Good call on the weak point. For those who are not intimate with the Evanix receiver, the pivot bolt for the side lever is only fully captured at the top of the receiver and the bottom is threaded into a slide in plug. The only constraint that prevents the plug from being pushed out of the receiver during the firing cycle is the friction that occurs when the pivot bolt pulls the plug to the top of its mounting recess. The pivot bolt takes all the push back force of the bolt when under pressure, for 120 fpe stock guns this works fine; increase the power or caliber slightly it becomes a weak link. The Sniper appears to have a stop plate to hold things in alignment, I'm sure they needed to beef it up due to the added bolt face area of the 45 and 50 calibers. Tom
I'm going to say yes and no to your post. Considering the genesis of the Rainstorm as a small bore platform with factory performance in the 50 to 60 fpe range their hammer design is quite adequate for that purpose. Yes it is a light hammer at 38 grams (I just found out the Marauder is in the 60+ range) but has a considerable stroke at ~1.2" IIRC. When converting my 22 cal. Rainstorm2 to 30 cal I had no problems reaching 120 fpe with the factory hammer and slight spring increase. Above 130 fpe, more or less the factory tune a 9mm RS2, the 38 gram hammer system is probably maxed out unless you use some very heavy springs which will undoubtedly make the cocking force less than pleasant. For factory power levels up to 9mm and maybe the 45 the factory system is fine.Where you are going is another story, I can easily see where the factory system would inadequate at some point. My suggestion is to make a heavier hammer from tungsten which could easily double mass in the same space as the steel one. Another possibility is to make a new hammer from steel with a male spring guide to add extra mass, remove and replace the existing spring guide from rear adjuster with a hole to allow the hammer guide to pass through.hammer with spring guide.Tom
The lift will increase as the pressure decreases.... Typically about twice as great at the low pressure end of the string as where you start.... Often the lift at the fill end is roughly 1/4 of the throat diameter (or less) for a well tuned PCP.... If it's much greater than that, you are likely going to see a decreasing string (first shot fastest)....Bob
If you ever get to 6mm lift, I would think you would just be blowing most of the air out the barrel, from my experience.... Just because it is available doesn't mean you can, or should, use it.... The flow maxes out at 1/4 of the throat diameter (so if the throat is 8mm, that is only 2mm lift).... After that, hitting the valve harder only increases the dwell, not the flow rate.... Once the dwell is greater than the time the pellet spends in the barrel, you gain nothing and just waste air....Bob
The gun is already keeping the valve open after the bullet leaves the barrel.
As was shown by the shot string I still didn't have enough hammer strike to produce peak power at 200 bar.
QuoteThe gun is already keeping the valve open after the bullet leaves the barrel.QuoteAs was shown by the shot string I still didn't have enough hammer strike to produce peak power at 200 bar.Those two statements are mutually exclusive, they cannot both be true, at least not at 200 bar (unless it is reopening due to bounce).... In fact, once the valve is open for 50% of the barrel length (at a given pressure), the velocity is within about 3% of maximum velocity (at that pressure), and approaching the plateau.... At that point, any shot string will be first shot fastest (at that pressure) and then declining as the pressure drops....What you are seeing when the valve opens more than 1/4 the throat diameter is NOT increased flow RATE, but increased dwell because it takes the valve longer to complete the (higher) lift cycle.... Therefore, the flow rate is clipped by the curtain (1/4 throat) limit, but the total flow VOLUME is greater because that (maximum) flow occurs for a longer time.... There are excellent discussions of PCP valve dynamics in the "Geek Gate" (Engineering- R&D) in the Machine Shop Gate....Bob