Uragan 0.22 Problem

[IRBR]

Hi All

I have strange problem ,Uragan 0.22 with Huma Reg dropped speed after plenty of time

i chrony it and speed average was ~275 m/s

after 2 weeks when i used again ,the speed average dropped to ~266m/s !!

reg pressure is 135 bar (default Huma co.) 

tank pressure are always above 150 bar

any suggest?

 

[Macros]

Only time mine ever did something like that I'd failed to properly tighten the grub screw that locks down the hammer spring tension adjuster and it had backed out a tiny bit. The uragan one is quite sensitive to minor adjustments/shifts I've found.

If it's consistent then reg issues seem unlikely. Is your chrony string flat?

 

[IRBR]

I've checked hammer spring position visually ,maybe very small movement that i can't detect

it seems that tension adjuster is locks down

Is your chrony string flat? very unlikely

 

[Macros]

No idea what you mean by 'very unlikely'? 

I meant your shot string over the chrony in case you are misunderstanding me. Has extreme spread increased/become erratic or is it still consistent? Is it showing a bell curve? 

Visually inspecting the hammer adjuster is unlikely to provide reliable insight. Try a slight increases in hst and see if that improves things.

If that fails you'll need to provide more info regarding the shot string to see if your reg has a problem.

 

[IRBR]

Sorry marcos ,i mean chrony string was flat

all shots are consistent but in lower speed,with increase hst 1/8 speed reach ~275 m/s,but hst position definitely changed,is it possible hst became weak in term of time?

 

[nervoustrig]

It could be that the hammer spring has taken a slight set, sure...it doesn't take much to produce an observable change in the velocity. A 9mps (~30fps) change in velocity is more than I would expect however, unless it is a valve design that is extremely easy to knock open.

More likely I would say that the regulator has settled in. As the seat wears in, the setpoint can be expected to shift upward slightly which will require a bit more hammer strike to knock open the valve.

Could be something else but I wouldn't worry about it at the moment. Perfectly normal to need to tweak the state of tune after having shot it a bunch.

 

[Macros]

I'm not sure to be honest. I suppose it might have settled a bit but the hammer spring shouldn't really be stressed to the point where it takes a set  

Another thing to consider is whether your new Huma reg might also have broken in at a pressure slightly different than it was initially. 

If it's shooting well and consistently after the hammer adjustment I'd just keep an eye on it and see if things stay put. If power starts drifting again then there's a problem to be solved.