Part of a broader investigation concerned with the stability and dynamic load equations of boost vehicles. An earlier study, RM-3198-NASA, [On the Foundations of Dynamical Analyses of Boost Vehicles — I: The Homogeneous Problem], discusses the characterization of the dynamics of boost vehicles in the absence of aerodynamic and other external excitations. From an examination of the dynamics of deformable boost vehicles, this Memorandum shows that in some cases ignoring the effects of fuel flow is not justified. A derivation of the appropriate governing equations is presented, together with criteria for determining whether fuel flow is stabilizing or destabilizing.
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