MODEL EXPERIMENTS TO DETERMINE THE RELATIVE EFFECT OF PROPELLER STRUTS AND BOSSINGS ON THE STEERING OF A TWIN SCREW SHIP.
DAVID TAYLOR MODEL BASIN WASHINGTON D C
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The tests were undertaken to establish the influence of propeller bossings as compared to propeller struts on the turning of a twin screw ship, and also to investigate the influence of cutting away the stern deadwood. For these experiments the 160 scale model of the U.S. Battleship New Mexico was fitted for self-propulsion with two propellers of four inches diameter and four inches pitch. The displacement of the model for all the tests was 324 lb. and the initial speed was 2.84 knots, which corresponds to a ship speed of 22 knots. Only one rudder form, a conventional balanced rudder, was investigated. The area of this rudder was made twice the normal area in order to obtain a full turning circle within the limits imposed by the width of the model basin. This artificiality, of course, destroys the absolute value of the tests but should not impair their relative value. Author
- Marine Engineering