Dynamic Coefficients of the MK-13 Torpedo

Abstract

The forces and moments which act on a submerged body undergoing unsteady motion can be described in terms of selected dimensionless constant hydrodynamic coefficients if the instantaneous angles of attack are kept small. To determine the values of these coefficients a model of the body can be supported from the spindle of a dynamic balance (1) in the flowing stream of a water tunnel working section. This procedure was carried out for certain coefficients on a 2-inch diameter model of the Mk-13 torpedo (Fig. 1) using the Angular Dynamic Balance in conjunction with the High Speed Water Tunnel at the California Institute of Technology, Hydrodynamics Laboratory.