As part of an assessment of the performance improvement potential of tandem propellers, preliminary design studies were made to compare efficiencies of tandem propellers with conventional propellers over a wide range of merchant ship types, sizes, powers, and speeds. The sensitivities of propeller efficiency to major tandem design variables, such as RPM, diameter, number of blades, phasing, axial spacing, load split, and strength were also assessed. Over quite a range of thrust loading coefficient values, tandem propellers are shown to have a small advantage in efficiency as compared to conventional propellers. Cavitation tests made in the Center's 24-inch variable pressure water tunnel in a simulated wake, provided data on inception speeds as well as patterns at design condition.
Evaluation of Tandem Propellers for Commercial Ships, Summary Report
1984
53 pages
Report
No indication
English
Marine Engineering , Merchant ships , Marine propellers , Evaluation , Performance , Comparison , Design , Thrust , Torque , Cavitation , Wakes , Model tests , Tandem propellers
Engineering Index Backfile | 1944
|Manufacture of ships' propellers
Engineering Index Backfile | 1951
|Engineering Index Backfile | 1943
Dimensioning of ships propellers
Engineering Index Backfile | 1930
|SLUB | 1937
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