Procedures for making screw performance estimates, propulsion estimates and screw design calculations for screws of different diameters operating at varying rates of rotation in propelling hulls of varying aperture size, and application of results to propulsion estimates and design calculations for large tanker screw; significant improvements can be achieved by adoption of large diameter screws of up to 30 ft in diam running at low speeds (75 rpm) and driven via geared turbines in lieu of screws of about 24 ft diam running at moderate speeds (110 rpm) and directly driven by diesel engines; former gave increase in trial speed of 3%, in screw efficiency of 18% and in propulsive efficiency of 10%.
Optimum performance screws for large tankers
Shipbldg Shipg Rec
Shipbuilding and Shipping Record ; 107 , n 18
1966
5 pages
Article (Journal)
English
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