Abstract
While it has been known for many years that with identical propellers, the outboard screws of a four screw ship turn faster than the inboard screws, and that there is in consequence an unbalance on the power demand for the different shafts, it is only recently that the question of balancing the power demand on the four shafts has become interesting to marine designers. The desirability of doing this must be carefully weighed against the obvious advantage of having all propellers to the same diameter and pitch because of the expense of spares, but if after such consideration, a balance is still desired, the author deduces a method for modifying the pitch ratios.Those who are familiar with Mr. Labberton's contributions to gear and propeller design will be interested to know that he has recently severed his connection with the Design Division of the Bureau of Engineering to assume the duties of Assistant Professor of Mechanical Engineering at New York University.
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