Airgun Technologies Vulcan 3 HP .25 max fpe?

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Hobbyman2007 said:
This is what I check when I have inconsistent values . Chrony, then hammer spring , then regulator pressure. If those check out. I move onto leaks from transfer ports, around barrel, breech seal and probe . If those check out it’s time to move to a deep clean of the action. I’ve seen all kinds of debris and gummy substances inside my guns. I don’t use any oils in my actions as I find temperatures will affect hammer strikes with changing temps.
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Done and done. Not my first rodeo.
 
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Will74 said:
I'm forced to determine reg setting from combination of fill system and the bottle gauge. The Wika helps.
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would you please explain how you do that, i have no reg. tester and so far have been flying pretty bling with it, and still am trying to find a reasonable tune for the ammo i want to use.

sorry to read, that you are still struggling with the rifle. i do not think anything i can say would be helpful, but to answer the max. power output with my .30cal V3HP below's a cheapo chronograph reading, from when i first tested my self made NOE boattail slugs.
the chrono is set slightly off to 4.30g, but it should be 4.315g = 66.6gr.
still, 326 Joules were more than i had expected. obviously nothing for useful consistency or accuracy. but OMPH!, as you called it.
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grouch-o said:
would you please explain how you do that, i have no reg. tester and so far have been flying pretty bling with it, and still am trying to find a reasonable tune for the ammo i want to use.

sorry to read, that you are still struggling with the rifle. i do not think anything i can say would be helpful, but to answer the max. power output with my .30cal V3HP below's a cheapo chronograph reading, from when i first tested my self made NOE boattail slugs.
the chrono is set slightly off to 4.30g, but it should be 4.315g = 66.6gr.
still, 326 Joules were more than i had expected. obviously nothing for useful consistency or accuracy. but OMPH!, as you called it.
View attachment 548750
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That's exactly why I insist on finding the upper limit and to recover missing energy. I remember your post. That's just amazing.
Everyone knows there's quite a bit difference between .25/.30 so I wouldn't expect past 200J in any circumstance.

I think we should meet up and share our findings. Both chronies in a row because I bet there are members in denial.
I can easily drive 100 to 200 miles. I remember You live somewhat near Me.
 
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Hobbyman2007 said:
Is it possible that the hammer spring has taken a set and is not hitting the valve as hard? From my reading the new V3 has a conventional valve vs. The balanced valve from the V2. That could explain the loss in FPE. I should add, that’s still a lot of power from a .25 cal. I’d be pretty happy with it from just the output and conventional valve.
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Hobby -

You need to pick up a book on coil spring design !
It takes a "LOT" more abuse to make a hammer spring, in an air rifle, loose any notable tension. That is unless it's just garbage from the beginning.

Mike
 
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MikeVV said:
Hobby -

You need to pick up a book on coil spring design !
It takes a "LOT" more abuse to make a hammer spring, in an air rifle, loose any notable tension. That is unless it's just garbage from the beginning.

Mike
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I don’t need to read any book to tell me that when you first receive a spring it is best practice to compress it to coil bind. This sets the spring. This has been done for the last 100 years in almost any application. Thanks for the tip though.
 
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inconsistent velocities is not from a hammer spring problem that much is certain. I would be looking at the regulated pressure. If there’s no gauge , you’ll need to add one. If you have a regulator on an external source like on an SCBA tank use that to eliminate the onboard regulator. But if you’re saying your rifle used to put out X speed and now only puts out Y speed and is consistent it’s not a problem with the regulator per se. But it could be the reg has settled at a higher or lower pressure. Which would require hammer spring adjustment.

I have seen in a few instances on my own air rifles where I was hitting the valve too hard. This would cause the valve to bounce shut reducing velocities and swings in velocity.
 
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Hobbyman2007 said:
inconsistent velocities is not from a hammer spring problem that much is certain. I would be looking at the regulated pressure. If there’s no gauge , you’ll need to add one. If you have a regulator on an external source like on an SCBA tank use that to eliminate the onboard regulator. But if you’re saying your rifle used to put out X speed and now only puts out Y speed and is consistent it’s not a problem with the regulator per se. But it could be the reg has settled at a higher or lower pressure. Which would require hammer spring adjustment.

I have seen in a few instances on my own air rifles where I was hitting the valve too hard. This would cause the valve to bounce shut reducing velocities and swings in velocity.
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That's good stuff.
I could make a dummy reg to seal the reference hole and fill the bottle to different readings.
Not exactly regulated but close enough for couple of shots.

I do believe it's all about the regulator. Unfortunately AGT didn't care for that stuff. It's not feasible at all to try and install reg gauge on a V3 :(
Thanks
 
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