why an air plane stays in the air?
2007-03-07 09:56:40 · 8 answers · asked by beauty mirna 3 in Science & Mathematics ➔ Physics
Calin's answer is best of those I see now. There is another reason, though. (If it were just Calin's explanation, then planes wouldn't be able to fly upside down, which they can.)
In addition to having the shape needed for Calin's effect, the wing has a little bit of a tilt. So as the plane is pulled forward by the propellor (pushed forward by the air would be more accurate) the air hits the wing and is deflected downward. This provides a reaction force upward. It's only recently that physicists have begun to give this reaction force more credit for lifting the plane than the traditional Bernouli's principle explanation that's behind Calin's explanation.
2007-03-10 01:49:03 · answer #1 · answered by Rob S 3 · 0⤊ 0⤋
The engine pushes the airplane forward through the air. The wings are shaped in a special way that cause the pressure under the wing to be higher than the pressure above the wing, which creates uplift. The uplift is a function of the shape of the wing, the speed of the plane and the density of the air (among other things). When the uplift equals the weight of the plane, it stays up. When the wing changes (breaks) the plane goes down. If the plane stops, it goes down. (That's why in the airport the planes stay on the ground. When they need to take off, they pick up speed on the runway.)
2007-03-07 18:47:07 · answer #2 · answered by Calin C 1 · 1⤊ 1⤋
Essentially, it is the air-pressure UNDER the wings, pushing the plane UP, as the propellar pushes the plane FORWARD through the atmosphere. So the speed of the engine keeps the plane up in the air, and the plane crashes when the engine stops.
2007-03-07 18:05:41 · answer #3 · answered by Anonymous · 0⤊ 1⤋
lift is provided by the curvature of the top surface of the wing.The wing curvature causes a reduction of pressure on the top of the wing thus the resultant force is upward.
2007-03-07 18:11:02 · answer #4 · answered by confused 3 · 0⤊ 0⤋
i hold them with my hand.
i have an infinite number of hands.
they are tethered to the moon.
2007-03-07 18:02:44 · answer #5 · answered by other_user 2 · 1⤊ 1⤋
because of the peanut butter jelly law of quantum astrophysics.
2007-03-07 18:10:42 · answer #6 · answered by mobious_zero 2 · 1⤊ 2⤋
and it also has a big bloody engines which do 500mph hmmm
2007-03-07 18:23:10 · answer #7 · answered by darlolad2000 1 · 0⤊ 1⤋
so you could ask this question
2007-03-07 18:00:53 · answer #8 · answered by Digitaltech 1 · 0⤊ 1⤋