Blade Back
Suction side. Forward side of the blade (surface facing the bow).

Blade Face
Pressure Side, Pitch Side. Aft side of the blade (surface facing the stern).

Blade Number
Equal to the number of blades on the propeller.

Blade Root
Fillet area. The region of transition from the blade surfaces and edges to the hub periphery. The area where the blade attaches to the hub.

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