Motorhead, how much could a huma improve my shot count at this FPE?
Quote from: PBguns on June 01, 2016, 04:05:15 AMMotorhead, how much could a huma improve my shot count at this FPE? Here the shot string from my .22 m-rod using regulator & 28 gram LW hammer w/o an ssg fitted.Shot JSB 18.1's average @ 865 fps for 30 ft lbs.
Nice work! I would not have thought a ssg and lw hammer would get to 40fpe. What were the power mods? Just a hill valve, tp, and poppet spring?
Yeah....that's a pretty nice string for sure!I have looked at plenty .22 and .177 regulated strings...but not many .25.Just wondering how a regulated .25 would perform.Guess I need to just order a huma and find out!
What is the length of the bolt and of the hammer? I am getting ready to order some materials.
Decided I couldn't leave it alone just yet.I made a spare hammer, decided I would see what adding more de-bounce properties to it would have on the latest string.I drilled and tapped 8 holes on the back of the hammer. The holes are drilled to within .250" of the front face (each hole can be partially filled with lead shot then sealed with set screw).Has anyone tried this (can tell me if this is a waste of time)? I won't have time until the weekend to install and get a test string.
Just thoughts on the dynamics .....If each drilled hole has a free floating BB / lead shot ... If rifle was shot say pointed upward, the shot would be at the rear up against grub screws and upon hammer release stay there until contact with poppet where the sudden deceleration would send them forward acting as a no bounce hammer does ... Yup concept is correct.Now if shot pointed downward the BB / shot would already be forward and upon hammer release slam rearward then become as stated first thrown foward upon contact with poppet.ISSUE I SEE ... is the energy of the hammer changing due to the No Bounce effect being Damped from shot being forward then impacting the rear.* Because a PCP when wanting TIGHT ES figures requires the hammer energy to be VERY CONSISTENT shot to shot, having this loose shot CHANGING this pending on where the BB/ shot is each shot, this stability could be lost ?Just thinking out loud here ....* If BB/ shot has a spring / magnet ( If steel BB ) preloading it be at the rear each shot it would bypass this issue I'm describing.Scott
FWIW ... having made, sold and set up guns for customers, done 100's of LW nylon hammers, some with a PEEK striker contacts, bounce has not been an issue at pressures above say 1400-1500 psi used within .177 & .22 rifles in the 15 to 35 Ft lb power range.LW hammers with such low mass the rebound energy seldom is enough to crack the valve a second time upon a bounce. They can certainly .. but with a proper poppet spring tension and a good tune balance with regulated pressure would suggest going K.I.S.S. and play without all the widgets first