Did You Know ?

The Propellers on most propeller-driven airplanes can be rotated in motion;
At Takeoff,when then need for thrust is greatest,the propellers are set at a low angle so they're almost perpendicular with the oncoming air.At Cruise altitude,pilots adjust the propellers so that they're at a a fairly sharp angle.

It was The Wright Brothers who first realized that propellers should be shaped like small wings (airfoils) that are twisted so they have a large angle of attack near the center and a small angle of attack at their edges.This way,They actually both push air back and pull aircraft forward.

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