Funny pic/gif thread...

46850126_1981634018581925_7435478113326202880_n.jpg

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The wheels aren't driven like a car or a train they just freewheel. If you put that 747 on ice and locked the brakes it could takeoff without the wheels moving at all.

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No. For the plane to take off lift has to be created on the wings. Even though the wheels are turning, the plane is stationary and there is no air moving over the wings.
 
lucasi1 said:
No. For the plane to take off lift has to be created on the wings. Even though the wheels are turning, the plane is stationary and there is no air moving over the wings.
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Having worked on a runway lighting job, in Anchorage, in December, I can assure you there is plenty of air moving over the wings before the wheels ever roll. By the way, really cold air, in Anchorage in December.
 
lucasi1 said:
No. For the plane to take off lift has to be created on the wings. Even though the wheels are turning, the plane is stationary and there is no air moving over the wings.
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If the headwind is moving past the plane as fast as the plane’s minimum flying air speed, then its propellers can lift it off with no forward ground speed - even if the plane is moving backwards on the conveyor belt. In a fast enough headwind a plane can actually fly backwards relative to the ground.

pj
chgo
 
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Patrick Johnson said:
If the headwind is moving past the plane as fast as the plane’s minimum flying air speed, then its propellers can lift it off with no forward ground speed - even if the plane is moving backwards on the conveyor belt. In a fast enough headwind a plane can actually fly backwards relative to the ground.

pj
chgo
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do 747s have propellers?
 
How much air is moving beneath the wings if a conveyor is matching wheel speed?

Air pressure beneath the wing is what creates lift
 
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