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Figure 2-33. Effect of Barrel Spring on Barrel Motion After Unlatching.

Figure 2-33. Effect of Barrel Spring on Barrel Motion After Unlatching.

the barrel motion and to find the time at which the barrel should be unlatched to satisfy the requirements of the preceding paragraph. The analysis of the barrel return motion is conducted in the same way as for the bolt return motion. (Cf. fig. 2-33.)

In this case, the initial velocity of the barrel is zero and therefore the free-velocity curve coincides with the zero axis. Since the barrel is latched at a displacement from the firing position of 0.160 foot, the initial compression of the barrel return spring is:

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