Various methods of reducing the propulsive power required by screw-propelled ships are considered. These include reducing surface roughness of hull and propeller, selecting optimum hull proportions and fullness for reduced power operation, enlarging the diameter of the propeller together with reducing propeller RPM, use of a ducted propeller rather than an open propeller, possible use of contra-rotating propellers, alternative modes of operation of twin screws at reduced power, reduction of above-water hull and superstructure resistance due to air drag are discussed in this report.
Some Practical Considerations in Reducing Required Power for Ships
1977
61 pages
Report
No indication
English
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