Answer to the aeroplane problem on Facebook

**trog** · 27th April 2018, 07:09 PM

But what if the conveyor and plane are facing a cyclonic scale headwind ?

**bee utey** · 27th April 2018, 07:23 PM

Most importantly, the plane can't take off if it hasn't paid the airport tax.

DiscoMick · 27th April 2018, 09:12 PM

Also, has it been cleared by air traffic control?

**superquag** · 27th April 2018, 09:14 PM

Sigh... welcome to the 'real'world of aviation.... Nothing gets off the ground until ALL the paperwork etc is done. Correctly.

**superquag** · 27th April 2018, 09:18 PM

Originally Posted by Mick_Marsh

Read the question again. You have changed the question. The conveyor is moving at the same speed as the wheels, not the plane.

My error. That was a partial quote from the link posted. Anyway, this "problem" has been floating around for yonks, since last Century from memory. - Never quite satisfied myself with the answer - until I gained my Wings a few years ago.
(Spending the kids' inheritance

)

Nevertheless, the 'plane takes off... with red-hot wheel bearings.

**Mick_Marsh** · 28th April 2018, 08:23 AM

What if the plane is a Harrier?

All extra assumed detail added to the question to make it solvable. That fails to answer the original question.

**austastar** · 28th April 2018, 08:29 AM

Hi,
Just rethink the problem to a real world scenario.
A float plane taking off against a current, and it all works.
Cheers

**Eevo** · 28th April 2018, 08:34 AM

Originally Posted by austastar

Hi,
Just rethink the problem to a real world scenario.
A float plane taking off against a current, and it all works.
Cheers

the question is not a real world problem.

**austastar** · 28th April 2018, 08:36 AM

Originally Posted by Eevo

the question is not a real world problem.

True!

**Dorian** · 28th April 2018, 09:27 AM

Originally Posted by Slunnie

I love this, it's gold. What do you think? I think it wont lift off but it can.

It's more of a trap than it looks. "The conveyor belt is designed to exactly match the speed of the wheels, moving in the opposite direction" .

Which speed is it matching? the forward speed of the whole wheel or the speed of the part of the wheel that is in contact with the ground or the speed of the top of the wheel.

If it's matching the whole wheel, then the wheel will just spin twice as fast and the plane will take off as normal, the conveyor will be running backwards at the same speed of the whole wheel / plane is moving forward.

If it's matching the speed of the wheel that's in contact with the conveyor then the conveyor is stationary, because just as when the plane takes off on a normal runway the rubber in contact with the tarmac is stationary. Unless you have installed ATB's which we all know need slippage to work.

If it's matching the speed of the top of the wheel then it will quickly reach infinite speed, as the conveyor can never go twice the speed as itself is going.

Otherwise I'll refer you to my previous post.

Cheers Glen.

Thread: Answer to the aeroplane problem on Facebook

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