go walk on a treadmill set it at a speed and walk that exact speed. then look to the left and see that you arent moving. so is somehow the plane just going to lift off. like i said if they put the plane at 1000knots and the treadmill at 1000 knots, the plane will basically just sit there, no wind, no nothing. now if the JSF was on there then this would be a different story

 

ok do that and jump, and see if you go flying foward................. case closed

 

you dont understand..that would be the case of the plane got it's power from the wheels.

but you know it doesnt, they are free spinning.


k imagine this...you obviously didnt read my post...

a plane with its wheels up, is flying about 3 feet above this infinite treadmill at a speed of 200 mph or w/e.

make sure you see that in your head..


now if it put its wheels down so they are on the treadmill, what would happen?


the plane would still be going 200 mph, the wheels will just be spinning incredibly fast.


THE ENGINES PROPEL THE PLANE NOT THE WHEELS!!

 

yes but we are talking about taking off. put your car on a dyno and give it gas. are you going to go foward?

 

thats because ziggy missed a factor


put roller skates on, and go on a tread mill. strap some rockets to your back. where do you go? foward....

 

its the SAME thing for taking off

a car is powered through the wheels!

a plane is not!!! cmon man, i know your smarter than this

 

if the treadmill keeps up with you, your going nowhere. you said the treadmill keeps up with the planes speed. i dont care if you put 50 rockets on you. your going nowhere

 

your rigth the treadmill thing was a bad example.

but what is stopping the plane from moving foward? the engines push the plane foward through the atmposphere. regardless of what the wheels are doing

 

^ correct

 

BINGO!

 

wow... how cn everyone argue this after it was already answered...

treadmill spin backwars
wheels have no engine attached to em...

a plane either has a propeller or a jet (or more) attached to it...

the jet pushed the air not the wheels...

wheels will spin treadmill will do whatever... but the jets will propel the plane...

wheels spin freely

 

im punching out of this one. its rackin my brain, lol

 

ok...

pertend that the plane hovers... why? the only purpose for the wheels is to keep the plane off the ground...

that being said...

the wheels are not hoving devices...

now a plane with hovering devices is on the tread mill... will it take off?

of coarse... the treadwheel moves but has no effect on the planes wheels...

kinda like a skate board on a regular sized treadmill... the treadmill is moving but not the the skateboard...

what everyone forgets is that wheels on a plane spin freely...

 

The plane would NOT take off because no wind would be creating lift. The plane would just stay on the treadmill, spinning it's wheels. When it's moving forward on a runway, you have the air molecules running over the top of the airfoil a little faster than the air molecules going under the airfoil, thus creating lift. Because the plane really isn't going anywhere, there wouldn't be any lift created because if the plane is going down the runway at 120 MPH then that is how fast the wind is going under the airfoil (give or take a few MPH because of wind etc.). You can test it out by yourself by getting on the treadmill, then crank that sucker all the way up and see how much wind you feel in your face. Should be none unless your treadmill is outside...

Physics 101 for you auto nerds

 

Disregard this post. Re-read the statement Greg said because I originally misinterperated it.

 

No. If you read my first post, that's my explaination. That second post I was responding to Greg's post but I re-read it because I thought he that he thought it COULD take off.

 

haha. you must have an F in that class

 

it can and will take off

more physics 112

 

How would it take off? The whole concept of lift is that you have air moving faster over the top of the airfoil then the air moving under it. When you're on a treadmill, there is no air going by because you're not actually moving anywhere. All you're doing is spinning the tires.

 

What if the speed of the treadmills reverse movement was greater than that of the plane's engine's capacity?

I mean, what bad s said is true..you need wind in order to have lift, the jet engines may be able to get it moving by sucking in air, but even if the plane can move...where is the wind that is needed to create lift for the wings? the engines do not make planes fly, they make them go forward, wind created from forward movement of planes is what makes them achieve lift.....so I don't really understand how a plane can take off from a treadmill, if it isn't achieving any forward motion. I could understand if there was a huge *** fan infront of the treadimll blowing air at an extreme speed at the plane, that would help it lift off...but not just from a treadmill.

That does not make sense. =\

 

lift is created because the plane is moving. the engines are pushing the plane through the air regardless of the wheels spinning

 

I realize that but the plane is still not moving so none of it is relevant. The plane itself either has to be in motion, going fast enough to create the lift, or it has to have some outside force (a huge *** fan) creating enough wind power to create it's own lift.