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.01 .02 .03 .04 .05 .06 .07 .08 .09 .10 TIME (SEC) Figure 1-40. Variation of Spring Force With Time (Bolt Spring Only After Unlocking).

actcristics of the bolt driving spring so that the bolt will open the required distance of 10 inches to permit feeding. Fig. 1-37 shows that the maximum free recoil velocity of the bolt is 34 feet per second. Since this velocity is imparted within 0.010 sccond, it may be assumed that the initial bolt energy is imparted instantaneously. The value of this energy is given by equation 1-6:

Evaluating this expression for the conditions of the example gives:

Since the bolt driving spring must absorb this amount of energy over a distance of 10 inches (0.833 leet) . the average force exerted by the spring must be:

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