Skill's weekend teaser

This is a discussion on Skill's weekend teaser within the General Trading Chat forums, part of the Reception category; Originally Posted by Skill Leverage TheBramble that's a bit of a vague statement; are you saying it couldn't take off ...

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, 1:29pm   #21
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Quote:
Originally Posted by Skill Leverage View Post
TheBramble that's a bit of a vague statement; are you saying it couldn't take off either?
Vague? It's on a conveyor which has the property of infinite virtual length (or it's not a conveyor) and standard runway usable length (as per your definition).

To generate the life necessary for takeoff the 747 needs an airspeed of 180mph (fully laden cargo & fuel). It generates that lift by having the engines push what they're attached to (the plane) until there is sufficient pressure differential between upper and lower edges of wings to lift the swine skywards.

Unless there's some deeply serious or humorous twist to your teaser, it ain't going anywhere if the conveyor speed is perfectly matched to the relative ground speed generated by the engines. Until it runs out of fuel that is - at which point it will begionn to move somewhat differently....
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Old Feb 22, 2009, 1:31pm   #22
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Originally Posted by Aspire View Post
Ah... The plane moves relative to the air, not the runway, so the conveyor won't be able to slow the plane down, just make it's wheels spin super fast.. so the plane takes off normally.
Uh? Yes. And therefore no.

There IS no airpseed if the conveyor is moving at the same speed as the wheels.
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Old Feb 22, 2009, 1:37pm   #23
 
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Quote:
Originally Posted by Aspire View Post
Not the fact that the plane is driven by it's engines thrust rather than the speed of it's wheels then.... Well, I'm stumped.
Think about why planes have wings !, and why gliders (that dont have engines) can fly
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Old Feb 22, 2009, 1:40pm   #24
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If the plane is moving forward at 180mph, then the conveyor is moving back at 180mph.

But the conveyor doesn't put any force on the plane because all teh wheels do is hold the plane up. The plane moves morward by pushing itself forward against the air, not the runway. So all the conveyor does is make the wheels spin like it's going at 360mph and the plane takes off normaly
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Old Feb 22, 2009, 1:47pm   #25
 
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Skill Leverage started this thread
Quote:
Originally Posted by TheBramble View Post
Vague? It's on a conveyor which has the property of infinite virtual length (or it's not a conveyor) and standard runway usable length (as per your definition).

To generate the life necessary for takeoff the 747 needs an airspeed of 180mph (fully laden cargo & fuel). It generates that lift by having the engines push what they're attached to (the plane) until there is sufficient pressure differential between upper and lower edges of wings to lift the swine skywards.

Unless there's some deeply serious or humorous twist to your teaser, it ain't going anywhere if the conveyor speed is perfectly matched to the relative ground speed generated by the engines. Until it runs out of fuel that is - at which point it will begionn to move somewhat differently....
Congratulations - you managed to make a completely incorrect answer look vaguely intelligent.
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Old Feb 22, 2009, 1:48pm   #26
 
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Skill Leverage started this thread Bramble let me ask you this; if a plane's wheels stop spinning when it's in the sky, does it crash?
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Thanks! The following members like this post: zupcon
Old Feb 22, 2009, 1:54pm   #27
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Instead of the engines pushing the plane through the air, they are pulling the air over the wings. Quid pro quo.

(Note, I answered before I thought about it and am one of the imbeciles that got it wrong).
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Old Feb 22, 2009, 1:57pm   #28
 
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Skill Leverage started this thread That never looks right without 'Clarice' at the end
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Old Feb 22, 2009, 1:59pm   #29
 
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it's worth pointing out here that it can't work in theory as the conveyer belt would have to move at an infinite speed...
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Old Feb 22, 2009, 2:02pm   #30
 
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Plane will remain stationary.
Isn't moving relative to the air.
That's it.
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