Huben pistol.

[FLgunner]

It may be possible, if the gap is predictable and the same from one pistol to the next. Probably depends on how close a gap you want nominally?

I modelled the pistol from dimensions provided to me by IMADMAN. Dimension I did not have, I assumed for the sake of appearance. So, if I am provided the distance from the base of the air tank to the shroud front face, I can model what you seek, with perhaps a 1 or 2 mm gap. The gap in my model is 6.35 mm or .25". Everything looks larger, when you zoom in on it.

I have the adapter supplied by Kelly @ Kraz Kool, so the moderator snugs up flush with the front of the shroud. The distance between the front of the air cylinder and the front edge of the shroud is 11.5mm. The front sight height is 3.5mm, so may have to allow clearance for it so it doesn't interfere with screwing it onto the adapter.

 

[weevil]

I know what makes the impulse so good. Could easily do a DFL insert to mimic the impulse. By easily, I mean after the other project I have started are completed, or written off as failures.

That would be very interesting to try. Can you tell us what you think makes the impulse so good in this application?

 

[subscriber]

That would be very interesting to try. Can you tell us what you think makes the impulse so good in this application?

The slant angle on those cones is around 20 degrees, included angle. This works well to scoop up air very well, regardless of whether the air has a high bulk pressure but is moving forwards comparatively slowly; or if the air is moving fast because it has already expanded, and thus has less bulk pressure left.

The second factor is the spacing between baffles. They are far enough apart for the air flow to follow the back of the cones, rather than taking a shortcut from one baffle bore to the next. Visualize a troop of monkeys swinging swiftly between closely spaced monkey bars; compared to bars that are spaced too far apart for the motion to propagate; forcing the monkey to drop off and walk some distance on the ground, before reaching the next monkey bar.

More hints, starting with the last sentence of the second paragraph:
https://www.airgunnation.com/threads/choosing-the-correct-size-moderator.1296366/post-1566050

 

[weevil]

The slant angle on those cones is around 20 degrees, included angle. This works well to scoop up air very well, regardless of whether the air has a high bulk pressure but is moving forwards comparatively slowly; or if the air is moving fast because it has already expanded, and thus has less bulk pressure left.

The second factor is the spacing between baffles. They are far enough apart for the air flow to follow the back of the cones, rather than taking a shortcut from one baffle bore to the next. Visualize a troop of monkeys swinging swiftly between closely spaced monkey bars; compared to bars that are spaced too far apart for the motion to propagate; forcing the monkey to drop off and walk some distance on the ground, before reaching the next monkey bar.

More hints, starting with the last sentence of the second paragraph:
https://www.airgunnation.com/threads/choosing-the-correct-size-moderator.1296366/post-1566050

Many thanks for the hints and explanations. I’d love to learn more but I guess we should respect the fact that this is a general GK1 thread. It might be useful to start a separate GK1 moderator thread, given the context of need, diversity in form and application and the fabulous progress that you, TTTM and others are making (and validating)

 

[weevil]

I just had an email from my supplier indicating that the Huben mod adapters were messed up by over anodizing. They offered (and I accepted) a version in which the anodizing was removed from the threads. I already have one from Zach so I’m considering modding the new one to vent back to a tube surrounding the barrel, to implement a working shroud. Is that worth doing (subscriber, TTTM etc) or would it be a better use of my time to improve my recipe for squirrel vindaloo?

 

[JungleShooter]

I would second the opening of a GK1 silencer thread....
There are just too many posts to wade through.

Thanks,
Matthias


PS:
Maybe with a brief summary what has been accomplished and tried, test results, etc.

 

[weevil]

Since I suggested it (and it was endorsed by Matthias and several thumbsups) I figured I better do it. So here it is:

Huben - GK1 - taming the bark

This is a fork of the main Huben GK1 thread intended to provide further discussion related to taming the rather loud bark of this incredible pistol. Mod adapters have been provided by Ares, Kelly@KrazCool and now Huben themselves. I have tested a wide range of commercially available mods and...

www.airgunnation.com

I added a basic summary and my own recommendation of the Impulse Air. It would be great if others, particularly our wise and wonderful design and printing gurus, could provide a summary of where they are at. If it doesn’t take off and turns into a dud thread, I can delete it. The ball is in your court, fellow GK1 enthusiasts!

 

[JungleShooter]

I appreciate the fork-off to concentrate on silencing the GK1.


AGN is such a great place. Mainly because of people like you in this thread.
Matthias

 

[subscriber]

I just had an email from my supplier indicating that the Huben mod adapters were messed up by over anodizing. They offered (and I accepted) a version in which the anodizing was removed from the threads. I already have one from Zach so I’m considering modding the new one to vent back to a tube surrounding the barrel, to implement a working shroud. Is that worth doing (subscriber, TTTM etc) or would it be a better use of my time to improve my recipe for squirrel vindaloo?

There is not much volume between barrel and shroud; and the bottom of the shroud is open; so I think the rear venting system would be louder to the shooter's ears. IMADMAN has proposed a fully functional shroud for the Huben pistol. I told him; one thing at a time

 

[subscriber]

I appreciate the fork-off to concentrate on silencing the GK1.

Fork-off sounds like a spoonerism. I have been told that spooning leads to forking

 

[JungleShooter]

@subscriber,
if you’re going to knife my admittedly invented fork-word by calling it spoonerism, I have no recourse but follow the monkeys we used to see in the trees behind our house: no silverware at all — just hands.

Matthias

 

[weevil]

I was thinking of a carbon tube around the barrel inside the shroud but in reality, the Impulse air is quiet enough for me. Anyway, I’ll fork-off with this discussion.

 

[andrewjohnfx]

Added a couple things:

1) Gold dust cover for fill probe.

(*good preventative measure to keep fill probe in gun to avoid dust getting in fill port.)

View attachment 384962

View attachment 384960

2) Hawke Bubble level

View attachment 384961


This range bag I got at walmart is now my dedicated gk1 bag. Fits the pistol perfectly.

View attachment 384963

That probe plug looks great!! Where did you find that gem??

 

[Pale_Rider]

That probe plug looks great!! Where did you find that gem??

Amazon.com

 

[andrewjohnfx]

Amazon.com

Thank you sir! Appreciate it. This is my first PCP so enjoying the learning curve. I didn't realize until just now that you kept the fill probe in and just capped it off. I was looking everywhere for a dummy machined fill prope lol.

 

[wimpanzee]

I was looking everywhere for a dummy machined fill prope lol.

like this?


View attachment huben_fill_plug.zip

 

[andrewjohnfx]

like this?
View attachment 389366

View attachment 389365

Exactly, but I like the idea of just leaving the fill probe attached to the gun now. Thanks for the link

 

[Nomadic Pirate 66]

Things are looking up,...sold 5 guns and a good chance for a local sale tomorrow,so a couple more and I can justify the Huben pistol.

For you guys that have been checking it out, is there any .25 in stock anywhere ?

Thanks

 

[IMADMAN]

There is not much volume between barrel and shroud; and the bottom of the shroud is open; so I think the rear venting system would be louder to the shooter's ears. IMADMAN has proposed a fully functional shroud for the Huben pistol. I told him; one thing at a time

Unfortunately my scale crapped out so I’m unable able to weigh the shroud. There is a lot of weight and mass there for just being basically a cover with a front sight and 11mm dovetail. Ideally a redesigned cover with intergraded sound suppression, front sight and a built in picatinny/ weaver style base is what’s in my head.

 

[Jimcking]

@subscriber I printed your 8 1/2" moderator. It sounds a little quieter than the 5" version. Technically it should be about 2 dB quieter. 3 dB is suppose to be the minimum detectable change in sound level detectable by the human ear and is about 1/2 the power.

I am on a trip now and will not be home for another couple of weeks. Will run some tests when I get back.

Thanks for the design.

Jim K.