A Lifting-Surface Program for Contrarotating Propellers
DAVID TAYLOR RESEARCH CENTER BETHESDA MD SHIP HYDROMECHANICS DEPT
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A new lifting-surface computer program for a set of CR propellers has been developed based on a modified version of the MIT lifting-surface design program with hub effects. This program automatically computes the velocities induced by one propeller on the other. In addition, the hub portion of the program is modified to account for the velocities induced by one propeller on the hub of the opposite propeller. The data from LDV measurements of induced velocities are used to adjust the shape and distribution of the wakes shed from the two propellers. A comparison between the conventional and the new methods for the design of a set contrarotating propellers for a surface ship is also given. Keywords Marine propellers.
- Marine Engineering