riddle
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Anyone remember the Plane on a conveyor belt question?
Would it take off?
the many pages on many forums w/ that question..I would figure w/ the 6ft fishing pole that it would come into two pieces like most fishing poles now days, so either he bought a knife and cut it in half, or a string to bend it & tie it up to stay bent so it was within the correct length. I'm sure both are wrong..
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A853 wrote:
Anyone remember the Plane on a conveyor belt question?
Would it take off? the many pages on many forums w/ that question..I would figure w/ the 6ft fishing pole that it would come into two pieces like most fishing poles now days, so either he bought a knife and cut it in half, or a string to bend it & tie it up to stay bent so it was within the correct length. I'm sure both are wrong..
It will take off
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torbs wrote:
Here's oneSo there's two friends driving in one of their cars. They line up to race one of their buddies when all of a sudden both people in car suddenly die. Hint, the car isn't moving and nothing hit the car.
What happened?
I farted:icon_porc:
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They get shot yo
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they were in a dsm and it burst into flames and blew up andthey both died.
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XJHEAD wrote:
It will take offNo it won't.
Don't start with me on this one, either. Ask Faber.
EDIT: I'll make it quick and painless.
Unless there is sufficient windspeed to lift the aircraft off the ground, it will not leave the pavement. Wheel speed has nothing to do with it. As an aircraft mechanic, they teach you that the landing gear is there for the sole purpose of supporting the aircraft as it is on the ground, and during take off and landing.
However.
An airplane can run it's engines at full throttle and go nowhere. Every plane I have witnessed take off at Grand Forks AFB, RAF Mildenhall and Al Udeid AB will always power their engines to the max, and apply full brakes. When the brakes release, the plane moves forward with a pretty decent amount of force. Riding on a civilian passenger jet won't show that because of the seat cushions. Riding in a KC-135 will show you that, because you sit on the side of the jet, and it throws you back like a subway train would, but with more force.
If the wheels are spinning, and the fuselage is not moving, no lift will take place. There has to be airspeed working against the leading edge of the wing for the bernouilli effect to work. If it's sitting on a conveyor belt, it will not move. Period.
-Peter
1991 240SX
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AFSil80 wrote:
No it won't.Don't start with me on this one, either. Ask Faber.
EDIT: I'll make it quick and painless.
Unless there is sufficient windspeed to lift the aircraft off the ground, it will not leave the pavement. Wheel speed has nothing to do with it. As an aircraft mechanic, they teach you that the landing gear is there for the sole purpose of supporting the aircraft as it is on the ground, and during take off and landing.
However.
An airplane can run it's engines at full throttle and go nowhere. Every plane I have witnessed take off at Grand Forks AFB, RAF Mildenhall and Al Udeid AB will always power their engines to the max, and apply full brakes. When the brakes release, the plane moves forward with a pretty decent amount of force. Riding on a civilian passenger jet won't show that because of the seat cushions. Riding in a KC-135 will show you that, because you sit on the side of the jet, and it throws you back like a subway train would, but with more force.
If the wheels are spinning, and the fuselage is not moving, no lift will take place. There has to be airspeed working against the leading edge of the wing for the bernouilli effect to work. If it's sitting on a conveyor belt, it will not move. Period.
What people fail to see is that it says the conveyor belt moves backwards at the same speed as the plane moves forward....basically the wheels spin twice as fast because of this and so long as the wheel bearings don't overheat and seize up before the plane generates enough airflow over the wings to achieve lift, the plane will fly. PERIOD.
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http://fargostreet.com/forums/showthread.php?t=5245&highlight=plane+conveyor+belt
Think about it this way if you are driving a motorcycle with a side car on it at 50MPH and the conveyor is ONLY on the side car you can still drive the motorcycle at 50MPH, however the sidecars wheel(s) will be traveling 100MPH. Same principal applies here. The planes motors providing thrust would be the motorcycle in above analogy and the planes wheels would be the side car. It is very possible for the plane to take off.
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The one thing I don't get is what the wheels have to do with anything, so they are moving 100mph, how is that moving any air over/under the wings?
Edit: Or in other words, how is the airplane moving forward relative to its static spot on the ground? How do the wheels moving at some speed have anything to do with lift?
I see it as like a treadmill. If you are running at 7mph, and the tread is going backwards at 7mph, you are in fact staying in the same spot relative to the ground, no matter how fast your feet are going.
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XJHEAD wrote:
Engine thrust is propelling the craft not the wheelsLift has nothing to do with how much thrust. Different aicraft require different amounts of thrust per weight.
It's all about the windspeed hitting the leading edge.
So again, if the wheels are freerolling and the conveyor belt is doing the same, the plane won't move. The wheels keep the airplane supported until it builds up enough airspeed for the bernoulli effect to take place.
If it can't hit that speed, and it won't while it sits on a belt that can keep up, there will be no forward motion.
-Peter
1991 240SX
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