Plane on conveyor... Will it ever take off?

Tmall · 07-20-2009, 03:48 PM

No. Just because he is in the air force does not mean he controls the laws of physics.

The plane will absolutely positively move forward and take off. The only purpose the wheels serve us to keep the belly of the plane from rubbing on the ground.

The turbine or prop will produce forward motion through the air. The wheels will just spin uselessly as wheels do not move a plane.

Once enough forward momentum is reached by this plane moving forward (not stationary) then lift will be created and the plane will take off.

In fact, if the plane originally could take off on 100 feet of runway, it would only need 100 feet of conveyor.

HurricaneHeather · 07-20-2009, 03:52 PM

Quote:

Originally Posted by Tmall

No. Just because he is in the air force does not mean he controls the laws of physics.

Well there goes my whole belief system.

askmrjesus · 07-20-2009, 03:55 PM

Quote:

Originally Posted by HurricaneHeather

Well there goes my whole belief system.

Yeah, if the Air Force doesn't control the laws of physics, who does?

JC

HurricaneHeather · 07-20-2009, 03:56 PM

Quote:

Originally Posted by askmrjesus

Yeah, if the Air Force doesn't control the laws of physics, who does?

JC

Well up until a few minutes ago I never wondered about these things! Not I'm in a dead panic!

Lucky3623 · 07-20-2009, 04:00 PM

Quote:

Originally Posted by Tmall

No. Just because he is in the air force does not mean he controls the laws of physics.

No? Really? Damn... I need to do more research then... I also thought that wind is made by trees swaying back and forth in the atomsphere...

When a fighter jet lines up at the end of the runway, it typically runs its engines up to full speed before releasing brakes. The speed of the wheels on the jet is equal to the speed of the runway below it (0 mph). The air coming out of the back of the engine is over 1000 mph, much faster than the aircraft needs to get airborne. If the myth is right, the aircraft should lift off!

And here is the argument you typically hear:
But wait, the brakes are set!!! That is why it doesn’t work!
So the second the pilot lets go of the brakes, the jet gets airborne?
No, it gets airborne when the speed through the air (not over the ground) reaches the point to cause enough lift over the wings to overcome gravity (the weight of the jet.)

The compressibility of air and temperature differences result in vast differences in one if you try to hold the other constant.

Flexin · 07-20-2009, 04:47 PM

Quote:

Originally Posted by Lucky3623

No? Really? Damn... I need to do more research then... I also thought that wind is made by trees swaying back and forth in the atomsphere...

When a fighter jet lines up at the end of the runway, it typically runs its engines up to full speed before releasing brakes. The speed of the wheels on the jet is equal to the speed of the runway below it (0 mph). The air coming out of the back of the engine is over 1000 mph, much faster than the aircraft needs to get airborne. If the myth is right, the aircraft should lift off!

And here is the argument you typically hear:
But wait, the brakes are set!!! That is why it doesn’t work!
So the second the pilot lets go of the brakes, the jet gets airborne?
No, it gets airborne when the speed through the air (not over the ground) reaches the point to cause enough lift over the wings to overcome gravity (the weight of the jet.)

The compressibility of air and temperature differences result in vast differences in one if you try to hold the other constant.

Right so then how will a treadmill stop it from flying? It won't. The air going through the jet engine isn't moving over the wings. When they release the brakes it moves forward, gaining speed then when its moving fast enough through the air for the wings to create lift it will fly. Put it on skis and it will do it on snow. Put it on floats it will do it on the water. And the reason that works is because the wheels and ground don't matter.

James

Avatard · 07-20-2009, 04:26 PM

Gentlemen: Since the plane is on a treadmill, it is not being forced through the air, creating an artificial headwind. The only thrust to create speed differential with the surrounding air is the plane's thrust.

If the plane is of a design as to have enough thrust to get airborne essentially with no headwind (at least none induced by moving the plane forward, which the treadmill assures cannot happen), and by its own thrust alone, then it will take off.

The freewheel on the tires is exactly doubled, as has already been said. I believe the frictional losses, if within the spec of the wheels, is probably relatively inconsequential.

fasternyou929 · 07-20-2009, 04:49 PM

Quote:

Originally Posted by Avatard

Gentlemen: Since the plane is on a treadmill, it is not being forced through the air, creating an artificial headwind.

That's where the confusion lies. A treadmill cannot immobilize a plane, it can only rotate it's wheels, which will do absolutely nothing to slow it down.

Particle Man · 07-20-2009, 04:49 PM

Quote:

Originally Posted by askmrjesus

Yeah, if the Air Force doesn't control the laws of physics, who does?

JC

The CIA.

Duh.

Sheesh.

Adeptus_Minor · 07-20-2009, 07:18 PM

Quote:

Originally Posted by askmrjesus

Yeah, if the Air Force doesn't control the laws of physics, who does?

JC

Well, you were supposed to, but I can't even have faith in that anymore.
I'll be damned if I'm leaving Scotch & cookies for you this Christmas Eve.

ps. Is this argument still going on? Really people... someone just needs to ask NASA for a computer sim because this is wasting far too many peoples' time and brain power.

07-20-2009, 04:26 PM	#7
Avatard Crotch Rocket Curmudgeon Join Date: Nov 2008 Location: Here to integrity Moto: Li'l red baby Ninja Posts: 7,482	Gentlemen: Since the plane is on a treadmill, it is not being forced through the air, creating an artificial headwind. The only thrust to create speed differential with the surrounding air is the plane's thrust. If the plane is of a design as to have enough thrust to get airborne essentially with no headwind (at least none induced by moving the plane forward, which the treadmill assures cannot happen), and by its own thrust alone, then it will take off. The freewheel on the tires is exactly doubled, as has already been said. I believe the frictional losses, if within the spec of the wheels, is probably relatively inconsequential. __________________ Insert free thought here.

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07-20-2009, 03:48 PM	#1
Tmall Aspiring Rapper Join Date: Nov 2008 Location: Halifax, NS Moto: '12 CB1000R Posts: 3,569	No. Just because he is in the air force does not mean he controls the laws of physics. The plane will absolutely positively move forward and take off. The only purpose the wheels serve us to keep the belly of the plane from rubbing on the ground. The turbine or prop will produce forward motion through the air. The wheels will just spin uselessly as wheels do not move a plane. Once enough forward momentum is reached by this plane moving forward (not stationary) then lift will be created and the plane will take off. In fact, if the plane originally could take off on 100 feet of runway, it would only need 100 feet of conveyor.