <a href="http://flightaware.com/live/flight/BOE1">flight path</a>. 840 of the planes are on order now, down from a high of 910, as some customers canceled orders due to the delays.</htmltext>
<tokenext>Bordgious and a number of other readers sent word of the 787 Dreamliner 's first flight after two years of delays .
The four-hour test kicks off nine months of airborne testing .
Aviation Week has video of the test flight and a timeline of the 787 's development .
Here is the flight path .
840 of the planes are on order now , down from a high of 910 , as some customers canceled orders due to the delays .</tokentext>
<sentencetext>Bordgious and a number of other readers sent word of the 787 Dreamliner's first flight after two years of delays.
The four-hour test kicks off nine months of airborne testing.
Aviation Week has video of the test flight and a timeline of the 787's development.
Here is the flight path.
840 of the planes are on order now, down from a high of 910, as some customers canceled orders due to the delays.</sentencetext>
</article>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30452454</id>
	<title>Re:ill-informed nonsense</title>
	<author>GumphMaster</author>
	<datestamp>1260884160000</datestamp>
	<modclass>Insightful</modclass>
	<modscore>4</modscore>
	<htmltext><p>The issues with composite materials are not with their strength or reliability during normal operation.   The issues are predominantly with their failure modes.   Much effort goes into detecting cracks and flaws <i>before</i> they become catastrophic.  In aluminium spars and panels there are several good ways to detect cracks before their size becomes structurally significant: MK 1 eyeball, xrays, ultrasonics etc.  The same tools for large composite structures are less developed in commercial circles, but they will get there.  Boeing, and A&#233;rospatiale, are acutely aware of these weakness in inspection ability and have done a lot of work to fill the gaps.</p><p>Not getting on an aircraft containing composite structures because of a perceived danger of composites is irrational if you then get in a car and drive home.</p></htmltext>
<tokenext>The issues with composite materials are not with their strength or reliability during normal operation .
The issues are predominantly with their failure modes .
Much effort goes into detecting cracks and flaws before they become catastrophic .
In aluminium spars and panels there are several good ways to detect cracks before their size becomes structurally significant : MK 1 eyeball , xrays , ultrasonics etc .
The same tools for large composite structures are less developed in commercial circles , but they will get there .
Boeing , and A   rospatiale , are acutely aware of these weakness in inspection ability and have done a lot of work to fill the gaps.Not getting on an aircraft containing composite structures because of a perceived danger of composites is irrational if you then get in a car and drive home .</tokentext>
<sentencetext>The issues with composite materials are not with their strength or reliability during normal operation.
The issues are predominantly with their failure modes.
Much effort goes into detecting cracks and flaws before they become catastrophic.
In aluminium spars and panels there are several good ways to detect cracks before their size becomes structurally significant: MK 1 eyeball, xrays, ultrasonics etc.
The same tools for large composite structures are less developed in commercial circles, but they will get there.
Boeing, and Aérospatiale, are acutely aware of these weakness in inspection ability and have done a lot of work to fill the gaps.Not getting on an aircraft containing composite structures because of a perceived danger of composites is irrational if you then get in a car and drive home.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451266</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30482062</id>
	<title>Re:Yawn.</title>
	<author>iggymanz</author>
	<datestamp>1261058640000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>he might have been describing a passenger piston prop plane.  There is a pulse jet engine, but i've never heard of one for passenger craft, only unmanned craft</p></htmltext>
<tokenext>he might have been describing a passenger piston prop plane .
There is a pulse jet engine , but i 've never heard of one for passenger craft , only unmanned craft</tokentext>
<sentencetext>he might have been describing a passenger piston prop plane.
There is a pulse jet engine, but i've never heard of one for passenger craft, only unmanned craft</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451408</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30460162</id>
	<title>Re:ill-informed nonsense</title>
	<author>GooberToo</author>
	<datestamp>1259692320000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p><div class="quote"><p>Aluminum has zero stress endurance limit. That means that it WILL crack eventually.</p></div><p>This is true. This is why jets are periodically x-rayed to look for micro fractures and signs of fatigue. As I understand it, this is still a required procedure for composites because they too can fatigue.</p><p>Also, since there is no such thing as a standard composite, every composite is different. This means, unless they are actually using the same composite, which I seriously doubt, any history on one composite is completely meaningless on another composite. That FACT is, the life of composites are unknown and indeterminate according to the FAA and materials experts. Generally the certified life goes up as the fleet ages and can be supported by collected data; for example, see x-rays above.</p><p><div class="quote"><p>Composites are much more reliable and have much lower maintenance costs.</p></div><p>Not sure where you got this information from as every manufacturer of composites will completely disagree with that statement. Composites are expensive. Did I mention they are expensive? They are also extremely labor intensive. Did I mention they are expensive and labor intensive? What can be a very minor repair on aluminum, resulting in little time to repair, can require complete assembly and/or sub-assembly replacement with composites. Why? Because composites can generally not be repaired. That means what was a cheap repair of a part is not a complete part, sub-assembly, or even an entire assembly replacement. With that replacement is corresponding labor.</p><p>Having said all that, by far, as you rightly pointed out, composites age much better in corrosive environments and because of aluminum's catastrophic failure, may be safer. Having said that, generally when aluminum is able to catastrophically fail, its because of lacking inspections. In this same vein, lacking inspections can still be a cause of catastrophic failure with composites too. So while salt isn't likely to be an issue, the jury is still out.</p><p>Also, unlike aluminum, composites have a much higher failure rate in hot environments. In fact, when composites become too hot, catastrophic failure normally follows because of extreme de-lamination which air-flow then makes worse. In fact, some planes becomes grounded when they become too hot. This means operating in places like Death Valley, etc, are actually detrimental to the health of composites. This is untrue for aluminum. So aluminum for Death Valley and Composites for Hawaii?</p><p><div class="quote"><p>There are a lot of composite parts in the triple 7 and they are well documented to be more reliable than the aluminum ones in the 767.</p></div><p>That isn't so much an endorsement of composites as much as it is a failure of design and analysis.</p><p>In short, composites are by no means a panacea of aircraft materials. Like all materials, each comes with its own set of pros and cons.</p></div>
	</htmltext>
<tokenext>Aluminum has zero stress endurance limit .
That means that it WILL crack eventually.This is true .
This is why jets are periodically x-rayed to look for micro fractures and signs of fatigue .
As I understand it , this is still a required procedure for composites because they too can fatigue.Also , since there is no such thing as a standard composite , every composite is different .
This means , unless they are actually using the same composite , which I seriously doubt , any history on one composite is completely meaningless on another composite .
That FACT is , the life of composites are unknown and indeterminate according to the FAA and materials experts .
Generally the certified life goes up as the fleet ages and can be supported by collected data ; for example , see x-rays above.Composites are much more reliable and have much lower maintenance costs.Not sure where you got this information from as every manufacturer of composites will completely disagree with that statement .
Composites are expensive .
Did I mention they are expensive ?
They are also extremely labor intensive .
Did I mention they are expensive and labor intensive ?
What can be a very minor repair on aluminum , resulting in little time to repair , can require complete assembly and/or sub-assembly replacement with composites .
Why ? Because composites can generally not be repaired .
That means what was a cheap repair of a part is not a complete part , sub-assembly , or even an entire assembly replacement .
With that replacement is corresponding labor.Having said all that , by far , as you rightly pointed out , composites age much better in corrosive environments and because of aluminum 's catastrophic failure , may be safer .
Having said that , generally when aluminum is able to catastrophically fail , its because of lacking inspections .
In this same vein , lacking inspections can still be a cause of catastrophic failure with composites too .
So while salt is n't likely to be an issue , the jury is still out.Also , unlike aluminum , composites have a much higher failure rate in hot environments .
In fact , when composites become too hot , catastrophic failure normally follows because of extreme de-lamination which air-flow then makes worse .
In fact , some planes becomes grounded when they become too hot .
This means operating in places like Death Valley , etc , are actually detrimental to the health of composites .
This is untrue for aluminum .
So aluminum for Death Valley and Composites for Hawaii ? There are a lot of composite parts in the triple 7 and they are well documented to be more reliable than the aluminum ones in the 767.That is n't so much an endorsement of composites as much as it is a failure of design and analysis.In short , composites are by no means a panacea of aircraft materials .
Like all materials , each comes with its own set of pros and cons .</tokentext>
<sentencetext>Aluminum has zero stress endurance limit.
That means that it WILL crack eventually.This is true.
This is why jets are periodically x-rayed to look for micro fractures and signs of fatigue.
As I understand it, this is still a required procedure for composites because they too can fatigue.Also, since there is no such thing as a standard composite, every composite is different.
This means, unless they are actually using the same composite, which I seriously doubt, any history on one composite is completely meaningless on another composite.
That FACT is, the life of composites are unknown and indeterminate according to the FAA and materials experts.
Generally the certified life goes up as the fleet ages and can be supported by collected data; for example, see x-rays above.Composites are much more reliable and have much lower maintenance costs.Not sure where you got this information from as every manufacturer of composites will completely disagree with that statement.
Composites are expensive.
Did I mention they are expensive?
They are also extremely labor intensive.
Did I mention they are expensive and labor intensive?
What can be a very minor repair on aluminum, resulting in little time to repair, can require complete assembly and/or sub-assembly replacement with composites.
Why? Because composites can generally not be repaired.
That means what was a cheap repair of a part is not a complete part, sub-assembly, or even an entire assembly replacement.
With that replacement is corresponding labor.Having said all that, by far, as you rightly pointed out, composites age much better in corrosive environments and because of aluminum's catastrophic failure, may be safer.
Having said that, generally when aluminum is able to catastrophically fail, its because of lacking inspections.
In this same vein, lacking inspections can still be a cause of catastrophic failure with composites too.
So while salt isn't likely to be an issue, the jury is still out.Also, unlike aluminum, composites have a much higher failure rate in hot environments.
In fact, when composites become too hot, catastrophic failure normally follows because of extreme de-lamination which air-flow then makes worse.
In fact, some planes becomes grounded when they become too hot.
This means operating in places like Death Valley, etc, are actually detrimental to the health of composites.
This is untrue for aluminum.
So aluminum for Death Valley and Composites for Hawaii?There are a lot of composite parts in the triple 7 and they are well documented to be more reliable than the aluminum ones in the 767.That isn't so much an endorsement of composites as much as it is a failure of design and analysis.In short, composites are by no means a panacea of aircraft materials.
Like all materials, each comes with its own set of pros and cons.
	</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451266</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451100</id>
	<title>Re:Yawn.</title>
	<author>Anonymous</author>
	<datestamp>1260876840000</datestamp>
	<modclass>Insightful</modclass>
	<modscore>4</modscore>
	<htmltext><p>I still marvel at the fact that we can pack a bunch of evolved monkeys into a big steel box, fill it up with stuff that burns, cause thousands of controlled explosions every second to rotate big spin-y things and cause the contraption to soar through the air (and actually land in a controlled fashion).</p><p>Call me old-fashioned.</p></htmltext>
<tokenext>I still marvel at the fact that we can pack a bunch of evolved monkeys into a big steel box , fill it up with stuff that burns , cause thousands of controlled explosions every second to rotate big spin-y things and cause the contraption to soar through the air ( and actually land in a controlled fashion ) .Call me old-fashioned .</tokentext>
<sentencetext>I still marvel at the fact that we can pack a bunch of evolved monkeys into a big steel box, fill it up with stuff that burns, cause thousands of controlled explosions every second to rotate big spin-y things and cause the contraption to soar through the air (and actually land in a controlled fashion).Call me old-fashioned.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451052</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451422</id>
	<title>Re:Yawn.</title>
	<author>pushing-robot</author>
	<datestamp>1260878340000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p><a href="http://www.youtube.com/watch?v=UN0MpBQG3-E" title="youtube.com">Obligatory Louis CK.</a> [youtube.com]</p></htmltext>
<tokenext>Obligatory Louis CK .
[ youtube.com ]</tokentext>
<sentencetext>Obligatory Louis CK.
[youtube.com]</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451100</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30452256</id>
	<title>Re:Visit the plant in Everett.</title>
	<author>Anonymous</author>
	<datestamp>1260882960000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><blockquote><div><p>Cars are made on assembly lines, but planes are too large to use the same techniques. They do it anyway.</p></div></blockquote><p>If they assemble planes using assembly line techniques, then by definition they aren't too large to assemble by assembly line techniques.</p></div>
	</htmltext>
<tokenext>Cars are made on assembly lines , but planes are too large to use the same techniques .
They do it anyway.If they assemble planes using assembly line techniques , then by definition they are n't too large to assemble by assembly line techniques .</tokentext>
<sentencetext>Cars are made on assembly lines, but planes are too large to use the same techniques.
They do it anyway.If they assemble planes using assembly line techniques, then by definition they aren't too large to assemble by assembly line techniques.
	</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451118</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30454564</id>
	<title>Sprooce</title>
	<author>sponga</author>
	<datestamp>1260905160000</datestamp>
	<modclass>Interestin</modclass>
	<modscore>2</modscore>
	<htmltext><p>As a Long Beach, CA resident I can tell you to go there just to see the Spruce Goose. Bastards took it from the Queen Mary down here, but it deserves to be there.<br>The Spruce Goose was no assembly line product, I remember standing in awe of the thing when they had it back in Long Beach and it was so beautifully lit up. Wish I could have been there to see its maiden flight though, as short as Hughes made it.</p></htmltext>
<tokenext>As a Long Beach , CA resident I can tell you to go there just to see the Spruce Goose .
Bastards took it from the Queen Mary down here , but it deserves to be there.The Spruce Goose was no assembly line product , I remember standing in awe of the thing when they had it back in Long Beach and it was so beautifully lit up .
Wish I could have been there to see its maiden flight though , as short as Hughes made it .</tokentext>
<sentencetext>As a Long Beach, CA resident I can tell you to go there just to see the Spruce Goose.
Bastards took it from the Queen Mary down here, but it deserves to be there.The Spruce Goose was no assembly line product, I remember standing in awe of the thing when they had it back in Long Beach and it was so beautifully lit up.
Wish I could have been there to see its maiden flight though, as short as Hughes made it.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451118</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451628</id>
	<title>Re:Visit the plant in Everett.</title>
	<author>rkfig</author>
	<datestamp>1260879420000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>If you happen to have a relative that works there, they have a family tour once a year that you can go on.  They let you down on the work floor for that tour, instead of just up on the catwalks.  The only thing that they have running is one of the ceiling cranes spinning a plane around, so you aren't dodging anything.  If you have the chance, I highly recommend it.</htmltext>
<tokenext>If you happen to have a relative that works there , they have a family tour once a year that you can go on .
They let you down on the work floor for that tour , instead of just up on the catwalks .
The only thing that they have running is one of the ceiling cranes spinning a plane around , so you are n't dodging anything .
If you have the chance , I highly recommend it .</tokentext>
<sentencetext>If you happen to have a relative that works there, they have a family tour once a year that you can go on.
They let you down on the work floor for that tour, instead of just up on the catwalks.
The only thing that they have running is one of the ceiling cranes spinning a plane around, so you aren't dodging anything.
If you have the chance, I highly recommend it.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451118</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30452390</id>
	<title>Re:Yawn.</title>
	<author>Anonymous</author>
	<datestamp>1260883740000</datestamp>
	<modclass>Funny</modclass>
	<modscore>5</modscore>
	<htmltext><p>That's nothing. I'm amazed that we can make these monkeys wait in long lines, take their shoes off and subject themselves to numerous other forms of abuse for the chance to do so.</p><p>I'd have expected the feces-flinging to have started long before we reached this point.</p></htmltext>
<tokenext>That 's nothing .
I 'm amazed that we can make these monkeys wait in long lines , take their shoes off and subject themselves to numerous other forms of abuse for the chance to do so.I 'd have expected the feces-flinging to have started long before we reached this point .</tokentext>
<sentencetext>That's nothing.
I'm amazed that we can make these monkeys wait in long lines, take their shoes off and subject themselves to numerous other forms of abuse for the chance to do so.I'd have expected the feces-flinging to have started long before we reached this point.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451100</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451216</id>
	<title>Re:And the wings might not even fall off in flight</title>
	<author>VoxMagis</author>
	<datestamp>1260877320000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>I'm sure they said the same thing when they started using metal instead of wood ribbing and fabric.</p></htmltext>
<tokenext>I 'm sure they said the same thing when they started using metal instead of wood ribbing and fabric .</tokentext>
<sentencetext>I'm sure they said the same thing when they started using metal instead of wood ribbing and fabric.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451108</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30453478</id>
	<title>Re:And the wings might not even fall off in flight</title>
	<author>greyhueofdoubt</author>
	<datestamp>1260892740000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>Your confidence in aluminum is misplaced.</p><p>Watch the stress test of the 787's wings:<br><a href="http://www.youtube.com/watch?v=bV\_V4U0iX4w" title="youtube.com">http://www.youtube.com/watch?v=bV\_V4U0iX4w</a> [youtube.com]</p><p>I am an aircraft structural maintenance craftsman.</p><p>-b</p></htmltext>
<tokenext>Your confidence in aluminum is misplaced.Watch the stress test of the 787 's wings : http : //www.youtube.com/watch ? v = bV \ _V4U0iX4w [ youtube.com ] I am an aircraft structural maintenance craftsman.-b</tokentext>
<sentencetext>Your confidence in aluminum is misplaced.Watch the stress test of the 787's wings:http://www.youtube.com/watch?v=bV\_V4U0iX4w [youtube.com]I am an aircraft structural maintenance craftsman.-b</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451108</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30453104</id>
	<title>Re:ill-informed nonsense</title>
	<author>frankmu</author>
	<datestamp>1260889080000</datestamp>
	<modclass>Interestin</modclass>
	<modscore>2</modscore>
	<htmltext>It was Aloha Airlines flight 243, not Hawaiian.  My mother fortunately missed flying on that airplane by taking an earlier flight.</htmltext>
<tokenext>It was Aloha Airlines flight 243 , not Hawaiian .
My mother fortunately missed flying on that airplane by taking an earlier flight .</tokentext>
<sentencetext>It was Aloha Airlines flight 243, not Hawaiian.
My mother fortunately missed flying on that airplane by taking an earlier flight.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451266</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30460620</id>
	<title>Re:Yawn.</title>
	<author>DrVomact</author>
	<datestamp>1259694000000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p><div class="quote"><p>Old fashioned?</p><p>I'm an engineer, and a pilot. I *thoroughly* understand the forces involved. I could take a Cessna aircraft apart and identify the majority of the parts by name. I've worked on them repeatedly with an A &amp; P. (aircraft mechanic) I can name all the forces working on a plane (thrust, drag, lift, gravity) and can explain the forces that hold a plane aloft. (Venturi effect) </p></div><p>Er...I think you mean <a href="http://en.wikipedia.org/wiki/Bernoulli's\_principle" title="wikipedia.org">Bernoulli principle</a> [wikipedia.org], yes? </p><p>You'd better get it right, because every time I get on a plane, I am seized by the irrational conviction that if there aren't enough people aboard who believe in the Bernoulli principle, then the plane won't fly. Even worse, we might lose a quorum at high altitudes...</p></div>
	</htmltext>
<tokenext>Old fashioned ? I 'm an engineer , and a pilot .
I * thoroughly * understand the forces involved .
I could take a Cessna aircraft apart and identify the majority of the parts by name .
I 've worked on them repeatedly with an A &amp; P. ( aircraft mechanic ) I can name all the forces working on a plane ( thrust , drag , lift , gravity ) and can explain the forces that hold a plane aloft .
( Venturi effect ) Er...I think you mean Bernoulli principle [ wikipedia.org ] , yes ?
You 'd better get it right , because every time I get on a plane , I am seized by the irrational conviction that if there are n't enough people aboard who believe in the Bernoulli principle , then the plane wo n't fly .
Even worse , we might lose a quorum at high altitudes.. .</tokentext>
<sentencetext>Old fashioned?I'm an engineer, and a pilot.
I *thoroughly* understand the forces involved.
I could take a Cessna aircraft apart and identify the majority of the parts by name.
I've worked on them repeatedly with an A &amp; P. (aircraft mechanic) I can name all the forces working on a plane (thrust, drag, lift, gravity) and can explain the forces that hold a plane aloft.
(Venturi effect) Er...I think you mean Bernoulli principle [wikipedia.org], yes?
You'd better get it right, because every time I get on a plane, I am seized by the irrational conviction that if there aren't enough people aboard who believe in the Bernoulli principle, then the plane won't fly.
Even worse, we might lose a quorum at high altitudes...
	</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30454830</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30455446</id>
	<title>Re:Yawn.</title>
	<author>Anonymous</author>
	<datestamp>1259667360000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>That would be an aluminium tube, and usually two or four continuously controlled thermal events.</p></htmltext>
<tokenext>That would be an aluminium tube , and usually two or four continuously controlled thermal events .</tokentext>
<sentencetext>That would be an aluminium tube, and usually two or four continuously controlled thermal events.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451100</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30454534</id>
	<title>Re:Yawn.</title>
	<author>Anonymous</author>
	<datestamp>1260904800000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>Except that it's aluminum typically, not steel.  Except for the 787, that's composite.</p><p>"Thousands of controlled explosions a second" are what runs piston engines.  These are jet turbines which actually rely on a constant stream of burning fuel -- conflagration, not detonation.</p></htmltext>
<tokenext>Except that it 's aluminum typically , not steel .
Except for the 787 , that 's composite .
" Thousands of controlled explosions a second " are what runs piston engines .
These are jet turbines which actually rely on a constant stream of burning fuel -- conflagration , not detonation .</tokentext>
<sentencetext>Except that it's aluminum typically, not steel.
Except for the 787, that's composite.
"Thousands of controlled explosions a second" are what runs piston engines.
These are jet turbines which actually rely on a constant stream of burning fuel -- conflagration, not detonation.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451100</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451052</id>
	<title>Yawn.</title>
	<author>Anonymous</author>
	<datestamp>1260876600000</datestamp>
	<modclass>Troll</modclass>
	<modscore>-1</modscore>
	<htmltext>A big, really nice plane.  Will wonders never cease?  Oh yeah, FP.</htmltext>
<tokenext>A big , really nice plane .
Will wonders never cease ?
Oh yeah , FP .</tokentext>
<sentencetext>A big, really nice plane.
Will wonders never cease?
Oh yeah, FP.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30452944</id>
	<title>Re:Yawn.</title>
	<author>Anonymous</author>
	<datestamp>1260887580000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>Yeah, but have they tested it on the Hudson yet?</p></htmltext>
<tokenext>Yeah , but have they tested it on the Hudson yet ?</tokentext>
<sentencetext>Yeah, but have they tested it on the Hudson yet?</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451100</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30452344</id>
	<title>Re:Yawn.</title>
	<author>GumphMaster</author>
	<datestamp>1260883500000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>Indeed.   There's no way I'd get on a modern passenger jet if it were generating thousands of controlled explosions in the engines (or elsewhere for that matter).</htmltext>
<tokenext>Indeed .
There 's no way I 'd get on a modern passenger jet if it were generating thousands of controlled explosions in the engines ( or elsewhere for that matter ) .</tokentext>
<sentencetext>Indeed.
There's no way I'd get on a modern passenger jet if it were generating thousands of controlled explosions in the engines (or elsewhere for that matter).</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451408</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451150</id>
	<title>Re:And the wings might not even fall off in flight</title>
	<author>MichaelSmith</author>
	<datestamp>1260877080000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>I wonder if it is light enough to make a ballistic parachute practical?</p></htmltext>
<tokenext>I wonder if it is light enough to make a ballistic parachute practical ?</tokentext>
<sentencetext>I wonder if it is light enough to make a ballistic parachute practical?</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451108</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30452772</id>
	<title>Re:Yawn.</title>
	<author>A nonymous Coward</author>
	<datestamp>1260886260000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>Turbines don't have thousands of controlled explosions every second.  They don't have any.  They operate in a continuous burn.</p><p>Now maybe you are confusing turbines with the pulse jet used to power the Prussian V-1 buzz bomb of WW II.  But they didn't have the range to hit Siam.  I suppose that's where the gyrocopter comes in.</p></htmltext>
<tokenext>Turbines do n't have thousands of controlled explosions every second .
They do n't have any .
They operate in a continuous burn.Now maybe you are confusing turbines with the pulse jet used to power the Prussian V-1 buzz bomb of WW II .
But they did n't have the range to hit Siam .
I suppose that 's where the gyrocopter comes in .</tokentext>
<sentencetext>Turbines don't have thousands of controlled explosions every second.
They don't have any.
They operate in a continuous burn.Now maybe you are confusing turbines with the pulse jet used to power the Prussian V-1 buzz bomb of WW II.
But they didn't have the range to hit Siam.
I suppose that's where the gyrocopter comes in.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451100</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451118</id>
	<title>Visit the plant in Everett.</title>
	<author>Anonymous</author>
	<datestamp>1260876900000</datestamp>
	<modclass>Interestin</modclass>
	<modscore>5</modscore>
	<htmltext><p>If you've never had the chance to go, check out the <a href="http://www.futureofflight.org/" title="futureofflight.org">Future of Flight museum</a> [futureofflight.org] in Everett. It's an awe-inspiring tour of the Boeing factory where you get top-down view of the factory floor. It's the largest building in the world, with enough room to fit all of Disneyland inside. (and then you'd have 12 acres for parking)</p><p>Cars are made on assembly lines, but planes are too large to use the same techniques. <i>They do it anyway.</i></p><p>(Sorry about any munged text here;<nobr> <wbr></nobr>/. previews as one character wide, 200+ down.)</p></htmltext>
<tokenext>If you 've never had the chance to go , check out the Future of Flight museum [ futureofflight.org ] in Everett .
It 's an awe-inspiring tour of the Boeing factory where you get top-down view of the factory floor .
It 's the largest building in the world , with enough room to fit all of Disneyland inside .
( and then you 'd have 12 acres for parking ) Cars are made on assembly lines , but planes are too large to use the same techniques .
They do it anyway .
( Sorry about any munged text here ; / .
previews as one character wide , 200 + down .
)</tokentext>
<sentencetext>If you've never had the chance to go, check out the Future of Flight museum [futureofflight.org] in Everett.
It's an awe-inspiring tour of the Boeing factory where you get top-down view of the factory floor.
It's the largest building in the world, with enough room to fit all of Disneyland inside.
(and then you'd have 12 acres for parking)Cars are made on assembly lines, but planes are too large to use the same techniques.
They do it anyway.
(Sorry about any munged text here; /.
previews as one character wide, 200+ down.
)</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30452516</id>
	<title>Re:And the wings might not even fall off in flight</title>
	<author>Anonymous</author>
	<datestamp>1260884520000</datestamp>
	<modclass>Informativ</modclass>
	<modscore>1</modscore>
	<htmltext><p><div class="quote"><p>Now, there is the instance of the composite vertical stabilizer separating from the aircraft on an American Airbus A300, but that was attributed to the forces applied to it by the co-pilot and the lack of correct software control.</p></div><p>The A300 used hydraulic controls so there was no software involved. The pilot did, however, use the rudder "aggressively" according to the NTSB and whilst it thus was pilot error, American Airlines got a lot of the blame because he only did what he had been trained to do. AA's crew training didn't follow Airbus guides properly and Airbus had repeatedly expressed their concerns about it prior to the accident. The NTSB found out that crews had been trained in the simulator for situations which the simulator was not designed for and could not accurately simulate.</p></div>
	</htmltext>
<tokenext>Now , there is the instance of the composite vertical stabilizer separating from the aircraft on an American Airbus A300 , but that was attributed to the forces applied to it by the co-pilot and the lack of correct software control.The A300 used hydraulic controls so there was no software involved .
The pilot did , however , use the rudder " aggressively " according to the NTSB and whilst it thus was pilot error , American Airlines got a lot of the blame because he only did what he had been trained to do .
AA 's crew training did n't follow Airbus guides properly and Airbus had repeatedly expressed their concerns about it prior to the accident .
The NTSB found out that crews had been trained in the simulator for situations which the simulator was not designed for and could not accurately simulate .</tokentext>
<sentencetext>Now, there is the instance of the composite vertical stabilizer separating from the aircraft on an American Airbus A300, but that was attributed to the forces applied to it by the co-pilot and the lack of correct software control.The A300 used hydraulic controls so there was no software involved.
The pilot did, however, use the rudder "aggressively" according to the NTSB and whilst it thus was pilot error, American Airlines got a lot of the blame because he only did what he had been trained to do.
AA's crew training didn't follow Airbus guides properly and Airbus had repeatedly expressed their concerns about it prior to the accident.
The NTSB found out that crews had been trained in the simulator for situations which the simulator was not designed for and could not accurately simulate.
	</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451488</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451108</id>
	<title>And the wings might not even fall off in flight!</title>
	<author>jollyreaper</author>
	<datestamp>1260876900000</datestamp>
	<modclass>Flamebait</modclass>
	<modscore>-1</modscore>
	<htmltext><p>My confidence in the airframe is low.</p></htmltext>
<tokenext>My confidence in the airframe is low .</tokentext>
<sentencetext>My confidence in the airframe is low.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30459242</id>
	<title>Re:Yawn.</title>
	<author>Anonymous</author>
	<datestamp>1259689260000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext>Unfortunately these monkeys have been bred for docility by those cunning Puppeteers.</htmltext>
<tokenext>Unfortunately these monkeys have been bred for docility by those cunning Puppeteers .</tokentext>
<sentencetext>Unfortunately these monkeys have been bred for docility by those cunning Puppeteers.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30452390</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30453830</id>
	<title>Re:Yawn.</title>
	<author>AmberBlackCat</author>
	<datestamp>1260896520000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p><div class="quote"><p>...a bunch of evolved monkeys into a big steel box, fill it up with stuff that burns, cause thousands of controlled explosions every second to rotate big spin-y things and cause the contraption to soar through the air (and actually land in a controlled fashion).</p></div><p>Leave Congress out of this.</p></div>
	</htmltext>
<tokenext>...a bunch of evolved monkeys into a big steel box , fill it up with stuff that burns , cause thousands of controlled explosions every second to rotate big spin-y things and cause the contraption to soar through the air ( and actually land in a controlled fashion ) .Leave Congress out of this .</tokentext>
<sentencetext>...a bunch of evolved monkeys into a big steel box, fill it up with stuff that burns, cause thousands of controlled explosions every second to rotate big spin-y things and cause the contraption to soar through the air (and actually land in a controlled fashion).Leave Congress out of this.
	</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451100</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451812</id>
	<title>Re:ill-informed nonsense</title>
	<author>pieisgood</author>
	<datestamp>1260880320000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>Lol yeah Hawaii... where old aircraft go to die.</htmltext>
<tokenext>Lol yeah Hawaii... where old aircraft go to die .</tokentext>
<sentencetext>Lol yeah Hawaii... where old aircraft go to die.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451266</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30453890</id>
	<title>Re:Visit the plant in Everett.</title>
	<author>Anonymous</author>
	<datestamp>1260897240000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p><a href="http://www.futureofflightstore.com/" title="futureofflightstore.com" rel="nofollow">LOVE the pixel art</a> [futureofflightstore.com]</p></htmltext>
<tokenext>LOVE the pixel art [ futureofflightstore.com ]</tokentext>
<sentencetext>LOVE the pixel art [futureofflightstore.com]</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451118</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451488</id>
	<title>Re:And the wings might not even fall off in flight</title>
	<author>wjsteele</author>
	<datestamp>1260878700000</datestamp>
	<modclass>Interestin</modclass>
	<modscore>2</modscore>
	<htmltext>Actually, I can't think of a single instance of a composite wing structure failing in flight for a commercial aircraft.  Aluminum, however, has a fatigue life limit, and several planes have fallen to spar failures (Boeing 707) or cabin structure failures (De Havilland Comet).<br> <br>
Now, there is the instance of the composite vertical stabilizer separating from the aircraft on an American Airbus A300, but that was attributed to the forces applied to it by the co-pilot and the lack of correct software control.<br> <br>Bill</htmltext>
<tokenext>Actually , I ca n't think of a single instance of a composite wing structure failing in flight for a commercial aircraft .
Aluminum , however , has a fatigue life limit , and several planes have fallen to spar failures ( Boeing 707 ) or cabin structure failures ( De Havilland Comet ) .
Now , there is the instance of the composite vertical stabilizer separating from the aircraft on an American Airbus A300 , but that was attributed to the forces applied to it by the co-pilot and the lack of correct software control .
Bill</tokentext>
<sentencetext>Actually, I can't think of a single instance of a composite wing structure failing in flight for a commercial aircraft.
Aluminum, however, has a fatigue life limit, and several planes have fallen to spar failures (Boeing 707) or cabin structure failures (De Havilland Comet).
Now, there is the instance of the composite vertical stabilizer separating from the aircraft on an American Airbus A300, but that was attributed to the forces applied to it by the co-pilot and the lack of correct software control.
Bill</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451108</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30452360</id>
	<title>Re:Yawn.</title>
	<author>mr\_lizard13</author>
	<datestamp>1260883560000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>He's only an evolved monkey, he wouldn't know the difference.</htmltext>
<tokenext>He 's only an evolved monkey , he would n't know the difference .</tokentext>
<sentencetext>He's only an evolved monkey, he wouldn't know the difference.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451408</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451408</id>
	<title>Re:Yawn.</title>
	<author>Anonymous</author>
	<datestamp>1260878280000</datestamp>
	<modclass>Informativ</modclass>
	<modscore>4</modscore>
	<htmltext><blockquote><div><p>thousands of controlled explosions every second</p></div></blockquote><p>I thought jet engines produced something more like a continuous deflagration rather than periodic explosions.</p></div>
	</htmltext>
<tokenext>thousands of controlled explosions every secondI thought jet engines produced something more like a continuous deflagration rather than periodic explosions .</tokentext>
<sentencetext>thousands of controlled explosions every secondI thought jet engines produced something more like a continuous deflagration rather than periodic explosions.
	</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451100</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30453082</id>
	<title>Re:And the wings might not even fall off in flight</title>
	<author>chrisxcr1</author>
	<datestamp>1260888900000</datestamp>
	<modclass>Interestin</modclass>
	<modscore>2</modscore>
	<htmltext><p>Actually, IIRC that pilot was not trained by American Airlines to wag the rudder like a jackass. That was his own dumb idea and he'd been warned about it in the past.</p></htmltext>
<tokenext>Actually , IIRC that pilot was not trained by American Airlines to wag the rudder like a jackass .
That was his own dumb idea and he 'd been warned about it in the past .</tokentext>
<sentencetext>Actually, IIRC that pilot was not trained by American Airlines to wag the rudder like a jackass.
That was his own dumb idea and he'd been warned about it in the past.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30452516</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30452574</id>
	<title>Re:Yawn.</title>
	<author>mybecq</author>
	<datestamp>1260884880000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>I still marvel at the fact that we can scratch a bunch of tiny lines onto a chunk of sand, connect lots of other wires to it, push electrons around billions of times every second to trip lots of tiny switches and cause the contraption to accept human input and output something intelligible (and we can actually carry them around too).

And I don't even think I'm old-fashioned.</htmltext>
<tokenext>I still marvel at the fact that we can scratch a bunch of tiny lines onto a chunk of sand , connect lots of other wires to it , push electrons around billions of times every second to trip lots of tiny switches and cause the contraption to accept human input and output something intelligible ( and we can actually carry them around too ) .
And I do n't even think I 'm old-fashioned .</tokentext>
<sentencetext>I still marvel at the fact that we can scratch a bunch of tiny lines onto a chunk of sand, connect lots of other wires to it, push electrons around billions of times every second to trip lots of tiny switches and cause the contraption to accept human input and output something intelligible (and we can actually carry them around too).
And I don't even think I'm old-fashioned.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451100</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451782</id>
	<title>Evolution?</title>
	<author>Anonymous</author>
	<datestamp>1260880140000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>Like global warming, evolution is a hoax.  <a href="http://www.expelledthemovie.com/" title="expelledthemovie.com" rel="nofollow">Educate yourself.</a> [expelledthemovie.com]</p></htmltext>
<tokenext>Like global warming , evolution is a hoax .
Educate yourself .
[ expelledthemovie.com ]</tokentext>
<sentencetext>Like global warming, evolution is a hoax.
Educate yourself.
[expelledthemovie.com]</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451100</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30453194</id>
	<title>Re:And the wings might not even fall off in flight</title>
	<author>khallow</author>
	<datestamp>1260889800000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p><div class="quote"><p>My confidence in the airframe is low.</p></div><p>So what? It's only flown once. Your confidence in the airframe should be "low". Make a guess what happens between now and when the first paying customer steps aboard? Hint: they're building three planes that will never see a paying customer.</p></div>
	</htmltext>
<tokenext>My confidence in the airframe is low.So what ?
It 's only flown once .
Your confidence in the airframe should be " low " .
Make a guess what happens between now and when the first paying customer steps aboard ?
Hint : they 're building three planes that will never see a paying customer .</tokentext>
<sentencetext>My confidence in the airframe is low.So what?
It's only flown once.
Your confidence in the airframe should be "low".
Make a guess what happens between now and when the first paying customer steps aboard?
Hint: they're building three planes that will never see a paying customer.
	</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451108</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30454830</id>
	<title>Re:Yawn.</title>
	<author>mcrbids</author>
	<datestamp>1259700120000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>Old fashioned?</p><p>I'm an engineer, and a pilot. I *thoroughly* understand the forces involved. I could take a Cessna aircraft apart and identify the majority of the parts by name. I've worked on them repeatedly with an A &amp; P. (aircraft mechanic) I can name all the forces working on a plane (thrust, drag, lift, gravity) and can explain the forces that hold a plane aloft. (Venturi effect) as well as the different types of forces. (inertia, parasitic drag, etc)</p><p>But every time I jump into a plane, and taxi to take off, I'm slightly amazed when it takes off, and I'm suspended by nothing more than the energy of the engine being converted into lift by the shape of the otherwise-level wings!</p><p>Small planes (like what I pilot) are actually very simple machines, compared to (for example) a car. Their engines are designed to be as simple as possible, with as few moving parts as can be mustered, to minimize complexity and reduce failure rates. They are air-cooled. They use tie rods instead of cables. The engine's ignition system doesn't depend on the plane's electrical system, (they use magnetos, like your lawn mower) and there are two independent ignition systems so that if either fails, the other keeps the plane safely aloft. Rather than rely on complex sensors to provide optimal fuel mixtures, the mixture controls are handled manually.</p><p>And on, and on, and on.</p><p>The result is a simple machine that manages to circumnavigate a highly dangerous environment, working with a medium that is literally thin air, with a safety record that's comparable to, or better than a modern car with all its safety technology, seat belts, airbags, crash cages, and so on.</p><p>Amazing!</p></htmltext>
<tokenext>Old fashioned ? I 'm an engineer , and a pilot .
I * thoroughly * understand the forces involved .
I could take a Cessna aircraft apart and identify the majority of the parts by name .
I 've worked on them repeatedly with an A &amp; P. ( aircraft mechanic ) I can name all the forces working on a plane ( thrust , drag , lift , gravity ) and can explain the forces that hold a plane aloft .
( Venturi effect ) as well as the different types of forces .
( inertia , parasitic drag , etc ) But every time I jump into a plane , and taxi to take off , I 'm slightly amazed when it takes off , and I 'm suspended by nothing more than the energy of the engine being converted into lift by the shape of the otherwise-level wings ! Small planes ( like what I pilot ) are actually very simple machines , compared to ( for example ) a car .
Their engines are designed to be as simple as possible , with as few moving parts as can be mustered , to minimize complexity and reduce failure rates .
They are air-cooled .
They use tie rods instead of cables .
The engine 's ignition system does n't depend on the plane 's electrical system , ( they use magnetos , like your lawn mower ) and there are two independent ignition systems so that if either fails , the other keeps the plane safely aloft .
Rather than rely on complex sensors to provide optimal fuel mixtures , the mixture controls are handled manually.And on , and on , and on.The result is a simple machine that manages to circumnavigate a highly dangerous environment , working with a medium that is literally thin air , with a safety record that 's comparable to , or better than a modern car with all its safety technology , seat belts , airbags , crash cages , and so on.Amazing !</tokentext>
<sentencetext>Old fashioned?I'm an engineer, and a pilot.
I *thoroughly* understand the forces involved.
I could take a Cessna aircraft apart and identify the majority of the parts by name.
I've worked on them repeatedly with an A &amp; P. (aircraft mechanic) I can name all the forces working on a plane (thrust, drag, lift, gravity) and can explain the forces that hold a plane aloft.
(Venturi effect) as well as the different types of forces.
(inertia, parasitic drag, etc)But every time I jump into a plane, and taxi to take off, I'm slightly amazed when it takes off, and I'm suspended by nothing more than the energy of the engine being converted into lift by the shape of the otherwise-level wings!Small planes (like what I pilot) are actually very simple machines, compared to (for example) a car.
Their engines are designed to be as simple as possible, with as few moving parts as can be mustered, to minimize complexity and reduce failure rates.
They are air-cooled.
They use tie rods instead of cables.
The engine's ignition system doesn't depend on the plane's electrical system, (they use magnetos, like your lawn mower) and there are two independent ignition systems so that if either fails, the other keeps the plane safely aloft.
Rather than rely on complex sensors to provide optimal fuel mixtures, the mixture controls are handled manually.And on, and on, and on.The result is a simple machine that manages to circumnavigate a highly dangerous environment, working with a medium that is literally thin air, with a safety record that's comparable to, or better than a modern car with all its safety technology, seat belts, airbags, crash cages, and so on.Amazing!</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451100</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451666</id>
	<title>Re:Yawn.</title>
	<author>Noose For A Neck</author>
	<datestamp>1260879540000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>Given that this is a jet and not a piston-powered aircraft, that would be "one continuous controlled flame". No explosions involved, sorry.</htmltext>
<tokenext>Given that this is a jet and not a piston-powered aircraft , that would be " one continuous controlled flame " .
No explosions involved , sorry .</tokentext>
<sentencetext>Given that this is a jet and not a piston-powered aircraft, that would be "one continuous controlled flame".
No explosions involved, sorry.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451100</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30456120</id>
	<title>Re:And the wings might not even fall off in flight</title>
	<author>MtViewGuy</author>
	<datestamp>1259673300000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>The problems with the Comet I came from the fact the airframe developed cracks around the squared off windows, which caused serious metal fatigue problems, especially given the pressure differential from inside the cabin to the higher altitudes that the Comet I was flying in. That's why the Comet 4 switched to rounded off windows, which eliminated this very specific metal fatigue problem (that's why the passenger windows on all subsequent jet airliners have rounded shapes).</p></htmltext>
<tokenext>The problems with the Comet I came from the fact the airframe developed cracks around the squared off windows , which caused serious metal fatigue problems , especially given the pressure differential from inside the cabin to the higher altitudes that the Comet I was flying in .
That 's why the Comet 4 switched to rounded off windows , which eliminated this very specific metal fatigue problem ( that 's why the passenger windows on all subsequent jet airliners have rounded shapes ) .</tokentext>
<sentencetext>The problems with the Comet I came from the fact the airframe developed cracks around the squared off windows, which caused serious metal fatigue problems, especially given the pressure differential from inside the cabin to the higher altitudes that the Comet I was flying in.
That's why the Comet 4 switched to rounded off windows, which eliminated this very specific metal fatigue problem (that's why the passenger windows on all subsequent jet airliners have rounded shapes).</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451488</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30456794</id>
	<title>Re:Yawn.</title>
	<author>drinkypoo</author>
	<datestamp>1259678580000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p><div class="quote"><p>and can explain the forces that hold a plane aloft. (Venturi effect)</p> </div><p>don't get too cocky, the jury is still out on the <a href="http://en.wikipedia.org/wiki/Coand\%C4\%83\_effect" title="wikipedia.org">Coanda effect</a> [wikipedia.org]. Maybe we could cross a bird with a human, get them a PHd in physics, and ask <em>them</em>.</p></div>
	</htmltext>
<tokenext>and can explain the forces that hold a plane aloft .
( Venturi effect ) do n't get too cocky , the jury is still out on the Coanda effect [ wikipedia.org ] .
Maybe we could cross a bird with a human , get them a PHd in physics , and ask them .</tokentext>
<sentencetext>and can explain the forces that hold a plane aloft.
(Venturi effect) don't get too cocky, the jury is still out on the Coanda effect [wikipedia.org].
Maybe we could cross a bird with a human, get them a PHd in physics, and ask them.
	</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30454830</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451354</id>
	<title>Re:And the wings might not even fall off in flight</title>
	<author>OverlordQ</author>
	<datestamp>1260878040000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>It has to exceed design load before the FAA will even let it fly, it's passed the design load, and they're expecting to test to ultimate load in the spring.</p></htmltext>
<tokenext>It has to exceed design load before the FAA will even let it fly , it 's passed the design load , and they 're expecting to test to ultimate load in the spring .</tokentext>
<sentencetext>It has to exceed design load before the FAA will even let it fly, it's passed the design load, and they're expecting to test to ultimate load in the spring.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451108</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30452418</id>
	<title>Re:ill-informed nonsense</title>
	<author>Anonymous</author>
	<datestamp>1260883920000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>Smartypants, what happens to graphite when it FAILS?</p><p>I'll take 'bendy' over "shattery and splintery" any day.</p></htmltext>
<tokenext>Smartypants , what happens to graphite when it FAILS ? I 'll take 'bendy ' over " shattery and splintery " any day .</tokentext>
<sentencetext>Smartypants, what happens to graphite when it FAILS?I'll take 'bendy' over "shattery and splintery" any day.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451266</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451266</id>
	<title>ill-informed nonsense</title>
	<author>Anonymous</author>
	<datestamp>1260877680000</datestamp>
	<modclass>Informativ</modclass>
	<modscore>5</modscore>
	<htmltext><p>Compared to an aluminum airframe?  Are you kidding?</p><p>Aluminum has zero stress endurance limit.  That means that it WILL crack eventually.</p><p>And why don't you ask Hawaii Airlines about corrosion problems with aluminum?</p><p>Composites are much more reliable and have much lower maintenance costs.</p><p>There are a lot of composite parts in the triple 7 and they are well documented to be more reliable than the aluminum ones in the 767.</p></htmltext>
<tokenext>Compared to an aluminum airframe ?
Are you kidding ? Aluminum has zero stress endurance limit .
That means that it WILL crack eventually.And why do n't you ask Hawaii Airlines about corrosion problems with aluminum ? Composites are much more reliable and have much lower maintenance costs.There are a lot of composite parts in the triple 7 and they are well documented to be more reliable than the aluminum ones in the 767 .</tokentext>
<sentencetext>Compared to an aluminum airframe?
Are you kidding?Aluminum has zero stress endurance limit.
That means that it WILL crack eventually.And why don't you ask Hawaii Airlines about corrosion problems with aluminum?Composites are much more reliable and have much lower maintenance costs.There are a lot of composite parts in the triple 7 and they are well documented to be more reliable than the aluminum ones in the 767.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451108</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451850</id>
	<title>Re:And the wings might not even fall off in flight</title>
	<author>sexconker</author>
	<datestamp>1260880500000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p><div class="quote"><p>It has to exceed design load before the FAA will even let it fly, it's passed the design load, and they're expecting to test to <b>ultimate load</b> in the spring.</p></div><p>Careful.<br>I think there's already a movie named that.</p></div>
	</htmltext>
<tokenext>It has to exceed design load before the FAA will even let it fly , it 's passed the design load , and they 're expecting to test to ultimate load in the spring.Careful.I think there 's already a movie named that .</tokentext>
<sentencetext>It has to exceed design load before the FAA will even let it fly, it's passed the design load, and they're expecting to test to ultimate load in the spring.Careful.I think there's already a movie named that.
	</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451354</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30452950</id>
	<title>Re:ill-informed nonsense</title>
	<author>Anonymous</author>
	<datestamp>1260887640000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>the 767 is made from 50\% aluminum afaik. does this mean that it will last shorter than the 787?</p><p>you can see cracks in metal, you can't do that with carbon-fibers.</p></htmltext>
<tokenext>the 767 is made from 50 \ % aluminum afaik .
does this mean that it will last shorter than the 787 ? you can see cracks in metal , you ca n't do that with carbon-fibers .</tokentext>
<sentencetext>the 767 is made from 50\% aluminum afaik.
does this mean that it will last shorter than the 787?you can see cracks in metal, you can't do that with carbon-fibers.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_15_226239.30451266</parent>
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