Can the airplane take off?

# Thread: Can the airplane take off?

1. ## Can the airplane take off?

You have an airplane on a conveyor belt - when the airplane moves forward, the conveyor matches its speed in reverse. Can the airplane take off?

2. Yes... however I'll keep my reasoning to myself for now...

3. Originally Posted by Warhawk
You have an airplane on a conveyor belt - when the airplane moves forward, the conveyor matches its speed in reverse. Can the airplane take off?

4. Weird.

5. The wheels just spin twice as fast.

6. How wide is the conveyor?

7. Originally Posted by Warhawk
You have an airplane on a conveyor belt - when the airplane moves forward, the conveyor matches its speed in reverse. Can the airplane take off?
If the plane is moving at a speed where the wings create enough lift, it will take off....wheel speed should have no effect.

8. Originally Posted by CHIA
If the plane is moving at a speed where the wings create enough lift, it will take off....wheel speed should have no effect.
The plane would have to be moving at that speed relative to the ground. If the wheels did not spin twice as fast, the plane wouldn't be moving relative the ground at all, and there would be no lift.

9. Does not matter what the treadmill speed is because the wheel will match it. Stop thinking about plane vs treadmill as in the same way car vs treadmill.

Its prop versus 'air'. The prop is driving the plane forward because of forward propulsion against the air and not the ground.

10. But the wheels will spin twice as fast because the thrust, be it from the prop or a jet engine will push the aircraft forward. The energy from the conveyor belt merely spins the wheels.

11. Originally Posted by cjlf
Does not matter what the treadmill speed is because the wheel will match it. Stop thinking about plane vs treadmill as in the same way car vs treadmill.

Its prop versus 'air'. The prop is driving the plane forward because of forward propulsion against the air and not the ground.
Yup, that's the ticket.

The wheels and the speed they are going in any direction means nothing, as long as they remain free of friction.

The plane would take off on an ice rink just the same, maybe that's a better way to look at it.

12. So what if that same plane is in the middle of the forest on a treadmill with a mime flying it and it crashes, would it make a sound? Think about it.

13. wow. I've seen this question a bunch of times before, but this is the fastest I've ever seen a consensus form about the correct answer. I agree with what's been said btw. I guess that just means the people on BCSB aren't morons! haha

14. Originally Posted by kerunt
The plane would have to be moving at that speed relative to the ground. If the wheels did not spin twice as fast, the plane wouldn't be moving relative the ground at all, and there would be no lift.

Airspeed vs ground speed...... A plane can be in the air but have zero ground speed.

15. Originally Posted by Sky
Airspeed vs ground speed...... A plane can be in the air but have zero ground speed.
True, but that is a very dangerous situation. You always have to be wary of wind shear.

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