The loss due to the combined effects of the spring constants as determined by the methods of step 4 modified to account for the difference described in the preceding paragraph is only about 0.0446 foot per second. The final gun motion curves shown in fig. 3-27 are the result of performing steps 2 and 3. Since the velocity loss due to the effect of the spring constants is so small, it is not necessary to take step 5.
The retarding cffcct of the bolt driving spring Ls found as follows: Step 2 is performed to determine the bolt velocity loss due to the effect of the initial compression. The total loss between the instant of unlocking and the instant the piston strikes the bolt is:
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