vulcan .25 unstable velocity !!
Nice to be with you guys, and hope to learn more.
Three months ago, I got my .25 vulcan tactic.
I screwed the hammer spring adjuster a little bit in, and was shooting at 920 FPS.
everything was ok, but for the past two weeks I have noticed some changes. So, I checked the velocity.
Filled to 250 bars, the gun shoots at 910 FPS.
When it reached 170 bars, it dropped directly to 870 FPS.
and when it gets to 150 bars, it goes down to 840 FPS.
Refilled and done the same steps again, I will always get the same results.
Is it the regulator? shall I take it out and check the o-ring!!
What do you suggest!!
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This post has been a good read and learned a lot reading it.
if you look at the locking nut,it has that polygon shape. The flat side between the ‘corners’ is approx~20bar, half of it is 10 bar, thats how I remember it. you have to mark the top brass bit rotational position with a vertical thin line best is to mark the main regulator body with a similar line too so you have reference points.
To unlock: you hold the main regulator body with a large adjustable spanner, then you unlock the locking nut with another spanner by turning it anticlockwise.
To adjust: – to lower the regulator output you turn the brass bit in deeper clock wise. this decreases the gap between the needle and seat.
Hold the brass bit while you are locking the nut back in -if you dont it will turn with it.
to increase the reg output you have to turn the brass out, so the total length of the regulator body will get longer. internally the gap will get bigger.
simple
:8:
Edit: it seems there are 2 different seats out there. Flat and round. The round is higher so the total leng of reg will be different too. It seems there is also different brass needles out there. With hole across and without. Also the reg body’s can be aluminium not black anodised and black
I just had a similar failure. Was down to small o rings. one the piston, looked square not round crossection anymore, and another one on the brass needle, it seems these go first. replaced both. :8:
she is now shooting 920FPS with low HST
tested accuracy, I can shoot ants eyes out :4:
:hoot:
Excellent!
Now that’s a gun you can be proud of! Maxed to the max…now, find something to shoot!
Hoot:
readjusted the regulator.
she is now shooting 920FPS with low HST
tested accuracy, I can shoot ants eyes out :4:
Thanks, dearest ol’Uncle Hoot!
I’d like to, but currently I’m in the country of fermented hop and malt.
Well, not that bad neither, I’ll stick to it and hope Kris will be better soon to join in for the drinks.
They – at least – go downrange even without hammer spring!!! :rofl: :fishinghole:
Wish y’all a nice evening and keep it goin’
Cheers
this is not fecking airgunnation, or are we all going to solve everything with adjusting the hammer spring? like they do? hell no!
:rofl:
Sorry, one too much
Seriously, I well understand what the post is about, maybe “sticky” is not the right term, but this kind of simple, but useful information should be conserved somewhere central and not get lost in a specific thread, don’t you think?
Cheers, and one more on your “santé”
:hoot:
No need for an apology Pop’s….Read under Kris’s icon, and you can see that he just got out of the Fuxing Sanatorium, where he was being treated for mental issues resulting in Erectile Dysfunction. He’s still kinda groggy from the overdose of Viagra they had to administer to get his “Brain to Dick Interface Switch (BDIS)” pushed and locked back into operating position.
He’ll be ok in a day or two! In the meanwhile, you just keep on chugging that fermented vinegar you guys like so much over there.
Kind regards,
Uncle Hoot:
:rofl:
Sorry, one too much
Seriously, I well understand what the post is about, maybe “sticky” is not the right term, but this kind of simple, but useful information should be conserved somewhere central and not get lost in a specific thread, don’t you think?
Cheers, and one more on your “santé”
Papa schulz, stop drinking. this thread was NOT about balancing the reg and hst. It was a reg failure.
just trying to maintain clarity. the OP adjusted reg and replaced some o rings at the same time, so we never learned which of the 2 it was.
HST just right makes end of regulated segment remain almost flat until end of regulation.
HST low, you see the regulated segment climb and then drop after coming off regulation.
Now, this is short and clear :8:
Admin, I think this should be made a sticky, clear explanation of the relationship between HST and regulator.
Thanks Guykuo
I really dont know where the problem was.
I just cleaned everything, all internal and external o-rings were changed.Then adjusted the regulator several time until I got the desired velocity.
Full service indeed guykuo… he made a brand new regulator out of an old one.
nice video.
That was interesting that’s for sure.
Take a look at this video. Now THAT is a full service on a regulator! Hope not to need all this for quite a while, but nice to know.
Nice, good stuff. so was it leaking past the o rings on the reg piston or did you adjust it? did you replace the o rings and turned the brass at the same time?
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I tried shooting antidepressants in mine, but it didn’t seem to help stabilize anything!
You’ve gotta try…you never know till you try!
Kindly ‘Ol Uncle Hoot