Quote:
Originally Posted by Qlong
Funny thing, I cut a length of spring some time ago when I had a PTW.
The stock spring with shooting at 495FPS on average with a string of 10 BBs, so I cut the length to 75% of the stock length and I had an increase to 515FPS with a much higher ROF.
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The ROF makes no sense to me. Cutting coils would make the spring stiffer and speed up the piston. You have to think of any coil spring as a long uncoiled spring or torsion bar. the longer and thinner the weaker, the shorter and thicker the stiffer. Progressive springs use tighter windings in places that will compress first and stack, effectively shortening the spring and raising the rate when they do.