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Old 28th October 2015, 07:35 AM
neilL neilL is offline
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Join Date: Mar 2010
Member of: NOFTC CRPC
Location: Oxford
Posts: 576

Looks really good for a prototype!
How about a simple (and cheap) calibration rig to go with it? Something like a pendulum with an indicator arm (the sort that stays at the max swing when the arm swings back) so the fixed rod can be placed against a plate and the firing rod can then strike with a known max energy. Set so that the max energy is equivalent to a pellet landing at 50m which started with the max (e.g. 11.5ftlbs or whatever) e.g. your 5.5ftlbs.
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