Skill's weekend teaser

This is a discussion on Skill's weekend teaser within the General Trading Chat forums, part of the Reception category; Airplane on a Treadmill Definitive Analysis fo sho...

View Poll Results: What will happen?
The plane will take off normally 25 40.32%
The plane will remain stationary 32 51.61%
The plane will run out of conveyor belt before it can take off 5 8.06%
Voters: 62. You may not vote on this poll

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Old Feb 22, 2009, 4:49pm   #151
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Airplane on a Treadmill Definitive Analysis

fo sho
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Old Feb 22, 2009, 4:50pm   #152
 
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Quote:
Originally Posted by TheBramble View Post
I don't understand how I can ask (multiple times) if my reasoning that the relative ground speed is 0 mph can go so magnificently unanswered.

If my rationale is wrong in that department then my reasoning which follows from that on airspeed also potentially falters and I'll be prepared, subject to a sensible refutation of that rationale, to review my thinking.
And we have answered (multiple times) and it's not going into your thick ruddy head:

GROUNDSPEED DOES NOT MAKE A PLANE FLY.
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Old Feb 22, 2009, 4:51pm   #153
 
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Quote:
Originally Posted by fifty2aces View Post
For the disbeliever(s):

If it was somehow possible to make the wheels spin backwards while the plane was flying, would it fall out of the sky?
again Bramble, do you see how people keep saying things on similar lines to me? What do you think that means? A consensus against your opinion...hmm...could it be...no...are you wrong?
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Old Feb 22, 2009, 4:51pm   #154
 
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who gives flying f***k about trading thi is far more fun. got any more teasers skill ??
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Old Feb 22, 2009, 4:52pm   #155
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Quote:
Originally Posted by TheBramble View Post
I don't understand how I can ask (multiple times) if my reasoning that the relative ground speed is 0 mph can go so magnificently unanswered.

If my rationale is wrong in that department then my reasoning which follows from that on airspeed also potentially falters and I'll be prepared, subject to a sensible refutation of that rationale, to review my thinking.
While the engines are off, the plane has a relative groundspeed of 0. When the engines are turned on, they pull the plane through the air, giving it a +ve velocity relative to both the air and the ground.

Last edited by MrGecko; Feb 22, 2009 at 4:54pm. Reason: semantics
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Old Feb 22, 2009, 4:54pm   #156
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Just got some more popcorn, can't wait to see it when these two snap.
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Old Feb 22, 2009, 4:54pm   #157
 
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Want it explained in German ?? Might be clearer ja ja ja
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Old Feb 22, 2009, 4:55pm   #158
 
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Originally Posted by KillPhil08 View Post
Just got some more popcorn, can't wait to see it when these two snap.
Skill snapped an hour or two ago
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Old Feb 22, 2009, 4:55pm   #159
 
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Skill Leverage started this thread you are not understanding the fact that while the belt is spinning away, the plane is sitting still, because the movement of the belt is translated into rotational speed of the plane's wheels, NOT movement of the plane itself.

The net force on the plane is zero AT ALL TIMES, unless the engine is switched on. Then, it takes off.
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Old Feb 22, 2009, 4:57pm   #160
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Originally Posted by Skill Leverage View Post
And we have answered (multiple times) and it's not going into your thick ruddy head:

GROUNDSPEED DOES NOT MAKE A PLANE FLY.
Matey, read what I posted again. I am using the relationship of groundspeed and airspeed as a pivotal point of my rationale.

What is the relative groundspeed of the plane at any time with its engine on, off or that inbetween bit? Given the setup as you describe with conveyor speed PERFECTLY MATCHED to the rotation of the wheels which just happen to be slung under the plane, what is the relative groundspeed of the plane for any given speed of the conveyor?

Thanks mate. Much appreciated if you could answer this one without resort to cars, brakes or anything else you've absent-mindedly skittered over to in previous attempts to answer what is after all a fairly simple question.
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