This report reviews the development of equipment and procedures for the measurement of unsteady forces and moments on contrarotating propellers in the 24-inch water tunnel and presents the results from 4 x 4 and 4 x 5 bladed propeller sets in uniform flow. A serious problem encountered was that of maintaining the two propellers in a constant phase relationship. The unsteady thrust and torque measured on a 4 x 4 propeller set and the unsteady side forces and bending moments measured on a 4 x 5 set in both cases were larger on the forward propeller. A recently developed program for computing unsteady loading on contrarotating propellers was used to calculate values for the experimental conditions. (DePo)


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    Title :

    Experimental determination of unsteady forces on contrarotating propellers in uniform flow


    Additional title:

    Experimentelle Bestimmung der auf gegenlaeufige Schiffspropeller bei gleichmaessiger Stroemung einwirkenden Kraefte


    Contributors:

    Published in:

    Publication date :

    1976


    Size :

    36 Seiten


    Type of media :

    Report


    Type of material :

    Print


    Language :

    English




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