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Figure 1-11. Graph of Projectile Bore Travel Versus Time (20 mm Gun).

Figure 1-11. Graph of Projectile Bore Travel Versus Time (20 mm Gun).

gas pressures art because the retarding forces are negligible when compared to the forccs exerted by the powder gases.

Equation 1-1 can be used to plot a graph of bolt momentum versus time for the period before the projectile leaves the muzzle. T he weights of the proje.ctilc and powder charge are both known and fig. 1-10 gives the projectile velocity at any time. Therefore, the ordinate of the bolt momentum curve at any time, t, can be determined by multiplying the corresponding ordinate of the projectile velocity curve by the factor

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