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EFFECTIVE HORSEPOWER PREDICTIONS FOR A LANDING CRAFT (LCVP) FITTED WITH SPRAY RAILS AND FLAPS DERIVED FROM TESTS WITH MODELS 4031 AND 4031-2.
DAVID TAYLOR MODEL BASIN WASHINGTON D C
Tests of a bare-hull model of a landing craft LCVP were conducted at the heavy and light conditions over a speed range from 0 to 36 knots. The results indicated that the resistance requirement at the heavy displacement was higher at 21 knots than at 28 knots. Attempts were then made to lower this hump in the resistance by equipping the model with stern flaps and spray rails. These minor hull changes definitely lowered the effective horsepower required at the 20-knot speed, but the 5-deg flaps were detrimental at speeds above 23 knots. Accordingly, it is recommended that stern flaps be adjustable in order to vary the angle to an optimum for a specified speed. Author
Research and development rept.,