14. 2 the rocket equation . we can now look at the role of specific impulse in setting the performance of a rocket. a large fraction (typically 90%) of the mass of a rocket is propellant, thus it is important to consider the change in mass of the vehicle as it accelerates.. Momentum and the rocket equation the rocket equation gives an explanation of how the gas ejected from the nozzle is used see why a low structural ratio results in a higher burnout velocity. a typical satellite launcher comprises about 80% propellant at launch.. Rocket equations mr = rocket mass in kg me = engine mass (including propellant) in kg mp = propellant mass in kg a = acceleration m/s2 f = force in kg . m/s2 g = acceleration of gravity = 9.81 m/s2 v
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