Regulate a Texan

Huben Power makes a whole line of AirForce regulators. They now have a product that will work with big bore. It has a 120CC plenum so you should not lose as much power from regulating. Primarily for Condor/Talon but it just connects up to your existing valve m18 fitting. There will be some loss of power, 120CC is less than the volume of your barrel so the pressure will drop once the plenum is exhausted.

man that looks especially for 257 or 357..but a 457 or 50 uses a lot of air.Some day someone will make one that will us full power but it will need quite a bottle on board

jasperjet said:

man that looks especially for 257 or 357..but a 457 or 50 uses a lot of air.Some day someone will make one that will us full power but it will need quite a bottle on board

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Yeah, someone needs to fill those barrels with water and measure their volume. I used to know the math for that kind of stuff but my last math course was 50 or so years ago.

I guess you could tee in a 0.22L or 0.30L bottle at the valve, after the regulator, and use that as a plenum. Use a tee, extension and 90 you could run it parallel to the stock or frame.

jasperjet said:

trajectron which I believe is based in india has regs for texans and many othrt parts..my antivirus stood up and blocked the because of their authenication but they got bit now.

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Yes, India, I've bought quite a few parts from them for my Talon and Condor remakes. They ship DHL and usually arrive in 4-5 days. They have a lot of parts for other rifles too, like FX.

jasperjet said:

trajectron which I believe is based in india has regs for texans and many othrt parts..my antivirus stood up and blocked the because of their authenication but they got bit now.

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Your right, they are in India and I have ordered many parts from them, high quality parts and now they have made their own pcp.

357cal said:

Your right, they are in India and I have ordered many parts from them, high quality parts and now they have made their own pcp.

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Talon, Condor, Texan probably the most comprehensive collection of AF parts & upgrades.
Love their hammers & springs (although I have my own collection of AliExpress springs now)

SpindleB said:

Yeah, someone needs to fill those barrels with water and measure their volume. I used to know the math for that kind of stuff but my last math course was 50 or so yearsgo.

I guess you could tee in a 0.22L or 0.30L bottle at the valve, after the regulator, and use that as a plenum. Use a tee, extension and 90 you could run it parallel to the stock or frame.

Click to expand...

I've been playing with plenums for a few months now and a friend with a .510 Texan asked if it is possible to regulate with a large plenum.

I did the math and a .510 with a 34 inch barrel has a volume of 114cc. Optimal plenum would be 3x or 4x barrel volume.
350-450cc would be a good starting point.

Turns out the best I have available is a 40cmx28mm tube which is about 250cc.
I built it up and tested it on a .25 Condor with a 24 inch barrel, high flow valve and heavy hammer. It was impressive. Regulator set to 1500psi and I was getting almost 900FPS with Barracuda 30.86gr pellets.

Don't know when I'll get to try it on the Texan (500 miles away) but if I change out the regulator to a Huben Max-ATH it will add 50cc to 300cc it should work pretty well.

Was able to run the 40CM tube along the body of the Condor. It is possible to add more tubes either in parallel or a 20CM tube in series. Parallel would add another Tee to the arrangement.

All done with COTS parts except two custom M18 male to male adapters.
Shan Bao 40CM tube with M18 adapters
M18 F-F-F Tee
M18 M-F Elbow
M18 plug
2 custom M18 M-M adapters
Regulator of choice
Bottle - 1.1L Acecare Fat

The fun part getting it clocked and tight.
Various thickness PTFE 16mm washers, 1mm, 2mm and 3mm
16mm bonded washers.

Whole thing weighs right at 5lbs.

Big issue right now, the 40CM tube is unavailable on AliExpress due to tariff fun and games. Hopefully it will be back during the current hiatus.

Ratzy said:

I've been playing with plenums for a few months now and a friend with a .510 Texan asked if it is possible to regulate with a large plenum.

I did the math and a .510 with a 34 inch barrel has a volume of 114cc. Optimal plenum would be 3x or 4x barrel volume.
350-450cc would be a good starting point.

Turns out the best I have available is a 40cmx28mm tube which is about 250cc.
I built it up and tested it on a .25 Condor with a 24 inch barrel, high flow valve and heavy hammer. It was impressive. Regulator set to 1500psi and I was getting almost 900FPS with Barracuda 30.86gr pellets.

Don't know when I'll get to try it on the Texan (500 miles away) but if I change out the regulator to a Huben Max-ATH it will add 50cc to 300cc it should work pretty well.

Was able to run the 40CM tube along the body of the Condor. It is possible to add more tubes either in parallel or a 20CM tube in series. Parallel would add another Tee to the arrangement.

All done with COTS parts except two custom M18 male to male adapters.
Shan Bao 40CM tube with M18 adapters
M18 F-F-F Tee
M18 M-F Elbow
M18 plug
2 custom M18 M-M adapters
Regulator of choice
Bottle - 1.1L Acecare Fat

The fun part getting it clocked and tight.
Various thickness PTFE 16mm washers, 1mm, 2mm and 3mm
16mm bonded washers.

Whole thing weighs right at 5lbs.

Big issue right now, the 40CM tube is unavailable on AliExpress due to tariff fun and games. Hopefully it will be back during the current hiatus.

View attachment 563104

Click to expand...

Went a different route
Added a u adapter and a 20CM tube.
All totaled about 400-425CC of plenum.
Tophat in the middle
40CM off the tee along the body
20CM off the tee to the regulator and U.

Jorgo said:

How much plenum volume has an airforce ?

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Stock, around half a liter ;-)

Berserkeley Mike said:

Stock, around half a liter ;-)

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That is just the unregulated bottle.
What do you get, 2 or 3 shots per fill?

I think i can get a 1.6L bottle on there.
That would be more than 2L of regulated air.

With the tilt down adapter I'm guessing you could put a 2L bottle on.