conveyor belt and plane answered at last ??

[securespark]

For the first time in my life, I find myself agreeing with joe. It's scary, but I do!

Still, stranger thins have happened, like Clegg leaping into bed with Cameron, but that's another thread....

The wheels are freespinning. The engines act on the plane, not the wheels, hence the plane will take off.

The wheels are however, rotating twice as fast as they would normally.

 

[UriBentMySpoon]

If the thrust is on a test bed - where does the thrust energy go? Why are test beds massive concrete structures weighing a hundred tonnes or more?

But this plane isn't its it? It's on freely moving wheels. So tell me Uri - what is stopping the engines moving through the air?

The forward motion is counteracted by the reverse motion of the conveyor belt. No forward motion, no air movement, no lift. Thrust does not equate lift.

 

[UriBentMySpoon]

For the first time in my life, I find myself agreeing with joe. It's scary, but I do!

Still, stranger thins have happened, like Clegg leaping into bed with Cameron, but that's another thread....

The wheels are freespinning. The engines act on the plane, not the wheels, hence the plane will take off.

The wheels are however, rotating twice as fast as they would normally.

Lift is generated by the difference in air pressure, for there to be a difference the plane has to move throught the air, if the belt negates forward movement equally then there is no pressure created, no lift.

 

[pred]

Mr Uri, for arguments sake lets assume the aircraft's engines are all turning over at 100% the wheels are spinning like the clappers the belt is flying round at nigh on the speed of sound, so far so good, lets double the speed of the belt what happens?? does the aircraft travel backwards OR do the wheels spin faster to compensate??

 

[joe-90]

If the thrust is on a test bed - where does the thrust energy go? Why are test beds massive concrete structures weighing a hundred tonnes or more?

But this plane isn't its it? It's on freely moving wheels. So tell me Uri - what is stopping the engines moving through the air?

The forward motion is counteracted by the reverse motion of the conveyor belt. No forward motion, no air movement, no lift. Thrust does not equate lift.

But it isn't. The wheels are free moving, free wheeling and can exert no influence whatsoever on the forward motion of the engines. Gedditt yet?

 

[securespark]

The belt does not negate forward movement when the thrust of the plane's engines are brought into the equation.

 

[doitall]

Mr Uri, for arguments sake lets assume the aircraft's engines are all turning over at 100% the wheels are spinning like the clappers the belt is flying round at nigh on the speed of sound, so far so good, lets double the speed of the belt what happens?? does the aircraft travel backwards OR do the wheels spin faster to compensate??

pred, If you stand the plane on a conveyor belt with the engine off, will the plane travel with the belt, and will the wheels turn.

 

[doitall]

The belt does not negate forward movement when the thrust of the plane's engines are brought into the equation.

Quite right it doesn't, I agree 100%

The problem is the wheels are going twice as fast, as the conveyor and the plane for that matter.

This conveyor belt has a control system that tracks the aircraft's wheels speed and tunes the speed of the conveyor belt to be exactly the same as the wheels, but in the opposite direction.

 

[joe-90]

Stop posting that flawed question FFS - I posted the REAL question.

 

[joe-90]

"A plane is standing on a large treadmill or conveyor belt. The plane moves in one direction, while the conveyor moves in the opposite direction. This conveyor has a control system that tracks the plane speed and tunes the speed of the conveyor to be exactly the same (but in the opposite direction). Can the plane take off?"


THIS IS THE QUESTION. THE OTHER ONE MAKES NO SENSE.

 

[doitall]

But that is a different question Joe and therefore off-topic.

If you want to make a new set of rules start your own thread.

 

[joe-90]

"A plane is standing on a large treadmill or conveyor belt. The plane moves in one direction, while the conveyor moves in the opposite direction. This conveyor has a control system that tracks the plane speed and tunes the speed of the conveyor to be exactly the same (but in the opposite direction). Can the plane take off?"


THIS IS THE QUESTION. THE OTHER ONE MAKES NO SENSE.

 

[doitall]

Tough, the question is the only one valid in the thread.

 

[joe-90]

"A plane is standing on a large treadmill or conveyor belt. The plane moves in one direction, while the conveyor moves in the opposite direction. This conveyor has a control system that tracks the plane speed and tunes the speed of the conveyor to be exactly the same (but in the opposite direction). Can the plane take off?"


THIS IS THE QUESTION. THE OTHER ONE MAKES NO SENSE.

 

[Deleted member 63160]

The problem is the wheels are going twice as fast, as the conveyor and the plane for that matter.

So the wheels are going twice as fast as the plane they are connected to.
They are also going twice as fast as the conveyor. The speed diff between the plane and conveyor is 170 knots though. Doesn't really add up.