Kral Arms A question for you "Unregulated PCP tuners"
- Thread starter Motorhead
- Start date
I’ve owned regulated guns in stock form that would have a higher ES than that. Out of curiosity, how much gap/ free flight is this rifle set at?
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I changed it up a bit from Troys typical, the inner spring now sits a tad longer out of the larger by @ 1/4"
This places free flight to the smaller spring @ 1/8" and @ 1/4" to contact the larger primary. Outer is a .500 od .052" wire x 2" and inner the same length tho never measured wire size.
The spring guide post was cut off all but the last 1/4", that allowed making a acetyl nub that i.d. of larger spring firmly slides over and sorta snaps onto. When hammer goes into free flight the primary spring stays attached to adjuster cap staying also centered.
Small inner spring is allowed to float, and it sits on top of this guide nub which sets it the 1/4" forward
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That's a phenomenal set up, but do be aware that your ES is likely closer to 39 than 29 (still great though!) . . .
You can see that it is likely that the peak speed occurs somewhere between 2750 and 2500 (and is probably coming down as it hits that value you show as the peak at 2500 psi). Add in that those are already average values of two shots at each point, and the ES clearly will be a bit higher.
I just point this out as these little things do matter in getting to an actual value. In the end, it won't impact accuracy at normal, ranges hardly at all - and we all know that many people pointlessly chase lower ES values than they really need, as though it is the goal that really matters (and maybe for them it is).
You can see that it is likely that the peak speed occurs somewhere between 2750 and 2500 (and is probably coming down as it hits that value you show as the peak at 2500 psi). Add in that those are already average values of two shots at each point, and the ES clearly will be a bit higher.
I just point this out as these little things do matter in getting to an actual value. In the end, it won't impact accuracy at normal, ranges hardly at all - and we all know that many people pointlessly chase lower ES values than they really need, as though it is the goal that really matters (and maybe for them it is).
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Ran some numbers today .... 70 shots on 400 psi = 5.71 psi per shot.
1200 psi sweet spot divided by 5.71 = 210 shots.
A lot more if one keeps blasting away correcting as it slows down ... slowly
1200 psi sweet spot divided by 5.71 = 210 shots.
A lot more if one keeps blasting away correcting as it slows down ... slowly
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@Bear-of-Grayling , I loved learning how you compensate for pressure with change of pellet weight/type
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