Propellers: the basics

Article Abstract:

The efficiency of the propeller is influenced by a variety of factors including relative velocity, blade geometry, and design. The propeller's efficiency is increased by lessening the propeller's speed and increasing its diameter. Hull forms, wake factors, noise and vibration affects the propeller's design. Cavitation, due to increased speed and increased angle of attach, can be prevented by tip unloading, that is, decreasing the pitch of the blade at the extreme radius.

Ship Building and Repairing, Marine Propellers, Methods, Design and construction, Cavitation, Ship propulsion, Marine propulsion systems, Propellers

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Clean air; clear conscience

Article Abstract:

Research into the reduction and control of smoke emissions from ships is discussed. The engineering behind the development of the Invisible Smoke medium-speed engine by MAN B&W, successfully adopted by several ships, is explained.

United States, Deep sea foreign trans. of freight, Deep Sea Freight Transportation, Cargo Ships NEC, Innovations, Product information, Cover Story, Air pollution, Cargo ships, Shipbuilding, MAN B und W Diesel GmbH, Smoke

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