Huma regulator break in period?

Jump to latest Follow Reply
Mink

Mink

Member
May 15, 2020
52
3
NY, United States
I recently installed a Huma regulator in my Taipan Veteran Long .22 because the OEM reg would occasionally give large extreme spreads (~30 fps). I set the Huma reg to 115 bar and installed it. Gun appears to work fine, holds air like before, etc. With the HST ~maxed, the gun will push 18.1 JSBs 950 fps or so, but I tuned the HST for optimal accuracy @ 880 fps.

When I started shooting with the Huma I noticed that after the gun sat for a while (overnight), my first few shots were significantly slower (30-40fps) than what I tuned it to shoot. After doing some research it sounds like most new regulators "creep" in pressure, and the higher working pressure makes it so the hammer cannot fully open the valve leading to slower initial velocities. But this regulator creep is supposed to dissipate after a break in period.

I have ~300 shots through the gun since installing the Huma and am still seeing this behavior. This was my cold bore shot string from today:

852, 861, 866, 863, 867, 870, 865, 875, 879, 880, 878



Do you think the reg is still "breaking in"?

Could this be caused by my HST being too light for the reg setting?

When should I start to worry that I received a faulty Huma (making me 0/2 on regulators for this gun )?

I would prefer not to have to dump 10 shots every time I see a starling...
 
I resently installed a huma reg in an mk1 FX bobcat. The bobcat has a gauge which read regpressure. Got it preset from huma at 115 bar. But that was in relation to what my old reg was set at, 110 bar, and what my gauge read. The gauge still read aprox 110 bar after install,but I wanted it a litle higher. So when I first shot a maybe 200-300 shots I then dismantled the gun, and adjusted up 10 bar on the scale on the reg. I then showed almost 130-135bar on the gauge, which was more than I wanted. Shot maybe 200-300 more. And then when I once shot below reg pressure and refilled the gun, it suddenly had dropped to like 120-125 bar. Now it seems stable, and is close to the pressure I wanted (maybe 5-10 bar higher), but the gun so far seems to shoot good. I probably adjusted my reg to early, as it did change by itself later.

I think your gun also needs more pellets trough it, as mine did, maybe 500 more? If you later are planing to adjust it, you might first try to shoot the gun below regpressure, refill, and see if it change some by itself as it did on my gun. In the mean time you might try adjusting the speed of the pellets up to around 900-920 fps on hammer spring, and see if speed of the first shots doeas not drop as much.
 
Upvote 0
"Could this be caused by my HST being too light for the reg setting?"

Maybe,,,, usually match the reg pressure to the velocity you want , then adjust the hammer spring to knee of your velocity plateau

also sticky hammers cause more ES when the hammer is adjusted lighter than the reg pressure , I like Hornady One Shot gun cleaner and lube, it does not leave an oily residue around your hammer
 
Upvote 0
Think the easiest step is to increase the speed of the pellet some first with hammer spring adjuster, to see if the ES improves. If the gun still shots good you can at a later stage try to lower it again. Or at a later stage lower the regpressure a tiny bit if you want to be in the 800`s, when you are sure it has enough shots true it. You then may have to chrony the gun again, to see if the max speed is the same as now.
 
Upvote 0
Have installed three Humas in the past year or so. Two in 2260 type platforms and one in a PRod. Would get a random significantly high or low fps every 20-25 shots when they were new.. This eventually stopped after a few refill cycles on the airtube. Now the only anamoly experienced is the occasional low velocity (by about 25-30 fps) for the first shot or two if the gun has been inactive for a few days or more.

No big deal. I'm satisfied with Huma.






 
Upvote 0
Hello, I installed the Huma reg on my Taipan Veteran long .22 caliber about 2 weeks ago. I am seeing the same issues as you regarding the extreme spread. I don't have my gun perfectly tuned yet but what I'm noticing is the velocities tend to be affected by the fill pressure as well. How it's affected depend on whether the hammer spring tension is too light or too heavy. From my experimentation and data recorded, being really low on the velocity compared to the maximum is too light of a hammer strike. As a matter of fact, I was testing the rifle at around 95% of max velocity and the "first shot syndrome" was still present and as I said before, fill pressure was also affecting it. Right now, I've set my HST to give velocities of around 97.8% of maximum. I can't comment with knowledge yet but my initial tests seems positive. I am keeping the tune for now and I would be recording velocities of the shots I take from day to day.

My gun's specs: Huma reg at 100 bars. Maximum Velocity 979 FPS. HST tuned down to 957 FPS.

What I would recommend is setting your HST for velocities of around 930 FPS and see if that helps.
 
Upvote 0
I don't know if this is true for other guns as the Veteran is my only PCP but it seems the hammer spring tension adjustment on my gun has a really tight sweet spot on the knob for a given reg pressure. Within around a quarter turn off the knob. Too much and it's at the plateau and too light, the extreme spread goes up from less than 15 FPS in the sweet spot to 25+ FPS outside the optimum.
 
Upvote 0
Although I can't comment specifically on the 18.13gr because I'm turning mine for the 15.89gr Hades, my experiences with it should give you a better idea regarding the FPE. I've taken the gun apart already multiple times to replace the stock reg and then to find tune the Huma. The stock reg came set from the factory shooting the 18.13gr at 1004 FPS at 150 bar reg pressure. When I initially installed the Huma, I had it set to 120b and the max with the Hades is at around 1030 FPS. I re-adjusted reg to 110b and maxed the Hades at 1000 FPS. I now currently have the reg set to 100 bars and the max velocity is 979 FPS. So I'm my case about a 25 to 30 FPS difference between 10b pressure change of the regulator. You can use an FPE calculator to extrapolate the data to your needs. If I have to take a guess though with your setup, and taking in to account that heavier pellets will have a little more power from the same setup as a lighter pellet, you're probably looking at between 100 and 105 bars on the reg. 105b will probably have your final tune shooting your 18.13gr pellets at a little over 900 FPS. You really might want to be closer or right at 100 bars.

My current setup is 100b reg, 979 FPS max speed at 33 FPE. HST tuned down to 957 FPS.

Please take what I'm saying with a grain of salt. I'm only just learning as well and I know it's such a pain in the butt adjusting the reg on this gun especially if you hand pump. I don't want you to go through all that trouble only to turn out that I was wrong.
 
Upvote 0
Doing some more calculation, for my Hades, it's about a 1 FPE difference per 5 bars on the reg. You're at 37 FPE max now. Your goal is around 33 FPE (910 FPS for 18.13gr) max velocity. You're at 115b now so it might be best between 95 and 100 bars on the reg. Keep in mind that this is assuming the adjustments are linear between different pellet weights and different setups.
 
Upvote 0
Doing some more calculation, for my Hades, it's about a 1 FPE difference per 5 bars on the reg. You're at 37 FPE max now. Your goal is around 33 FPE (910 FPS for 18.13gr) max velocity. You're at 115b now so it might be best between 95 and 100 bars on the reg. Keep in mind that this is assuming the adjustments are linear between different pellet weights and different setups.
Click to expand...

Thank you for that explanation! After some research I found Huma documentation that states that a 10 bar change in reg pressure equates to roughly 10 m/s = 33 fps change in velocity. So that aligns with your findings. 


My next move is to take the gun down and set reg to 100 bar and see if consistency is better particularly on cold bore shots. 


A side question: What is the recommended way to remove the reg itself from the air cylinder? To install it I slowly pumped air in the removed tube until the reg “popped” out from the pressure. Not sure if this is the best way...
 
Upvote 0
You must log in or register to reply here.
Top Bottom
Back
Home
Forums
Resources
Menu