(3) The rate of recession, r, of each dimension of the propellant grain is dependent on the pressure, *P*,

according to the law: *r=BP *, where *B *and *n *are constants for a particular propellant composition and initial

temperature.

(4) Propellant gases are perfect gases with constant specific heats and molecular weights.

(5) The total energy made available by the combustion of the propellant is equal to the product of the mass of

propellant consumed and the specific energy of isochoric explosion (a constant dependent upon propellant

composition).

(6) Gas leakage is negligible.

(7) Work done against friction is negligible. (This assumption is applicable, in general, only to catapult

systems.) (8) The cartridge case ruptures when propellant combustion begins.

(9) Pressure, temperature, and composition of gases are assumed to be uniform throughout the chamber.

simplify the problem of computation so greatly that they are used widely in interior ballistic calculations.

ballistic performance of catapults and removers, and, with slight modifications; thrusters. The modifications of these

equations to adapt them for an analysis of the interior ballistics of thrusters are discussed in paragraph 54.

(1) *Conservation of energy.*

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