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Title: Brainteaser: There's an airplane on the runway..
Source: Elsewhere
URL Source: http://www.someplaceelse.com
Published: Dec 1, 2005
Author: I have no idea
Post Date: 2005-12-01 01:10:02 by Jhoffa_
Keywords: Brainteaser:, airplane, runway..
Views: 2336
Comments: 202

Imagine a plane is sat on the beginning of a massive conveyor belt/travelator type arrangement, as wide and as long as a runway, and intends to take off. The conveyer belt is designed to exactly match the speed of the wheels at any given time, moving in the opposite direction of rotation. There is no wind.

Can the plane take off?

Post Comment   Private Reply   Ignore Thread  

Begin Trace Mode for Comment # 103.

#101. To: All (#0)

Interestingly, the place I first saw this question posted did not have a answer. Actually, that's part of the reason I posted it... because there was such a debate over it.

IMO, Yes.. The plane will fly.

As markm0722 pointed out above, it's generating thrust.

If you make 100,000lbs of thrust, where does it go? You can't destroy it, that's impossible.

You're not expending it on the runway, because the wheels don't drive. You're not burning it up with friction, either.. as that's not mentioned. Perfect hypotheticals here.

It's obviously going into forward motion. The wheels rotating (forcing the conveyor to match speed) is proof that the plane is indeed moving forward and regardless of what the conveyor is doing.

Jhoffa_  posted on  2005-12-02   7:20:27 ET  Reply   Untrace   Trace   Private Reply  

The wheels rotating (forcing the conveyor to match speed) is proof that the plane is indeed moving forward and regardless of what the conveyor is doing.

The wheels rotating (forcing the conveyor to match speed) is proof that the plane is indeed transferring engine thrust to the conveyor belt while the plane remains stationary. Forward movement in a jet on the ground is created by friction between the ground and the tires. Remove that friction and no forward movement.

Again, jet planes DO NOT have rocket engines. High bypass turbofans DO NOT behave like rocket engines.

wbales  posted on  2005-12-02   8:18:59 ET  Reply   Untrace   Trace   Private Reply  

#104. To: wbales (#103)

Again, jet planes DO NOT have rocket engines. High bypass turbofans DO NOT behave like rocket engines.

But it could be a window fan, so far as that goes.

It's making thrust, that's all that matters.

Jhoffa_  posted on  2005-12-02 08:25:04 ET  Reply   Untrace   Trace   Private Reply  

Forward movement in a jet on the ground is created by friction between the ground and the tires.

No it isn't, it is created by thrust from the jets. There are no drive motors for the wheels.

Dakmar  posted on  2005-12-02 08:29:52 ET  Reply   Untrace   Trace   Private Reply  

Forward movement in a jet on the ground is created by friction between the ground and the tires.

Forward movement in a jet on the ground is impeded by friction between the ground and the tires.

I does not matter in the least whether the craft in question is a jet turbine, a turbofan, a pulse jet or a rocket. Wheels or skids or any other gear that serve to support an aircraft while it approaches takeoff speed only burn up energy or momentum. They do not transmit it.

They ain't no driveshaft on a 777.

randge  posted on  2005-12-02 08:34:33 ET  Reply   Untrace   Trace   Private Reply  

The wheels rotating (forcing the conveyor to match speed) is proof that the plane is indeed transferring engine thrust to the conveyor belt while the plane remains stationary.

No it's not and no it doesn't.

I can't believe I got sucked into this again.

wakeup  posted on  2005-12-02 19:50:59 ET  Reply   Untrace   Trace   Private Reply  

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