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Old 23 November 2007, 20:29   #61
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A good bevvy tonight was it, Andy?
Yeh, my spelling actually gets better
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Old 24 November 2007, 06:30   #62
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Oh this could run and run,
Wait till we get into boundary layers surface friction inertia and the like.
But personally I stand by the second post on this thread, it's a wheel bearing issue.
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Old 26 November 2007, 16:44   #63
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OK OK, I smacked my forehead twice.
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Old 26 November 2007, 16:51   #64
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So now to the situation where a plane wants to encounter enough headwind to get a lift off, but where it stays at the same spot. Either because it is placed on a reverse moving belt or because the rear of the plane is attached to an anchor. No matter how much motorpower you use, the minimum of headwind is not reached as you stay at the same spot. And without a minimum of headwind no lift off.

Motorpower gives no headwind, speed does.

So the anwer is: no.

My €0,01
But in this scenario, the plane will not be stationary. It will be moving forward along the conveyor belt at its normal takeoff velocity.

So it will fly.
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Old 26 November 2007, 17:01   #65
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But in this scenario, the plane will not be stationary. It will be moving forward along the conveyor belt at its normal takeoff velocity.

So it will fly.
Yes so right. I removed my elaborate reasoning why it would not fly after discovering that the topic had already two pages wheron the second one was the clear explanation why the plane would fly. I thought to be smart to quickly delete my own reasoning why the plane would NOT fly , but I was not swift enough I discovered
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Old 26 November 2007, 17:04   #66
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Yes so right. I removed my elaborate reasoning why it would not fly after discovering that the topic had already two pages wheron the second one was the clear explanation why the plane would fly. I thought to be smart to quickly delete my own reasoning why the plane would NOT fly , but I was not swift enough I discovered
It took me a while to understand that it would fly too.
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Old 27 November 2007, 02:49   #67
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The question is impossible to answer correctly because it is impossible to have the conveyor locked to the same speed of the aircraft and not break the rules of the question. If with no conveyor the plane was moving forward at 100mph, you then put a conveyor under it moving backward at 100mph, the plane would come to halt relative to the ground. And if the plane has zero forward speed over the ground, then the question says the conveyor must have the same speed which is also zero. Therefore, for the plane to take off you have to break the rules of the question which means the question is unanswerable. Its a trick question.
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Old 27 November 2007, 04:34   #68
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the plane would come to halt relative to the ground.
why
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Old 27 November 2007, 04:42   #69
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Oops, I didn't consider the rotational speed of the wheels doubling.
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Old 27 November 2007, 05:02   #70
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Most people are missing the point that almost all aircraft have free spinning wheels. In this case, ground(conveyor ) speed and air speed are not relative
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