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PostPosted: Mon Apr 29, 2013 10:11 pm 
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Joined: Fri Jul 16, 2010 4:09 pm
Posts: 1029
Location: Southern canada
I've been looking at around at regulators for my at44 but not sure what's good and what isn't.

My intentions are to have a very accurate 600-650 fps pal rifle (10gr .177 pellet), that has lots of shot per fill. Full power is just to loud for me! I hoping that between a regulator and a valve stem that I can meet my goal with this rifle. Thanks

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PostPosted: Mon Apr 29, 2013 10:38 pm 
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Location: Coalmont BC
A regulator is a good choice for your intended FPE level.... I would suggest you PM Voltar1.... Why go outside of Canada when one of our own CAF members makes regs?.... He can probably recommend the output pressure you need as well....

I haven't played with an AT44 in .177, but I'm thinking that plugging the bottom 5 holes in the valve would be a good place to start.... with the hammer spring preload at minimum (full CW).... If the velocity is still too high, then try a larger stem or a sail (or less reg. pressure).... If it's too low, try opening up the top hole in the valve to match the transfer and barrel ports.... If you still need more, only then increase the reg. pressure....

Bob

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Airsonal;
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PostPosted: Tue Apr 30, 2013 2:49 am 
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Thats good advice from Rsterne.

And X2 on Voltar1. He will sort you out!

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PostPosted: Tue Apr 30, 2013 4:57 am 
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Joined: Fri Jul 16, 2010 4:09 pm
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Location: Southern canada
Thanks guys! I've tried PMs to the locals here but with no response. I'd love to keep my cash in Canada and not have to by from across the world!

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PostPosted: Tue Apr 30, 2013 1:36 pm 
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Joined: Thu Mar 15, 2012 6:38 pm
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Location: Near London Ontario
Walter has contacted me about one - I'm sure he's so busy making them that he is not able to respond :D

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PostPosted: Tue Apr 30, 2013 5:11 pm 
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Location: Southern canada
Well I'm just waiting to hear back from "audrius" to see if I can get some of his regulators, I really want a reg so I can get this project on the road.

Has anyone here use or used an audrius regulator?

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PostPosted: Tue Apr 30, 2013 10:03 pm 
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Location: Near London Ontario
Knapp, keep me posted on how it goes!

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PostPosted: Wed May 01, 2013 6:59 pm 
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Joined: Wed Apr 10, 2013 7:00 am
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I'm Hoping that a regulator will give me the consistincy I'm looking for, so I'm Looking for wisdom /advice from Bob, trying to sort out my Pnuema .177 I shot these strings today, I think I get the “knee”.

String 1

hammer screw all the way in

1034
1042
1049
1043
1043
1049
1049
1037
1050
1044
1041
1038
1032
1031
1021
1012
1005
1003
994.5
991.5

ES 58.58
SD 19.15

String 2
2 ½ turns out

1028
1028
1039
1039
1044
1049
1037
1046
1053
1036'
1046
1043
1032
1033
1027
1021
1020
1017
994.6

ES 58.75
SD 13.60

So If I understand the '”knee” of both strings is at 1050/1053. and seeing ad we're looking for consistency, string 2's SD of 13.60 is better. Like Chewey, while waiting for one of Walter's regulators, I have picked up an Altaros. These strings will provide an unregulated baseline. The reg. Should be here Fri (as well as a spare air tube) so after the weekend I should have some regulated strings for comparison. All shots were with CPD 10.5s (I tried 8.4.JSB Exacts, but the first 10 shots were all supersonic, and so not neighbor friendly) Charlie


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PostPosted: Wed May 01, 2013 8:57 pm 
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Location: Coalmont BC
Whe I refer to the "knee" I'm talking about a regulated gun, and plotting velocity (of 2-3 shots, no need to shoot a string) vs. hammer spring preload.... On an unregulated PCP, you are looking for a "bell-curve" shape (actually just a curve) for the entire shot string.... Most people only count shots within about a 4% ES, as more spread than that and the POI changes at 50 yards.... If you're shooting at 75 yards, you need about a 3% ES, and a 100 about a 2% ES.... At 25 yards, you can use all shots within about 10% of the peak velocity....

It's interesting that the velocity of your first shot went DOWN when you increased the preload on the second string.... that's the reverse of what you would expect.... Did you fill to a slightly lower pressure on the first string?.... Just based on the velocity of the first shot compared to the peak, you would appear to have too much hammer spring preload, or you could use a slightly higher fill pressure (assuming you can do so safely, of course)....

Bob

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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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PostPosted: Fri May 03, 2013 4:49 am 
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Joined: Fri Jul 16, 2010 4:09 pm
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Location: Southern canada
So I've finally got a hold of a regulator builder, and the question I'm being asked is. The what output pressure do I want? That's a really good question, in which I can not answer.

All I know is that I'm trying to send a JSB heavy(10gr / .177) down range at about 650 fps. Any and all help is appreciated? Thanks guys

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PostPosted: Fri May 03, 2013 10:12 am 
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Joined: Sat Nov 03, 2007 4:19 pm
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Location: Coalmont BC
At what pressure did your AT44 shoot just above that velocity on the low pressure side of the shot string.... ie if you kept shooting until the velocity was, say, 700 fps.... That would be the minimum pressure you can use for the regulator, where the velocity is about 10% above what you want.... Just a rough rule of thumb for the minimum.... The higher you set the pressure on the regulator, the fewer shots you will get and vice versa.... If you have the pressure way too high, you will have to detune the hammer spring a lot.... and then the velocity will actually INCREASE below the setpoint.... If the regulator pressure is too low, you won't get the velocity you want, or the gun will at a minimum be wasting air.... Balancing regulator pressure vs. hammer spring is every bit as important on a regulated gun to get the velocity you want with a good shot count....

Having said all that, you are looking at relatively modest performance, so I'd try 90-100 bar, assuming it is user adjustable....

Bob

_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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PostPosted: Fri May 03, 2013 4:25 pm 
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Joined: Fri Jul 16, 2010 4:09 pm
Posts: 1029
Location: Southern canada
Thanks resterne

I just ordered my regulator, $69 euro to my door. That about $95 Canadian! I hope this a descent product, and it give me descent results.


Here the email I sent to for an enquiry, then purchased from

regulatorpcp@gmail.com ( off the top of my head, I can't remember his name) I'll list it when I can.

Maybe one day I'll have a Canadian regulator to compare it to.....

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Benjamin Trail NP
Webley Alecto .177 (Custom)
Smith & Wesson 686
Hatsan AT44MW-10 .177
Daisy 953S


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PostPosted: Fri May 03, 2013 6:29 pm 
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Joined: Fri Jul 16, 2010 4:09 pm
Posts: 1029
Location: Southern canada
Audrius is the name.......

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