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This was posted on another forum and it has gone about 40 pages so far. I cant believe people cant figure this out. Its scarry how dumb people are. :rolleyes:
A plane is standing on a runway that can move (like a giant conveyor
belt). This conveyor has a control system that tracks the plane's
speed and tunes the speed of the conveyor to be exactly the same (but
in the opposite direction) instantly.
Will the plane be able to take off?
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Depends
No, it will fly... There is no question about it. :)
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Either way it will take off. LOL :)
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The wheels just roll so it doesn't matter how fast your spinning the conveyor belt, the wheels will just be moving faster. The plane will still fly, you'll just have more rolling resistance on take-off.
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It wont fly theres no air going over the wings so theres no lift........ :rolleyes:
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no air speed, no lift off. it can go 200 mph on the tread mill but it still has no lift. unless you have one hell of a head wind.
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How fast is the wind blowing??
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It wont fly theres no air going over the wings so theres no lift........ :rolleyes:
What would stop the plane from moving foward? The thrust isn't created from the wheels so it doesn't matter how fast the ground is moving.
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Of course it will fly. The plane is producing thrust at the body, not the wheels. It doesnt matter whats going on at the wheels. If it was a car with wings, NO it wouldnt take off.
I hope you guys are kidding when you say it wont take off. :rolleyes:
http://www.focushacks.com/uploads/diagram.jpg
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The plane will crash without taking to the air but the runway will accelerate at twice it's normal rate, take off, exceed Vne, and then crash also.
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It wont fly theres no air going over the wings so theres no lift........ :rolleyes:
Ding ! no air no lift. air has to travel across the wing to provide lift period !
C.T. :wink:
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Ding ! no air no lift. air has to travel across the wing to provide lift period !
C.T. :wink:
See!........... :crossx:
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If the plane had sufficient power, it might be able to take off with full brakes applied by stripping out the gears on the conveyor freewheeling the belt up to takeoff speed.
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A treadmill moving in the opposite direction of the plane, but at the same speed as the plane will cancel out all movement of the airplane, making it stand completely still. This will cancel out all airflow over the wings, thereby cancelling out all lift. All you end up with is the propwash...which does not produce lift...only thrust.
Now if the headwind is going the same speed as the airplane's Vr(speed of rotation), it will, however that would be one hell of a storm to fly into.
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Ding ! no air no lift. air has to travel across the wing to provide lift period !
C.T. :wink:
I concur....
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If the plane had sufficient power, it might be able to take off with full brakes applied by stripping out the gears on the conveyor freewheeling the belt up to takeoff speed.
Doing a little reaching there Tom.............. :p
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The plane will crash without taking to the air but the runway will accelerate at twice it's normal rate, take off, exceed Vne, and then crash also.
Hey if he's a good pilot he could stab the toe brake on one side , spin the plane around and use the conveyor speed to sling it airborne. :D
C.T. :wink:
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are we on page two yet? :crossx:
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A treadmill moving in the opposite direction of the plane, but at the same speed as the plane will cancel out all movement of the airplane, making it stand completely still.
No it won't. A plane doesn't use drive wheels to accelerate like a car does. It pushes against the air with a propeller or jet thrust making wheel speed almost irrelevant, within the limits of the bearings and wheels ability to withstand the centripetal force that comes from rotation.
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Who cares?? It will, the jet engines are producing the thrust. Simple.
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Hey if he's a good pilot he could stab the toe brake on one side , spin the plane around and use the conveyor speed to sling it airborne. :D
C.T. :wink:
unless hes in a tail dragger...........................
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Who cares??
Everyone who takes the time to post in this thread.
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This was posted on another forum and it has gone about 40 pages so far. I cant believe people cant figure this out. Its scarry how dumb people are. :rolleyes:
A plane is standing on a runway that can move (like a giant conveyor
belt). This conveyor has a control system that tracks the plane's
speed and tunes the speed of the conveyor to be exactly the same (but
in the opposite direction) instantly.
Will the plane be able to take off?
Yep it will take off, Conveyor tracks the planes speed therefore the plane is moving under it's own power. The wheels can spin either forwards or backwords makes no diff, the plane will move under it's own power and take off. :rolleyes:
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unless hes in a tail dragger...........................
Hmmm you're right . that may be the best groundloop ever ! Hold my beer,, lets try it :D
C.T. :wink:
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Hmmm you're right . that may be the best groundloop ever ! Hold my beer,, lets try it :D
C.T. :wink:
Hit it! :coffeycup :D
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No it won't. A plane doesn't use drive wheels to accelerate like a car does. It pushes against the air with a propeller or jet thrust making wheel speed almost irrelevant, within the limits of the bearings and wheels ability to withstand the centripetal force that comes from rotation.
Is'nt crazy people dont understand that. :rollside:
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Is'nt crazy people dont understand that. :rollside:
Your graphic pretty much lays it out as clear as it could possibly be.
Speaking of laying out, I'm going to go back to imagining what it would be like to lay down with Pamala David.
Have a nice evening. :)
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Your graphic pretty much lays it out.
Speaking of laying out, I'm going to go back to imagining what it would be like to lay down with Pamala David.
Have a nice evening. :)
Thats right Tom I knew you would be the one to leave your wingman! :cool:
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My wingman is in tight formation right now.
ttyl...
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My wingman is in tight formation right now.
ttyl...
"TMI"
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I can't see how they argued this to 40 pages. I seems clearly evident that the thrust from a prop or jet would propell an airframe forward irrespective of a conveyor belt runway.
Then again, we went 120 pages on "sunk the boat" & still have to ask when the boats gonna come up! :rolleyes:
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If "Later" posts then this could go 40 pages :)
Very complicated way of asking " If a Rooster laid an egg?".
The very second the plane is throttled up it will move forward....and it doesent matter if the wheels are spinning 1000 mph just as long as they are there to support the plane until "V2" is reached and the plane can take off.
Its an air speed thing.
If the plane is moving 100 knots then the wheels are moving 200 knots. Makes no difference. Need a runway length treadmill though.
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I can't see how they argued this to 40 pages. I seems clearly evident that the thrust from a prop or jet would propell an airframe forward irrespective of a conveyor belt runway.
Then again, we went 120 pages on "sunk the boat" & still have to ask when the boats gonna come up! :rolleyes:
Seems to me no matter how much thrust is applied with the plane still on the ground it will not create groundspeed since the treadmill compensates for any forward motion of the wheels.
So as been said, no lift............she stays on the ground. :rolleyes:
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it would be the same if you were to secure the plane to the ground...no forward motion no lift off
but im no pilot
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the answer was up top somwhere..ground speed would be X but airspeed would be say Y "something different"... if the plane needs 150 knots to take off then the wheels or ground speed would be at 300knots but the airspeed would still be 150knots....as stated above dosen't matter what the wheels are turing all that matters is that the plane is thrusting forward... if it was a car it wouldn't move but since the wheels on a plan just freespin (unless under breaking); the plane will still move....
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Yes, it will fly... the question never states the airplane stay stationary... just that the treadmill moves in the opposite direction as the wheel speed... the wheels will just be going twice as fast when the airplane lifts off.
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the question never states the airplane stay stationary... just that the treadmill moves in the opposite direction as the wheel speed
Hey Sleek, reread the question. It never mentions wheel speed it says PLANE speed and then moves the treadmill in the opposite direction accordingly, which would mean that the plane stays stationary, which means no lift, which means no takeoff. ;)
A plane is standing on a runway that can move (like a giant conveyor
belt). This conveyor has a control system that tracks the PLANE'S
speed and tunes the speed of the conveyor to be exactly the same (but
in the opposite direction) instantly.
Will the plane be able to take off?