Plenum for the Diana Skyhawk/ Artemis P15 (.22cal)?

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JungleShooter

JungleShooter

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Sep 5, 2018
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Plenum for the Diana Skyhawk/ Artemis P15 (.22cal)?

I have a Skyhawk .22 with a LW choked barrel, and a Huma regulator installed by the former owner (AoA might have done the work).

Now, I’m considering getting an extended plenum. And I’m stumped: 



Going to the Huma website I see they give you two options:
(a) Buy just a regulator (85€)
https://www.huma-air.com/Artemis-P15-tuning-pressure-regulator
(b) Buy regulator with a plenum extension (for only about 12$ more, 95€)
https://www.huma-air.com/Artemis-P15-Power-Tune-Regulator-XL-Plenum-Set



After webmailing Huma their answers were a little terse and counterintuitive, but IF I understand them correctly: They sell two Diana/P15 regulators, and they are different. Their plenum for the regulator – option (b) – does not work with the Huma regulator that I have – option (a). That seems counterintuitive – why would they design a regulator, and then just to slap on a 12-dollar plenum, they’d design a whole new regulator?
❓ QUESTION 1: Can maybe someone explain or confirm this?




❓ QUESTION 2: So, what other options are there to get an extended plenum? Sorry, I can’t send the gun to some tuner, it’s on another continent...! :)



Thanks for your help!

Matthias


 
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Do you search somerhing like this?

Mine is around 70cc with pressure gauge.

Set to 135 bars i Can push h&n 27 grains more than 300m/s 
 
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Hi!

Any news regarding to this topic?

I´m shooting at 820 fps with 25.4gr, all stock.

A friend of mine with a lathe helped me with the barrel and now is a tack driver.

I´m wondering putting an huma with plenum or only a plenum, but I want to know the maximum vel achieved by you.

890 fps would be great, but I don´t know if only with a plenum would be enough.

Thanks!

Martin
 
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You should definitely do the Huma with the bigger plenum. Set the reg at 150b and turn the hammer screw in until it won’t cock, then back it off a quarter turn. This is the max your gun will do. It should be in the 850-870 range. You could get lucky and it might be a little more. Now running your gun like that looks nice on the chronograph but it’s not the most efficient tune. Back the gun off 10 or so FPS from the max you can get so it isn’t an air hog. You also have to hope it’s still a tack driver at your new dream velocity. Bottom line is the .25 needs a bigger plenum anyway so just do it and take what it gives you. 
 
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My P15 in 22 with factory regulator shot jsb 15.9 around 850ish with Lee545 10cc plenum installed I was getting 900+fps with 15.9 pellets, in my P15 there's a ridge in the air tube that won't let you screw it flush with the valve connector when I put Lee's plenum in but that's just cosmetics doesn't make it unsafe but I'm thinking of getting a Huma Reg for it as the factory one started acting up after sitting a couple of months.
 
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I just replaced the o-ring on the airtube this afternoon, so this week I finally get to see what power the gun can deliver with a Huma turned up all the way to 150bar, and the hammer spring tensioned pretty much all the way in for a slug or heavy pellet.



Also, the H&N slugs and FX slugs arrived in Peru yesterday — so I'm super excited to see if I can find one that will shoot well!! 😄



And then I'll decide if my power addiction will make me buy the Huma extended plenum, or not..... 🤔



Matthias


 
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I just replaced the o-ring on the airtube this afternoon, so this week I finally get to see what power the gun can deliver with a Huma turned up all the way to 150bar, and the hammer spring tensioned pretty much all the way in for a slug or heavy pellet.



Also, the H&N slugs and FX slugs arrived in Peru yesterday — so I'm super excited to see if I can find one that will shoot well!! 😄



And then I'll decide if my power addiction will make me buy the Huma extended plenum, or not..... 🤔



Matthias

Click to expand...

I finally got a semi working chronograph and tested my .22 cal to see why I was getting inconsistent results. Turns out my factory reg is set about 155 bar. My skyhawk shoots the 18.13gr JSB to 880ft/s with the hammer spring 1/4 out from max for 44 really consistent shots before the reg pressure falls off and then the speeds are all over the place. With the same settings it pushes the FX hybrid 22grain to 800ft/s.

SPA has calibrated this gun to only have enough air to shoot the 18gr JSB. I'm convinced that there's not a reg setting that could overcome the 10cc of regulated air limit without using a heavier hammer spring. Then we risk running into more issues from slamming the valve so hard.

I need to disassemble my gun and either turn down the regulator and stick with hades or throw on a plenum and move to slugs. Not even sure the barrel will shoot slugs accurate yet. Has anyone confirmed this?


 
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Broken_WV_Guy,

thanks for the albeit discouraging, but still helpful heads-up! 😊



🔶 Power

You're getting 31FPE with both the JSB 18's and the FX 22 slugs — mmmh. 🤔

I've been getting that kind of power with JSB 16's and 18's already at 130bar (with HST about 3.5 turns out) — and sure, that was with the Huma reg.





🔶Shot Count

I get a lot more regulated shots than 40-some, I don't have the figure right here, but I counted I think seven or eight 8-shot magazines, so around 60 shots per max. fill.



Where did you get the pressure reading of 155bar? Gun's gauge? Pump gauge?





🔶Slugs

Don't know what the OEM barrel can do. Some are very accurate, but others not so...., the previous owner of my gun put a JSAR LW drop-in barrel on it, so I have hope.

Though my first slug tests weren't great.... ➔ however there were some factors that might have thrown off my groups, so I'll need to try again.



Matthias


 
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