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Propeller Terminology

The Michigan Wheel guide to understanding propellers. Here you will find everything from propeller parts to terminology that will help you understand how boat propellers work.

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Blade

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.

Propeller Terms

Blade Blade Tip Cavitation Constant Pitch Propeller Controllable Pitch Propeller Cup Cylindrical Section Diameter Fixed Pitch Propeller Geometric Pitch Angle Hub Leading Edge Non Thru-Hub Exhaust Over-Hub Exhaust Over/Thru-Hub Exhaust Pitch Pitch Reference Line Radius Rake Rotation Skew Slip Thru Hub Exhaust Track Trailing Edge Variable Pitch Propeller Ventilation

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