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Figure 3-12. Graph of Factors Related to Selection of Piston Weight and Velocity.

corresponding values of \VL and Vi along with other related values which influence the design. This has been done in Table 3-1 and the resuits are shown graphically in figs. 3 12 and 3-13. The other values in the table and graph were found using the following formulas:

Velocity of piston after impact:

V'!=76.5-.55V, (ft./sec.) Energy lost by piston in impact:

Initial piston energy-:

Final piston energy:

Impact loss to heat:

Eh=El-Eg (Eo energy gained by bolt) Required gas impulse:

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