Chronographs on Vulcan .25 not good — see chart (Solved)
Hello, I have just recently been able to do a chrono on my Vulcan .25 and the results show a steady increase in FPS that just skyrockets towards the end of the shot string. Can someone please help me tune this thing up? Let me know what to adjust??
Thanks!
V
- You must be logged in to reply to this topic.
The problem could be from a couple of reasons concerning the regulator:
1. The bottom of the piston (thin end) isn’t seating enough or not at all. By “not seating” I mean that the end of the piston is not pressing against the delrin seat to prevent unregulated air from entering into the regulated air chamber. If this is the case, it’s just a matter of screwing the seat in so that the piston can press against it once the working pressure has been attained in the regulated air chamber. When screwing in the seat you’re essentially decreasing the clearance (when it opens) between the delrin seat and the end of the piston (thin side). Right now, your rifle is operating on unregulated mode; that’s why your string has a power curve.
2. The regulator may need to be serviced. Maybe the O-rings need to be replaced or the unit just needs to be cleaned and slightly re-lubed.
Ernest Rowe has Vulcan servicing videos on Youtube and on his website (http://sniperlabyo-precision-airguns.com/).