Abstract
For an arbitrarily shaped body, there may be more than one center of apparent mass. The apparent mass of a parafoil shape for motions along various axes is computed using potential flow analysis. From this, the 6 x 6 apparent mass matrix about some reference point is computed. Parametric forms for estimating the terms are given. The existence of multiple mass centers results in off-diagonal terms in this matrix that couple the translational and rotational motions. It is shown how the nondiagonal 6 x 6 apparent inertia matrix about a certain reference point can be used to compute the corresponding apparent mass matrix at any other reference point. Dynamic equations including nonlinear terms are presented.
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