How Is a Propeller Like a Wing?

Think of a propeller as a spinning wing. In cross section, it is shaped like a wing to produce higher air pressure on one surface and lower air pressure on the other. This produces lift, but in a forward direction--a force we refer to as thrust. Its rotary motion through the air creates a difference in air pressure between the front and back surfaces of its blades.

(Rev. 09/17/96)