Saturday, May 18, 2013
Surfing For To Lift Up?
Mary asks…How do airplanes keep lift constant when velocity changes?When you're flying on a horizontal course, you want to keep lift constant, so it is exactly equal in magnitude to the force of gravity. But Bernoulli's theorem says that the faster you go, the more lift you get. So how do they keep lift constant when velocity changes?Nancy answers:If you fly more slowly, you increase the angle of attack of the wings (by pitching the aircraft upwards) in order to maintain the same amount of
