Early developments
The principle employed in using a screw propeller is derived from stern sculling. In sculling, a single blade is moved through an arc, from side to … See more

Shaft protection
For smaller engines, such as outboards, where the propeller is exposed to the risk of collision with heavy objects, the propeller often includes a device that is designed to fail when overloaded; the device or the whole … See more

• Screw-propelled vehicle – Vehicle propelled by load-bearing rotating helical flanges
Propeller characteristics
• Advance ratio – Ratio of freestream speed to tip speed
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In the nineteenth century, several theories concerning propellers were proposed. The momentum theory or disk actuator theory – a theory describing a See more

Variable-pitch propeller
Variable-pitch propellers may be either controllable (controllable-pitch propellers) or automatically feathering (folding propellers). … See more

A cleaver is a type of propeller design especially used for boat racing. Its leading edge is formed round, while the trailing edge is cut straight. It provides little bow lift, so that it can be used on boats that do not need much bow lift, for instance hydroplanes See more

• Titanic's Propellers
• Theory calculation propellers and wings: detailed article with blade element theory software application
• "What You Should Know About Propellers For Our Fighting Planes", November 1943, … See more