Force Tests of MK 13-1 Torpedo with Suspension Bands

The purpose of the tests reported herein was to determine the effect upon hydrodynamic characteristics of two suspension bands of the same design when placed on the Mk 13-1 Torpedo with band centers spaced 14 and 30 inches and symmetrical about the center of gravity. Particular interest was in the effect upon torpedo running speed. The tests indicated that the bands would cause a reduction of approximately 2 knots from the normal speed of 33 knots. Cavitation measurements indicated that both of the top and bottom protrusions would cavitate at normal running speeds and depths. The effect of the bands on moment, lift, and cross force coefficients is, generally, of a minor nature.