This reference for all boats - power and sail, working and pleasure - is written not for Ph.D's seeking the latest wrinkle in high-tech propeller design, but as a practical aid for the average mechanic, engineer, boatbuilder, boatowner or naval architect. Propellers remain something of a black art and when a boat doesn't perform as advertised, it's often the propeller that's at fault. The handbook answers such questions as: why the engine won't reach its top RPM's; why the propeller shaft is vibrating; why the boat doesn't reach its advertised speed and if a bigger propeller will make the boat faster.