Many of the torques produced by the motion of parts within a body are negligibly small in most engineering applications. However, if the body is a satellite vehicle these small torques can be significant, even to playing a dominant role in the excitation of satellite attitude motions. This paper derives a complete expression for the attitude perturbation torque from this source, interpreting each of its terms. The atittude reference co-ordinate system is discussed. The nature of the torque is found for three simple cases.

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