LDC

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  • #973
    buba-b
    Participant

    This is one for all the none US TAG,ers , as im still confused if its alright for the US to see this , let alone make it 😀 hehe. Got this from a Ruski site ,seen the idea before but the designs have always been way to complex to make . This looks like an easy solution to stopping the air flow arfter the pellet . Uses .10 mm feeler gauges for the pettals as the Ruskies call them and seems to work .





    Waiting for the holidays and i may have ago ! . Didnt know if this should be in the new section or not , 😕 move if so ! k 😀

    #28933
    shadoh
    Participant

    In the US its ok to see, post, talk about and even use this type of thing. You just cant own one for a firearm unless you get the license for it. Airguns is a gray area.

    Its not illegal on them as you can buy one with one already installed from an airgun dealer. You just cant own one that can be removed and put onto a firearm.

    Evan after saying all that who knows what our government will decide to do on a whim. They can twist the laws to anything they want to.

    #28935
    walkonking
    Participant

    How does it work?

    #28937
    buba-b
    Participant

    Very Grey area lol! we all love grey areas dont we 😯 .It works by when the pellet passes through the crown of the barrel the air behind the pellet fills out to the inside bore of the LDC and slows down. This air travels slower than the pellet , therefor the pellet passes through the pettals and the following air at lower speed / pressure closes the pettals making a “tyk-f-f-f-f-f” noise , so the poster says. Have to try it too see 😀

    #28946
    shadoh
    Participant

    I had thought about doing one with a flap that would move over the exit hole after the pellet went by. I was always worried that it would someday get stuck closed and I would have no way of knowing about it until the next shot.

    #28993
    mcmike
    Participant
    quote Buba b:

    It works by when the pellet passes through the crown of the barrel the air behind the pellet fills out to the inside bore of the LDC and slows down.

    I would quess that the after the pellet has gone the following pressurewave just closes the “gates” enaugh to make air exhaust slower. Very clever idea. Please share your experience if you’re going to test it.

    It could work even better if the gates are made from appropriate rubber-hose. The overpressure outside has more surface and will seal the hose after pellet is gone. After pressure escapes somewhere (second port) the hose will restore it’s original shape. You could even add a piston for it. So that the other end of hose is connected to axially moving piston which bends the hose and seals it. Spring would return it to original shape or with correct material strengh it can work as spring by itself.
    Hmm.. lots of interesting experiments for future here 🙂

    I think I will definetelly test this after other some projects are finished 😉

    #29031
    buba-b
    Participant

    Heres some pics of the pressure wave following the pellet, as you can see the pressure wave flows out to fill the bore of the tube.



    There are loads more ideas on the site involving sliding gates , pistons, rotary gates which spins with the air flow ,spring loaded pettals and the flap that Shadoh mentions but as i said they all looked way to complex to make for what it dose . The one above at least looks like it could be made simply and easy to test out.


    Good luck with your idea mcMike , this is as close to your idea that i found !

    The brown area being rubber tube which closes under pressure fead through the holes

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