Skill's weekend teaser

This is a discussion on Skill's weekend teaser within the General Trading Chat forums, part of the T2W Archive category; Ok. The Conveyor moves at the same speed as the planes wheels. They both start stationary, then the plane starts ...

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, 11:44am   #15
Joined Apr 2008
Ok.

The Conveyor moves at the same speed as the planes wheels.

They both start stationary, then the plane starts its engines. To begin with the conveyor is stationary because the planes wheels are stationary so the thrust of the engines pushes the plane forward.

The conveyor then reacts and goes the other way, slowing the plane down but before it can stop it completely the speed of the plane and hence it's wheels has dropped and so the conveyor slows down too.

This then allows the plane's engines to thrust it forward again. The planes speeds up - the conveyor speeds up - the plane slows down etc etc.

So I reckon how the plane moves depends on how quickly it accelerates and how quickly the conveyor accelerates and reacts but in short the plane will move forward but the conveyor's reactions will stop it taking off before the end of the runway.

That's my take on it anyway.
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Old Feb 22, 2009, 11:46am   #16
 
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Skill Leverage started this thread You're forgetting something about the mechanics of the aircraft, which is something 90% of people do at first, so you're in good company.
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Old Feb 22, 2009, 11:49am   #17
 
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Skill Leverage started this thread You touch on it exactly in your explanation, but you miss its purpose. I won't highlight it just yet, but think about how a plane is able to fly and then look at the problem again.
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Old Feb 22, 2009, 11:57am   #18
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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.
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Old Feb 22, 2009, 11:59am   #19
 
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Skill Leverage started this thread Well that's exactly the point. So why would it run out of runway?
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Old Feb 22, 2009, 12:01pm   #20
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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.
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Thanks! The following members like this post: Skill Leverage
Old Feb 22, 2009, 12:29pm   #21
Joined Jul 2003
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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