Process West Cooler Or Pwr?

[ratter]

plane needs air speed over it's wings to lift

[AzMahoony]

Arghhh this does my head in

[Rab]

Pilot would need to not want it to take off for it not to - if he wanted to take off it will

(only way it wont move on the treadmill and take off is if he tries to keep it still - light throttle only)

depends if the treadmill is black or silver

edit: I have knowledge of these things: I have been in a plane and have used a treadmill

Edited 10/07/14 12:44 AM by Rab

[MattyP]

Damn it mick you got me started

Even accounting for friction in the wheel bearings the engines would need to work at most 5-10% harder to account for the friction.

The easiest way to explain this is imagine you've got a skate board on a treadmill and your holding on to the handrails. How hard do you have to hold the handrails at 5km/hr, let's say 10, now let's say 20 and you'll find the force required is almost the same.

The same principle applies here.

The engines would have to work marginally harder to account for this extra source of friction but not anywhere near the maximum amount of force the engines can apply to the plane.

If the propulsion was from the wheels to get it moving like a car then yes it would go flying backwards but because it's engines work on the air around it then the plane will take off comfortably.

[Rab]

Still needs to move relative to the ground to get lift.

Only the pilot can stop that from happening - not the treadmill operator

[MattyP]

But the treadmill doesn't effect it in a frictionless environment it'll sit there and just let the wheels spin.

The friction in the bearings is a constant. It doesn't increase exponentially as most people seem to think. The treadmill operator can have it operating as fast as he wants. The pilot only has to give 5-10% to counteract the friction caused by the treadmill

[Buf-Phoon]

If the propulsion was from the wheels to get it moving like a car then yes it would go flying backwards but because it's engines work on the air around it then the plane will take off comfortably.

Why would it go speeding in reverse ? farkin

[MattyP]

Btw that plane question is without a doubt the most hated physics question of all time because it doesn't matter how many times it's been answered people still ask it and argue that it won't take off.

[MattyP]

Because the wheels in a car aren't the same as wheels in a airplane

In a airplane they are just attached. A free spinning bearing

In A MOTOR car They Are ATTACHED To A driveline that changes what The wheels actually do

If you were to slip it in neutral you'd have the same situation as the skateboard on a treadmill. The only difference is it would need to be attached by a rope to an anchor

[Buf-Phoon]

I want to know how it goes in reverse? a new thesis required for us numpties

flying skateboards what will they think of next FFS

Edited 10/07/14 01:03 AM by Buf-Phoon