Revisiting the HATSAN AT-44 valve mods .... For a Regulator conversion.



Author Topic: Revisiting the HATSAN AT-44 valve mods .... For a Regulator conversion.  (Read 6808 times)

Offline Motorhead

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Offline rsterne

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Re: Revisiting the HATSAN AT-44 valve mods .... For a Regulator conversion.
« Reply #1 on: November 28, 2013, 10:10:17 PM »
Well done.... you should be all set for when you get your regulator....

Bob
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Offline Motorhead

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Re: Revisiting the HATSAN AT-44 valve mods .... For a Regulator conversion.
« Reply #2 on: November 29, 2013, 02:10:26 PM »
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Offline Motorhead

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Re: Revisiting the HATSAN AT-44 valve mods .... For a Regulator conversion.
« Reply #3 on: December 10, 2013, 05:44:29 PM »
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Offline Motorhead

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Re: Revisiting the HATSAN AT-44 valve mods .... For a Regulator conversion.
« Reply #4 on: December 11, 2013, 12:37:17 AM »
« Last Edit: December 11, 2013, 02:00:15 AM by Motorhead »
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Offline GARY T

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Any update?
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Offline Bwalton

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Looks like you went from 965 to 875 with the regulator, my mods were a little different...with out the regulator I tuned to 890fps for the AT,44 short....My mods were as follows..I plug two hole because the one did not line up, left 4 open..and went 3 1/2 turns out. With the regulator for 20 shots I got a  ES of 9 and a Avg of 824fps now...a whole lot less work. Same results or better, shooting 18.13gr , with 14gr I think it would be a much higher fps'...But with the 18.13gr you have more ftlb. Also Roy makes a very good regulator local no need to go outside the U.S
The Hatsan is very ez to tune. Bec even without the regulator, and just plugging two holes, I got a avg of 890fps shooting 18.13gr with a ES of only 13.
« Last Edit: June 28, 2014, 01:37:13 PM by Bwalton »
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Offline Conrad Smith

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Offline Conrad Smith

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Offline semad

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Forgive a newb question, but see if I am understanding this correctly.  after regulator install, adjust hammer for max velocity (plateau), then decrease till drop is noticed (knee)?  If velocity is lower than wanted, increase reg setting?   
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Offline Conrad Smith

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@semad My understanding is that you are correct. However, in this case, the hammer spring force combined with the hammer weight is just too large and I am at the limit in reducing the spring force. I think I have a few options. Increase the set point, reduce hammer weight, and/or cut the spring. I am going to begin with increasing the set point (currently at 1700, going to increase to 1900). I'm searching the internet for ways to reduce hammer weight. Seems harder than it looks. Plus I haven't figured out how to get the hammer out yet. LOL

@bigtinboat I agree, I need more power.

How do you word it... "Air Guns" or "AirGuns"?