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Perfect (as Can Be) Moderator Internals

Discussion in 'Technical' started by the dog, Aug 21, 2019.

  1. the dog

    the dog Petrol engines do NOT like diesel

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    To all you moderator makers.
    What in your opinion, is the best design for sub 12 moderator internals?
    How many baffles? Curlers and felt? etc...
    I'm thinking of doctoring my Uragan mod as its just a spring wrapped in felt material. The shroud it connects to is not much better. I'm sure both can be improved.
     
    Rincewind666 and Marky-Boy like this.
  2. RichieRich

    RichieRich Ping!

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    If you can wait, i'm going to make a set on the printer for mine when it arrives :)
     
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  3. the dog

    the dog Petrol engines do NOT like diesel

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    Cheers Rich.
    Yes I can wait. I will take you up on that mate. Thanks.

    I'm in the process of moving house. Once I find the right property, the first thing to buy is a lathe so I can tinker on the like.
     
    phil.m, Marky-Boy and RichieRich like this.
  4. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    Is the shroud just cosmetic or vented?

    :)
     
    Marky-Boy likes this.
  5. Ganton Gunner

    Ganton Gunner Super Moderator Staff Member Mod/Admin

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    well at the moment my internals are stuffed with Kebab :D
     
  6. Marky-Boy

    Marky-Boy Just The One + 1

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    What are you actually going to make
     
  7. RichieRich

    RichieRich Ping!

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    From what i've read, it's like the HW97 barrel end, just a tube with some felt and a spring. No baffles
     
  8. RichieRich

    RichieRich Ping!

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    Baffles MarkyBoy! Baffles :)

    I'll measure the internals, then make a set including the tubes to section it
     
    Blister, the dog and Marky-Boy like this.
  9. Marky-Boy

    Marky-Boy Just The One + 1

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    Stevie can I do anything to my shroud to make it quieter so I don’t need a mod?
    I was reading old threads earlier and you commented a lot
    Vented drilling holes?
     
  10. Marky-Boy

    Marky-Boy Just The One + 1

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    Sounds Tec Nic Cal
    Is it worth me putting any material before my baffles on my Vulcan or is that a waste of time?
     
  11. RichieRich

    RichieRich Ping!

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    I've no idea on the Vulcan i'm afraid, i've not seen one, so i'm not sure if its internals
     
    Marky-Boy likes this.
  12. Marky-Boy

    Marky-Boy Just The One + 1

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    I’ll take a pic next time thanks mate
     
    RichieRich likes this.
  13. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    In the 3 huma shrouds I have modified/vented, it has been an improvement every time with 6 x 2mm holes drilled just up from the breech block. The huma shroud has a back venting adapter before the baffling that redirects the blast back into the shroud, and works very well.

    The 4th huma shroud I modified had 6 x 2mm holes drilled just forward of the breech block, and the same drilled in the first baffles chamber, the result was louder at the shooters end but fly fart at the target end.

    The huggett belita isn’t particularly good because the vents in more recent models have been closed off:shrug:

    Open up the vents and voila, a better mod at the target end where it really counts.

    I understand not everyone wants to attack their shrouds and mods with a drill, but certainly have a play with different baffle arrangements and wadding. It could and probably will shave off a few db’s


    :)
     
  14. Marky-Boy

    Marky-Boy Just The One + 1

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    Thank you
    You have got me thinking
    Every day’s a school day
    Cheers Stevie
     
    Stevie Darling likes this.
  15. Thiel

    Thiel Donator

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    IMG_20190803_181441755.jpg IMG_20190803_181547328.jpg IMG_20190803_181522417.jpg IMG_20190803_181547328.jpg
    Vulcan gen4
     
    RichieRich and Marky-Boy like this.
  16. rkr

    rkr Posting Addict

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    Venting at the breech end works, I usually wrap a roll of thick felt around the barrel that extands to under those vents to slow down the blast. The same goes for first chamber vents. One of my HWs has 6 holes in the first camber and double layer of felt under those holes, it measures more quiet than a stock unit. For a shroud you want that backventing (several ways of doing it) + vet at the breech end and after that a normal 3 chamber system with felt and curlers would work well for 12 fpe. I have a 28mm CF shroud in my 12 fpe Scorpion, Huub style backventing and vent at the breech end, 200mm in front of the muzzle with 3 chamber system. It is very hard to tell if the gun has air in or not when you shoot it.
     
    Marky-Boy and Stevie Darling like this.
  17. rkr

    rkr Posting Addict

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    Marky-Boy and Stevie Darling like this.
  18. Marky-Boy

    Marky-Boy Just The One + 1

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    IMG_3767.jpg
    So if you filled these spaces with rollers/felt that would be ok?
    And something behind where it screws onto the barrel
    I think it’s tinker time
     
  19. rkr

    rkr Posting Addict

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    Yes, fill the spaces with felt and rollers. The piece that screws/pushes at the muzzle is fine as it is, it's the backventing piece that guides air from muzzle back through the shroud towards the breech. You should add some holes at the very rear of the shroud where it meets the breech and have some felt under them. That allows air to flow back through the shroud while greatly reducing the speed of it, thus leaving less air to go through the actual silencer piece of the shroud.
     
    Marky-Boy likes this.
  20. Marky-Boy

    Marky-Boy Just The One + 1

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    Thank you
    Can you recommend some felt?
    I asked another member by pm but don’t think he wants to share his trade secrets
     

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