Wr V

Equation .1-15 can be used to plot a curve showing the free recoil velocity versus time for the period before the projcctilc passes the gas port. 1 he weights of the projectile and powder charge are both known and it is assumed that the weight of the recoiling parts has been estimated from a prelimi nary design layout. Also, the velocity of the projectile is known from the available ballistic data (fig. 3-18). Therefore, the ordinate of the free recoil velocity curve, t, can be found by multiplying the corresponding ordinate of the projectile velocity curve by the factor;

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