Maximum reach of the blade from the center of the hub. Separates the leading and trailing edges.

Edge of the blade that first cuts the water.

Edge from which the water exits the blade.

Side of the blade facing toward you while viewing from the vessel’s stern.

Side of the blade facing away from you while viewing from the vessel’s stern.

                    The area where the blade attaches to the hub. • Hub                     Solid cylinder located at the center of the propeller. Bored to accommodate the engine shaft. Hub s [..]

Slender rectangular slot broached into the interior of the hub. Helps to secure propeller to the shaft and prevent rotational slipping on the shaft.

Small radius or curvature located at the trailing edge of blade. Cupping, helps to reduce or delay cavitation. Helps to reduce slip, thus increasing actual pitch and usable thrust.

        Defined as the maximum radius of one blade multiplied by 2.         The diameter of the circle scribed by the blade tips as the propeller rotates.             General rules:                 Di [..]

Theoretical definition: The linear distance that the propeller would move in one complete revolution through a solid medium not allowing for slip. Because under actual operating conditions slip occurs [..]