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What's In A Moderator?

Discussion in 'Anything Airgun Related' started by Kawasakiman, Nov 25, 2018.

  1. Kawasakiman

    Kawasakiman Member

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    OK, my question's not so simple as that. I've noticed that my best silencers have an acoustic wadding in them, and my worst ( in terms of noise) are pretty much empty. My question is, can you buy the acoustic wadding for the purpose, or is there something else that can be used in its place? As you can guess, I'm thinking that adding some wadding to my empty moderators would improve their performance. I'm open to any advice or suggestions
     
  2. Oat

    Oat Stick to your guns

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    Wadding is pot scourers... Yes seriously! :eek:

    Wadding alone will do very little, you need some baffles to redirect / slow airflow.
     
    Tim_B, Kawasakiman and cloverleaf like this.
  3. Kawasakiman

    Kawasakiman Member

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    Wow! That was quick :)

    I didn't realise it was that simple! I suppose it's just something to absorb the sound then, really, as long as it keeps out of the way of the pellet. Thanks for the pointer :thumb:

    (My moderators do have some baffles, but I was hoping some wadding would help)
     
  4. Carlos76

    Carlos76 Major Poster

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    People use hair curlers
     
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  5. mikeyhall1

    mikeyhall1 BRIT SEALS - M & M Products - TbT

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    Hair curlers, scotch bright and washers:thumb:
     
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  6. Rm29

    Rm29 Currently obsessed with silencers

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    This is in one of mine, metal bits are the baffles, the 'wadding' is just wool felt! Works a treat.. Normally 3 sections in a moderator. Large first chamber, smaller one then large again, but this will probably be different for each gun.. But it works best on all mine. DSC_0207.JPG
     
    Kawasakiman likes this.
  7. pjgtech

    pjgtech I shoot, therefore I aim......

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    As above, some moderators are empty, some have baffles or separate chambers and others have baffles as well as sound deadening / sound absorbing material, which can be any type of wadding, scotchbrite, scouring pads, felt, etc. As you say, its important that the pellet does not clip anything on its way through the mod... :thumb:
     
    Kawasakiman likes this.
  8. Kawasakiman

    Kawasakiman Member

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    . . thanks for all the suggestions, I can see I have some experimenting to do :hunting:

    I'll post my findings afterwards :)
     
    Fusty Fieldcrafter likes this.
  9. Carlos76

    Carlos76 Major Poster

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    Welcome to the forum matey
     
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  10. josh9465

    josh9465 Well-Known Member

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    What size holes in the baffles do the manufacturers make them.

    .177 baffle size is X mm?
    .22 baffle size is X mm ?


    .
     
  11. pjgtech

    pjgtech I shoot, therefore I aim......

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    Well .177 is roughly 4.5mm and .22 is roughly 5.5mm, so presumably a little bit larger than those?
     
  12. robs5230

    robs5230 Oversprung

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    Hair curlers and Jay cloths. I find the scotchbrite / scourers disintegrate after a time.
     
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  13. squib

    squib Keyboard Hero

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    Felt and curlers is a good start. These one are from Superdrug, 4mm thick felt from eBay. All packs inside a home made body for the ultra nicely, makes a big difference to the output.
    Have joined the 3 curler bodies together with small sections of tube, and the joint closest to the muzzle is tight to bore size and sealed to the inside of the outer body to try and catch some air and push it backwards.
    The whole lot ( minus sealing ring ) is wrapped in felt before fitting into outer body.

    If you read into silencer design, it’s a massive subject, with all sorts of big words. I don’t dispute any of it, but, for sub 12 pcp, I have found an approach of trying to direct the air sideways and backwards, while disrupting it along its route can make a massive difference.
    I don’t for a minute doubt any of the research or development into proper silencer design, but for sub 12 airguns? I think you are into what is known as the law of diminishing returns.


    797918B3-28A1-45A8-8463-C66CF9A482EA.jpeg

    5023DF00-9222-4A12-9D29-B09284186004.jpeg

    A73CA64F-1B24-4C82-8A5A-9FE60DD1BC3B.jpeg
     
    Kawasakiman and pjgtech like this.
  14. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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  15. Vard

    Vard Keyboard Hero

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    Get @squib and @Rm29 together .....
    Silencer obsessives :)
    Don’t think you will far wrong looking at the above :thumb:
     
    Kawasakiman likes this.
  16. secretagentmole

    secretagentmole Low down, dirty and quiet...

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  17. rkr

    rkr Keyboard Hero

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    Usually one mm extra allows for manufacturing tolerances not to effect things. 1.5mm if you want to play it safe. The hole size has actually very small effect to the dB peak but it moves the peak up and down in frequency. Small holes - peak at higher frequency - large holes - peak at lower frequency. Volume is the king, the more volume the more quiet the silencer (if properly constructed).
     
  18. Tadpole

    Tadpole Super Moderator Staff Member Mod/Admin

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    This may be helpful ..

     
    Kawasakiman likes this.
  19. monsta41

    monsta41 Donator

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    ive seen those videos before, i couldnt help thinking they all sounded the same, however with a pellet to add some air resistance he might have got better results
     
  20. Guloluseus

    Guloluseus Very Active

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    Everyone that makes mods will have their own suppression materials- think I could tell one made by @bl4de form 50 yards, in a good way :)
    Its not just the materials, its the spacings, the way it fits together, all those things. I did try a few experiments and found that certain exit holes were better than others- on my regal, a 6.2mm hole resulted in a quieter mod than a 7mm, which was louder than an 8mm. (not a lot in it, and it varies by gun, but shows that the size is less important as such than the overall setup.
    I have only just start making mine, as such, but have spent probably 6 months-year looking at how they work, material properties, mod lengths and diameters, and acoustic principles. after all that, I tend to think there are 2 ways to go- prove it with maths and hope you got it right, or pick something and wait for something better to turn up. both seem to be as efficient in the long run!
     
    Kawasakiman and bl4de like this.

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