That plane/conveyor problem - filmed solution

[GingerNinja]

For those who still can't see that the plane will take off, someone's made a film to prove the point that it would......

http://videos.streetfire.net/player.a

Apologies if this was shown before.

[MTv Dave]

How's that prove it would take off?

[bigjimmy]

All I'm getting is a gray screen.

[ahonen]

MTv Dave said:

How's that prove it would take off?

Dear god, please, not again.

[Robatr0n]

I hope someone comes and links to the last mass discussion on this.

[Lurking Lawyer]

Can someone please take off and nuke from orbit the server containing that linked video please? It's the only way to be sure.

[beyond rational]

I much prefered the science in this explanation:

www.youtube.com/watch?v=IZGdUAiMcPs

Repost i know.

[Brink]

Sorry, but that is just pure bollux.

[3200gt]

Flight is to do with airspeed over/under the wing and nowt to do with relative ground speed. So that is as you say pure bol**x.

[MTv Dave]

ahonen said:

MTv Dave said:

How's that prove it would take off?

Dear god, please, not again.

Please don't blame me, I thought it'd be locked already!

[Brink]

After some thought, I reckon GingerNinja must really be pulling our legs. Sure he doesn't really believe that bollux?

Do you?

[dilbert]

Come on people everybody knows that the purest source of bollux is the great TB. That wasn't TB, so I'm 52% sure that that video wasn't pure bollux.

[mark r skinner]

Brink said:

Sorry, but that is just pure bollux.

The video ? The post ? The plane/conveyor interface ?

[ehyouwhat]

Nooooooooooooooooooooooooooooooo!

We all know the plane would take off anyway

[paulie-mafia]

That skateboard / fan set-up bears no relation to the plane scenario. The skateboard doesn't have wings or anything to give it lift and the guy tugging the paper from underneath it is doing so in an inacurate manner that doesn't exactly match the opposing force of the fan / skateboard as it needs to.

[GingerNinja]

paulie-mafia said:

That skateboard / fan set-up bears no relation to the plane scenario. The skateboard doesn't have wings or anything to give it lift and the guy tugging the paper from underneath it is doing so in an inacurate manner that doesn't exactly match the opposing force of the fan / skateboard as it needs to.

Must......resist........urge......to.......respond

[mini_ralf]

It'll never work. I was always told that it's airspeed over the wings that generates lift.. Simply moving something rapidly under the plane won't make the air move faster over the wings... Or have I really got the wrong end of the stick?

[Graham@Reading]

Oh ....

[Davi]

oh dear, was that my will to live that just fell out my nose?

[bobthemonkey]

mini_ralf said:

It'll never work. I was always told that it's airspeed over the wings that generates lift.. Simply moving something rapidly under the plane won't make the air move faster over the wings... Or have I really got the wrong end of the stick?

A lot depends (we think-Asked hung-over engineers and physicists) on t/w ratio's. if the t/w>1 then the plane should ake off without an lift, at t/w<1 lift is needed to achieve flight. Look at it like this two identical planes A (t/w>1) and B(t/w>1). Point them so they are facing vertically upwards. A will go up, B will not. Assuming (and its a big assuption) the conveyer belt acts in a way to prevent air moving over the wing (ie the plane is stationary) A will take off, B will not.