I would like to converse with someone off the board that has built their own PCP or is intimately familiar with them.
I built one of buckleys and everything functions fine with one exception, I cannot get above 690fps using crossman premier pellets.. Got a few extra holes in it but what the heck it's a proto type and my first build..
Here are the particulars:
.22 Caliber
20" barrel (lothar walther choked)
JDSairmans 13 cu. inch tank which has been filled as high as 2,500psi
Regulator on tank is 1,600psi
Right now I have a spring behind the striker that is as strong as I can use and still be able to cock it. It is a 2.75" long with .047 dia. wire.
If I use a piece of rod and hammer I can get good penetration with the pellet but not with the striker arrangement. I cannot go any heavier on the spring
I know I am not having an air leakage issue as everything is o-ringed. Since I was going to .22 and the plans were for a .177 I figured I would need more air and upped the port sizes a bit. Is it possible I am too big on these and in doing so I don't have enough air flow with the length of time the valve is open? I had to set the tank back a bit so where it screws on give it a fairly large reserve chamber so the volume of air should be adequate.
Anyhow if you have any idea I am all ears.. If you know of another forum I can try that is a little more into building PCP's I would be happy to do that also. I wanted to build a large bore PCP but NOT till I get this issue solved..
Thanks Much...
DonTMN