Question: Will the plane fly? (warning: nerdy)
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Originally Posted by slagehammer
Now, say you put an airplane (with the jets OFF) on a treadmill moving the airplane backwards going 100mph.
When you turn on the jets, it will move the airplane forward on the treadmill's surface some... and with enough jet-force wouldn't it be able to match the speed of the treadmill?
When you turn on the jets, it will move the airplane forward on the treadmill's surface some... and with enough jet-force wouldn't it be able to match the speed of the treadmill?
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Last edited by svo+wrx; Apr 14, 2011 at 09:14 PM.
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I was asked this by a friend and I thought it was an interesting question.
A plane is standing on a runway that can move (some sort of band conveyer). The plane moves in one direction, while the conveyer moves in the opposite direction. This conveyer has a control system that tracks the plane speed and tunes the speed of the conveyer to be exactly the same (but in opposite direction).
The question is:
Will the plane take off or not?
Lets see how smart the BAIC really is
A plane is standing on a runway that can move (some sort of band conveyer). The plane moves in one direction, while the conveyer moves in the opposite direction. This conveyer has a control system that tracks the plane speed and tunes the speed of the conveyer to be exactly the same (but in opposite direction).
The question is:
Will the plane take off or not?
Lets see how smart the BAIC really is
lolOh damn this thread is from hella days ago...I just looked at the dates! LOL. WOOPS. oh well.
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hmmm... I don't design planes so I can't really answer that question. I believe a plane standing still in relation to ground does not generate enough speed (plane relative to air). However, a plane moving forward relative to ground plus the air flow generated by the jet/prop would bring the plane to the necessary speed (relative to air) for the plane to take-off.
Put it this way, if you hold on to a remote control prop plane. Reach max speed on the prop, let it go, it won't fly "STRAIGHT", it will fall! However, assuming you were at infinit height, the remote control plane will fall and move forward until it reaches neccessary air speed, the plane will then fly "STRAIGHT".
Put it this way, if you hold on to a remote control prop plane. Reach max speed on the prop, let it go, it won't fly "STRAIGHT", it will fall! However, assuming you were at infinit height, the remote control plane will fall and move forward until it reaches neccessary air speed, the plane will then fly "STRAIGHT".
the plane is exerting its force against the air, not the ground. the conveyor belt is irrelevant if the wheels are spinning freely
understand that it isn't the engine or wheels that make the thing fly. it's the wings, and for the wings to create lift u need wind/air to move around it. no forward motion of the plane = no wind/air moving around the wings = no lift = no take off.
WAIT! i just gave it some more thought.... the plane can take off because, the wheels will spin, but the wheels spining isn't going to affect the plane because it isn't the wheels the drive the plane foreword, but the engines are. thus the wheels will just spin faster and faster the other way, but the engines will push the plane foreword. the wheels are just keeping the plane off the ground... so yeah.... plane can take off...... unless the plane isn't moving forward....(gotta put that last part in to cover my ***)
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WAIT! i just gave it some more thought.... the plane can take off because, the wheels will spin, but the wheels spining isn't going to affect the plane because it isn't the wheels the drive the plane foreword, but the engines are. thus the wheels will just spin faster and faster the other way, but the engines will push the plane foreword. the wheels are just keeping the plane off the ground... so yeah.... plane can take off...... unless the plane isn't moving forward....(gotta put that last part in to cover my ***)
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"plane on a treadmill" Just saw it on a commercial break.
EDIT lol hmm just saw the reason this thread was bumped lol
If the conveyor belt could move at any mph, the plane would never lift off.
wheels have nothing to do with it, and the engines are useless because the only reason they have engines is to propel the plane and get the wind under the wings for lift.
like taking off at 200 mph WITH 200 mph wind, im pretty sure nothing would happen except a crash.
Smash lab is so stupid, anyone see the concrete braking ramp thing?
"the concrete is hard in some places and brittle in others... wahhhhh"
YOU HAVE TO MOVE THE HOSE AROUND THAT IS PUMPING THE CONCRETE! hows that for a variable RETARDS! they left it one place thinking that the concrete would all be the same and perfectly mixed.
"plane on a treadmill" Just saw it on a commercial break.
EDIT lol hmm just saw the reason this thread was bumped lol
If the conveyor belt could move at any mph, the plane would never lift off.
wheels have nothing to do with it, and the engines are useless because the only reason they have engines is to propel the plane and get the wind under the wings for lift.
like taking off at 200 mph WITH 200 mph wind, im pretty sure nothing would happen except a crash.
Smash lab is so stupid, anyone see the concrete braking ramp thing?
"the concrete is hard in some places and brittle in others... wahhhhh"
YOU HAVE TO MOVE THE HOSE AROUND THAT IS PUMPING THE CONCRETE! hows that for a variable RETARDS! they left it one place thinking that the concrete would all be the same and perfectly mixed.
Last edited by kYLEMtnCRUZr; Jan 28, 2008 at 11:57 PM.
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Wow. This again. A plane only takes off if there is air moving across the aerofoils at a high enough speed to create lift. The ground speed has nothing to do with it.
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put on some roller skates and stand on a treadmill, no matter how fast the belt goes you will still go nowehere. same principal in action here.