A propeller can be seen as a rotating fin in water or a wing in air. The horizontal axis of rotation produces a dynamic force as thrust. The force produced is from the difference in pressure from the forward and rear surfaces of the blades.
fan that transmits rotational motion into thrust
F4U Corsair propeller
Soviet 14-ton Voroshilov cruiser proppeller at the Museum on Sapun Mountain, Sevastopol
Schiffsschraubenflügel in Saarlouis
Propellers on the Ticonderoga-class cruiser USS Cowpens