Figure 2-20. Free Recoil Velocity While Projectile Is in Bore.

available ballistic data (fig. 2-5). Therefore, the ordinate of the free recoil velocity curve at any time, t, can be found by multiplying the corresponding ordinate of the projectile velocity curve by the factor:

Assuming that in the 20-mm gun to be used as an example the estimated weight of the recoiling parts is 50 pounds and the weights of the projectile and powder charge are as shown in fig. 2-5, the value of the multiplying factor is :

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