How about audio products to dampen ping?

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  • #1629
    Anonymous
    Inactive

    Anyone tried anything like wrapping their tanks with Dynamat or Damplifer, maybe spraying them with a vibration killer? I dont know about you but alot of the noise from my Condor comes from tank ping.

    #34943
    bodhisdad
    Participant

    Alot of the ping is from the tank, its a big resonance chamber. I’ve thought to use something like a washer or two hanging from a string to break up vibrations. I think of it as atuning fork, where once struck if its touched with a finger the vibrations cease. Some have thought to spray the inside with a liguid rubber. Not a bad idea. I’d like to hear more about the products you’ve mentioned. Thats the only noise i have left on my rig. I’ll get around to trying something one of these days.

    #34947
    brushy-bill
    Participant

    Just curious, would a not too thick coat of truck bed liner on the outsite help? I am starting to build one of these. Sounds like this a common problem once the muzzle sound is eliminated.

    #34952
    brushy-bill
    Participant

    Bodhisdad quote,
    “I think of it as a tuning fork, where once struck if its touched with a finger the vibrations cease.”

    Looks like it being shouldered and against you cheek would stop the “tuning fork” effect. Just an observation.

    Seems like it would have to be the sound of the valve closing resonating inside the tank? and not the outside shell?

    Maybe coating the inside is the way to go.

    #34953
    pilgrim
    Participant

    I agree with Brushy Hill. With a tuning fork effect, the sound is generated by the tank and should already be dampened. As a resonance chamber, the tank is amplifying introduced sound. Think of a speaker cabinet. Even with coating the inside, you still would have a large chamber where sound could resonate. Perhaps some kind of sound baffles inside the tank would work.

    Also, I wonder if this is noticeable to anyone who doesn’t have their ear an inch from the tank.

    #34954
    pilgrim
    Participant

    Also, have you tried the nylon washers behind the tophat to eliminate that sound source?

    #34955
    shaky
    Participant

    How much would a nylon or rubber washer, behing the tophat, impact the energy or speed of the projectile? In other words, would you have to dial up the power wheel to compensate for the fore-shortening of the travel of the tophat???

    #34958
    synopsys
    Participant

    What ping?!?!? 😆

    Yeah, a nice snug fit nylon washer behind the tophat would really quiet the whole thing a lot! 😆 😉

    Hanging washers on a string inside the tank??? Then you would have to coat the inside of the tank with rubber so the washers wouldn’t rattle around… Also would you attach the string to the valve? There isn’t anything else to attach anything to in there…

    Baffles might work but if the density isn’t equal or greater to the tank material the tank will still ping, so foam is out, even a chunk of rubber is out since until it significantly changes the overall density of the tank you’ll get a ping… So you’ll probably end up losing a decent amount of internal tank space trying to fix this issue from the inside…

    I imagine a lot of the ping comes from the valve slamming closed under pressure and then that echoes throughout the tank… Softer contact materials will invite leaks, etc…

    Not to be a dick or anything but the ping may be something we will have to live with wether we like it or not… 😡

    #34965
    pilgrim
    Participant
    quote synopsys:

    Yeah, a nice snug fit nylon washer behind the tophat would really quiet the whole thing a lot! 😆 😉

    OK, I’m assuming that’s something you’ve tried and ruled out. Educate us please. , the echos through the tank is what I’m talking about:)

    quote synopsys:

    baffles might work but if the density isn’t equal or greater to the tank material the tank will still ping, so foam is out, even a chunk of rubber is out since until it significantly changes the overall density of the tank you’ll get a ping… So you’ll probably end up losing a decent amount of internal tank space trying to fix this issue from the inside…

    Actually the idea was to stop sounds waves within the tank. not the vibration of the tank material, so why does it have to be the same density as the tank material?

    quote synopsys:

    I imagine a lot of the ping comes from the valve slamming closed under pressure and then that echoes throughout the tank…

    Yeah, the “echoes” through the tank is what I’m talking about above. 😉

    #34967
    synopsys
    Participant

    I believe the tank is resonating and transmitting the sound through it’s material, I do a bit of acoustical design for sound studios and transmission is the enemy of making things quiet… The sound you hear is the frequencies that are not absorbed by the tank’s composition. In order to quiet these frequencies you need the correct material for each the various frequencies…

    If the outside of the tank was 3″ thick you would still hear the ping but not as much since the aluminum only slows or reflects certain frequencies… Yes the thicker tank will dampen more frequencies but some will still be just as loud as they were before because the density of the material is still constant.

    Say you make welded in aluminum baffles (hypothetical) these baffles will change the dynamic of sound transmission within the tank but the aluminum baffles will still transmit the resonance into the tank shell and the ping will still be there but it may be a touch different since it is being broadcast through the spot where the baffle contacts the tank wall as well as it moves through the baffles and hits the other end of the tank.

    In a studio to get good sound insulation you use air, sheetrock, fiberboard, fiberglass or rockwool insulation and resilient channels to provide isolation between layers of dampening materials, the source and the outside…

    The sound absorbing stuff someone mentioned previously would probably do the most but I wouldn’t hold my breath. There is a deadening composite that is rubber, tar, fiberglass and thin lead that may do the job but since it doesn’t address the specific frequency it may just add weight and then there is the issue of the end of the tank and the corners.

    The most difficult aspect of a sound room is sound sealing the viewing window, door and ventilation system…

    I was joking about ‘padding’ the tophat, anything solid behind it defeats the idea of the tophat, all you will do is reduce the action of the hammer-tophat assembly and lower your velocities… And in the process of limiting the valve movement you will dampen the ping but not without loss of power and repeatability…

    #34968
    brushy-bill
    Participant

    Quote from the Pilgrim,
    “I wonder if this is noticeable to anyone who doesn’t have their ear an inch from the tank.”

    Or their cheek bone against the tank.
    This got my curosity considering I have never squeezed the trigger on one of these rifles. (not yet anyway) When I shoot my AR-15 in a match, I hear the spring in the butstock. My cheek bone is solidly against tthe butstock and my nose is touching the left side of the charge handle. But I have never heard the guy’s thats shooting next to me.

    #34969
    synopsys
    Participant

    Good point Bill, I forgot to ad that to the post… 😉

    It would be interesting to hear it from a camera not attached to the rifle, I wonder how loud it is to those not right next to the whole assembly… 😯

    #34970
    Anonymous
    Inactive

    I dont know about getting any of this stuff to work guys but I can assure you the ping from my Condor is loud enough to be heard over both the hammer slap and the exhausting air. From at least a few yards away, my face doesn’t have to be planted on the tank. May be something I’ve just got to live with. Of course, I guess a hammer slap mod might tame the ping a hair also.

    #34974
    shadoh
    Participant

    Just get earplugs, it sounds like it would be allot easier.

    #34998
    knifemaker
    Participant

    Strangly I have never heard the Ping in my SS. But I have heard it in an FX. and Rapid, and Air wolf. It. Made me wonder if a dense foam sleave like is on our bottles would help theirs. I didn’t know folks were having the same problem with our set-ups.

    Mike

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