http://u.cubeupload.com/crazyhorse4/AirRifles001.jpgTop,Co2 9oz tank 300 shots @ 800 FPS all Roald built...Other two HPA...(Bottom) .22 cal regulated 1900 psi @ 940 FPS 30 ft lbs......(Middle) .177 cal regulated 1900 psi @ 960 FPS 20 FT LbsREG design: 4500 psi input,...2700 psi output...therefore, 1900 is about mid-range.
I'm guessing that you'll want to boost that reg to 1200psi to get what you want. The 850 has some inherent leak paths in the powertrain that you will need to compensate for by upping the pressure and increasing the plenum if possible.
Quote from: fivestar45 on February 15, 2019, 04:14:17 PMI'm guessing that you'll want to boost that reg to 1200psi to get what you want. The 850 has some inherent leak paths in the powertrain that you will need to compensate for by upping the pressure and increasing the plenum if possible.Hi Anthony The only way i see to increase the plenum is bore out the long AS to PB adapter and remove the check valve from the regulator bonnett but this way the tank can't be removed under pressure anymore.
Quote from: Tucobenedicto on February 15, 2019, 04:29:47 PMQuote from: fivestar45 on February 15, 2019, 04:14:17 PMI'm guessing that you'll want to boost that reg to 1200psi to get what you want. The 850 has some inherent leak paths in the powertrain that you will need to compensate for by upping the pressure and increasing the plenum if possible.Hi Anthony The only way i see to increase the plenum is bore out the long AS to PB adapter and remove the check valve from the regulator bonnett but this way the tank can't be removed under pressure anymore.Hi FabioI'm still working on version II but for sure there two things that the 850 needs..a better valve poppet & seat, and more valve volume. On my latest valve I opened up the I D of the valve and am using a M'rod poppet. also working on a different non bottle air source that will have much more plenum.
Few points about HPA's:Comprssors seem to make folks disinterrested in efficiency...after all, a new fill is just an electric switch click away. When you gotta hand pump that tank back up again, you're more interrested in getting value out for the effort put in. I do see shot count results mentioned in post and run it though the calculator, but normally keep the results to myself.Air use (efficency) is not really dependent on energy. 12.5 foot pounds X 140 shots is going to work out to the same as 25 foot pounds X 70 shots or 6.25 foot pounds X 280 shots so far as air use (with the same sized tanks/same pressure output).Evidently, are a few others falling down the same rabbit hole, as there are a few that actually managed to be pretty efficent and consistent.YOUR 140 shots for pugglin in an 850 PSI HPA tank is actually much better than I got with the 850 (which wanted to be a real air-hog). I had to woirk on it quite a bit to get it to that point.I normally won't shoot 140 shots in an afterwork session of shooting (although,come the long day's of summer, that might be about right). So I normally get laszy and get 3 or more seeesions of daily shooting out of that fill up and have to refill.That's certinaly enough shots for MANY days of pest-shooting (how may pests you got in a given day to shoot at?) or hunting during hunting season (what's the daily limit on squirrels in your area?)...but can blow though that easily in a day's plinking.
Something like this will yield a bit of plenum increase. https://www.ansgear.com/Ninja_Tank_Regulator_Extender_Black_p/ninjatankregextenderblk.htm?gclid=CjwKCAiAhp_jBRAxEiwAXbniXZ2BSYol7_zTKK6F6scr-Xa74OwewDsvNqusc2bfGlTiVYoCWwECmhoCikoQAvD_BwE