Physics Puzzle

[Balenza]

Diyitall wrote

More of a clue than you that is quite obvious.

Fraid not.

A plane needs a land speed to take off, 2400 rpm and 85 knots and I'm flying, assuming the elevator, ailerons, rudder are where they should be and you trim for the take off position.

Yep and the airplane sitting on a controlled conveyor will not prevent this land speed from happening.

However the conveyor is preventing forward movement so no air flow over the wings

The conveyor is not preventing forward movement. Spacecat explained this quite clearly early on in the thread.
Which part don't you understand ?.

And you say you have a pilots licence. OOh dear.

 

[Balenza]

Diyitall wrote

So the plane is running on the spot.

You still don't get it.

Unless the wheels go faster than the belt they're stood on there can be no forward movement.

I get it. You've been on the pop again.

and your jet pack theory is sound except the legs would not be in contact with the belt

I think their is hope for you.

 

[doitall]

This is getting silly. Xerxes gave us the answer many posts back. The plane is driven by its engines, not its wheels. The only effect of the conveyor belt will be to increase the drag of the wheels and so the pilot will need a little more thrust than usual.

There is however one paradox in the original question:

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

As the conveyor speeds up to match the wheel speed as stated, the wheels go even faster. This is a runaway runway! If you try to do this the wheels will eventually disintegrate but, unless a piece of wheel smashes into an engine, the plane will take off anyway.

Or you run out of more power.

The plane will not take off.

 

[WDIK]

I tried I really did

I tried explaining about this web site and this question I really did

apparently I wont be allowed in Tesco's again

 

[Balenza]

Diyitall wrote

The plane will not take off.

No sh@it.
Never ceases to amaze me just how thick some people can be.

 

[Softus]

To the 'Moderator' who's been editing my posts:-

Well done. That's really very funny and very clever, and not at all cowardly.

No, really. I really really mean it. Excellent work. You should be promoted.

 

[crockett]

Oh ok I see it now. The conveyors opposing force has no bearing on the forward thrust of the planes engines, as the propulsion is through the air not the ground....... eating humble pie as we speak

Balllsenza, its great being self righteous, isn't it ?

 

[doitall]

Diyitall wrote

The plane will not take off.

No sh@it.
Never ceases to amaze me just how thick some people can be.

So which bit of space cats answer didn't you understand.

Perhaps it was having to keep adding more and more power

There is however one paradox in the original question:

Softus wrote:
This conveyor belt has a control system that tracks the aircrafts wheels speed and tunes the speed of the conveyor belt to be exactly the same as the wheels, but in the opposite direction.

[/quote]

 

[Balenza]

Balenza wrote

Off which you are obviously not one

I take that back Crockett. My apologies.

You've got it.

 

[doitall]

Oh ok I see it now. The conveyors opposing force has no bearing on the forward thrust of the planes engines, as the propulsion is through the air not the ground....... eating humble pie as we speak

Balllsenza, its great being self righteous, isn't it ?

But you don't see it crockett.

The plane is on its wheels, and as fast as the thrust of the engines pushes the plane forward, so the surface moves in the opposite direction at the same speed, apply more thrust and the wheels spin faster as spacecat said, but the surface also speeds up to match.

All you get is the wheels spinning faster and faster until you run out of more thrust/power.

Unless the wheels are spinning faster than the surface which they are supported on the plane will not move in its space.

 

[Balenza]

Diyitall wrote

The plane is on its wheels, and as fast as the thrust of the engines pushes the plane forward, so the surface moves in the opposite direction at the same speed, apply more thrust and the wheels spin faster as spacecat said, but the surface also speeds up to match.

All you get is the wheels spinning faster and faster until you run out of more thrust/power.

Unless the wheels are spinning faster than the surface which they are supported on the plane will not move in its space.

This is the greatest load of cobblers you have written so far.

 

[JohnD]

It is futile attempting to answer the question, since the question is defective.

It tries to trick you into thinking of the aircraft as propelled by traction through its wheels, like a car.

However since the aircraft is propelled by engine thrust, and not by wheel traction, the circumstances described in the question cannot occur.

 

[doitall]

Strange I thought you agreed with space cat.

 

[Balenza]

It is futile attempting to answer the question, since the question is defective.

It tries to trick you into thinking of the aircraft as propelled by traction through its wheels, like a car.

However since the aircraft is propelled by engine thrust, and not by wheel traction, the circumstances described in the question cannot occur.

And this is the greatest load of cobblers you have written so far.

 

[doitall]

It is futile attempting to answer the question, since the question is defective.

It tries to trick you into thinking of the aircraft as propelled by traction through its wheels, like a car.

However since the aircraft is propelled by engine thrust, and not by wheel traction, the circumstances described in the question cannot occur.

Whether it can occur or not is not the question JohnD.

However the aircraft is propelled is also irrelevant.

For the plane to reach take off speed the wheels have to turn faster than the conveyor belt.

Now read the original post, and Space cats post.