ADDED FLUID MASS AND THE EQUATIONS OF MOTION OF A PARACHUTE.

A general method for finding the equivalent external forces and moments due to added mass is given and the correct anisotropic forms of the added mass tensor are derived for the six-degree-of-freedom motion in an ideal fluid of rigid body shapes with planar-, twofold- and axisymmetry. These derivations may also be useful in dynamic stability studies of other low relative density bodies such as airships, balloons, submarines and torpedoes. The results indicate that added mass effects are more significant than previously predicted.