Can The Plane Fly?

[Mr Revhead[RL]]

hehe people are still looking at the wheels like wheels on a car...

 

think of them as bearings.... that allow a speed difference betweeb 2 objects, in this case the belt and the planes body.

 

you are also thinking in terms of someone on a treadmill, which is different as the motive force is acting independantly from the wheels/tread mill.

[Redwarf]

Some clarification needed. What drives the conveyer?

[Mr Revhead[RL]]

in this case, majic!

 

as it instantly matches the rotational speed of the wheels

[Redwarf]

In that case, plane no fly.

[wyldephyre]

In that case, plane no fly.

 

JUST LIKE THIS THREAD!!!

 

 

(Thank you, I'll be here all week) :lol: :) :)

[Mr Revhead[RL]]

:)

 

but plane do fly.

 

as the wheels arnt driving the plane... there just there to allow a speed difference between the two.

 

thrust moves the plane, it has too, basic physics says so.

thrust works against air.

 

the key is how wheels and wheel bearings work....

[Redwarf]

I can see your argument, I'm not sure I agree without a lot of brain strain that I'm currently not prepared to give!!

[Rolla__Boy]

:)

 

but plane do fly.

 

as the wheels arnt driving the plane... there just there to allow a speed difference between the two.

 

thrust moves the plane, it has too, basic physics says so.

thrust works against air.

 

the key is how wheels and wheel bearings work....

 

I've only been saying this the whole time

[Mr Revhead[RL]]

try placing a cold cloth over your head to help dissapate heat!

 

hey... theres another question..... can redwarf create enough heat to make enough steam from the wet cloth to power a generator enough to create enough power to power a fan to keep him cool

 

 

:)

[ancullen]

Imagine that the conveyor belt had nothing to run it, and the bearings in the conveyor belt were completely friction free. There is still friction between the plane's wheels and the surface of the conveyor belt. Now, put the plane's wheel brakes on and then fire up the jets. The jets will move the plane forward as the conveyor belt acts like a set of wheels with frictionless bearings. So the plane moves forward & accelerates to the required take-off speed. We all agreed on this?

 

Okay, so now we restore power to drive the conveyor belt. We begin again with the plane stationary. It's brakes are off and we fire up the jets. Let us say that the conveyor belt begins rotating as soon as the plane wheels begin to rotate. If the conveyor belt were not limited to moving in the opposite direction to the plane, but still had to match the plane's speed, then when the jets begin to work, the plane's wheels will not rotate, instead the conveyor belt will work in the same direction as the plane's movement, again acting a bit like frictionless wheels.

 

Now we repeat the previous example but now replace the directional component on the plane. If the plane's jets are switched on and begin to provide enough thrust to push the plane forward at 20km/h, then the conveyor belt is going to match this speed in the opposite direction, so for the wheels to remain in contain with the conveyor belt, they will have to rotate at 40km/h.

 

The thrust from the plane will move the plane forward under any of the above circumstances, as it does when a plane takes off normally. The wheel speed has little or no relevance, the wheels just hold the plane off the ground. So the plane will attain the right differences in air pressure above & below its wings and will take off.

 

Redwarf SuperJamie & Mr Revhead: do you agree?

Edited December 20, 2005 by ancullen

[Mr Revhead[RL]]

:)

[ancullen]

That's what I thought.

[Super Jamie]

no. stationary plane generates no lift. end of discussion.

[Mr Revhead[RL]]

yeah but its not stationary!!

 

your still thinking as if the wheels move the plane, they don't!

its thrust from the engine that moves it... not the wheels.

 

your still thinking likes its a car

[ancullen]

It's more like a car in neutral with the brakes off and someone pushing it.

 

Now if we add the conveyor belt into the equation, and have the people pushing it doing so from next to the car, but not on the conveyor belt. The wheels will spin with the conveyor belt, but the people can push it at the same speed as they are walking forward.