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.


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    Title :

    Evaluation of Tandem Propellers for Commercial Ships, Summary Report


    Contributors:

    Publication date :

    1984


    Size :

    53 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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