Propeller , consisting of blades placed on a rotating shaft and shaped in a suitable aerodynamic or hydrodynamic way; device that provides pushing or pulling force. Propellers are used in air and water vehicles.

In propeller aircraft, the propeller is the system that converts the rotation transmitted from the engine into thrust. It consists of two or more paldens. Because the propeller blades move approximately forward due to the thrust force and in the direction of rotation due to its rotation, it makes a twisting motion, also known as a helix, according to an outside observer.

Since the distance traveled by the blade tip in the rotation plane will be greater than the hub due to the radius of the propeller, the angular velocity of the blade tip is the same as the angular velocity in the parts close to the net, but the distance (speed) it travels per unit time is greater.