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  1. #46
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    "The NASA Shaped Sonic Boom Demonstration, also known as the Shaped Sonic Boom Experiment, was a two-year program that used a Northrop F-5E with a modified fuselage to demonstrate that the aircraft's shock wave, and accompanying sonic boom, can be shaped, and thereby reduced. The program was a joint effort between NASA's Langley Research Center, Dryden Flight Research Center at Edwards Air Force Base, California and Northrop Grumman.

    The program became, at that time (2003 according to Supersonic transport), the most extensive study on the sonic boom. After measuring the 1,300 recordings, some taken inside the shock wave by a chase plane, the SSBD demonstrated a reduction in boom by about one-third."


    https://en.wikipedia.org/wiki/Shaped..._Demonstration

  2. #47
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    "The ground noise is expected to be around 60 dB(A), about 1/1000 as loud as current supersonic aircraft. This is achieved by using a long, narrow airframe and canards to keep the shock waves from coalescing."


    https://en.wikipedia.org/wiki/Quiet_...nic_Technology

  3. #48
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    Fast forward to 22:00 in this video. He demonstrates how ultra high BC bullets have much less air disturbance downrange.

    Basically the right powder with the right projectile can reduce the initial sonic crack as well as reduce the down range air disturbance (noise) levels.

    Eventually they will have ultra high BC bullets that are injection molded out of certain polymers of various densities. Combine that with good gun suppression, the right powders and it's possible to reduce the sound signature of the entire gunshot, not just the boom on the end of the gun by quite a lot.


  4. #49
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    I'm a nerd. I know, I know. :) I prefer to identify as 'smart' though. HAHAA!!

  5. #50
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    Joelski, you canít run it in your AR but subsonic expanding 223 exists.

    http://beckammunition.com/ammunition...-subsonic.html

    And Iím over here wearing double earpro...

  6. #51
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    Quote Originally Posted by fledge View Post
    Joelski, you can’t run it in your AR but subsonic expanding 223 exists.

    http://beckammunition.com/ammunition...-subsonic.html

    And I’m over here wearing double earpro...
    I can vouch for Beck Ammo. The two boxes I shot made me a believer. There are a lot of options out there.

  7. #52
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    Here is more information on the development of the 'low boom' sonic flight technology. Apparently that's the cutting edge for the time being. But they have already proven that you can drastically reduce the sonic boom of a supersonic object.

    Gulfstream X-54 project is designed to make supersonic air travel possible. They are figuring out how to reduce the sonic boom of airplanes and bullets both.

    https://en.wikipedia.org/wiki/Gulfstream_X-54

  8. #53
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    Quote Originally Posted by fledge View Post
    Joelski, you canít run it in your AR but subsonic expanding 223 exists.

    http://beckammunition.com/ammunition...-subsonic.html

    And Iím over here wearing double earpro...
    http://atomicammunition.com/ammuniti...yclingSub.html

    Sent from my SM-G930P using Tapatalk

  9. #54
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    Quote Originally Posted by Joelski View Post
    So, related, but OT, what's a relatively quiet (-ish?) Off-the-shelf round for .223/5.56? I know the key to taming the noise level on my blackout is grams; no such solution for the smaller pill, so is there a "less noisy" alternative that us non-reloaders can take advantage of?
    You are looking for a quieter 5.56 round to shoot out of a standard carbine? I don't think your going to get very far on that journey.

  10. #55
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    Hence the .300 BLK love. Chive on.
    There's no "Team" in F**K YOU!

  11. #56
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    I'm still thinking that an 18in Barrel Plus my Alpha with 223 end cap will be, at the very least less noisy, which is something/better than nothing, and probably pretty close to as good as it gets.
    There's no "Team" in F**K YOU!

  12. #57
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    Quote Originally Posted by Joelski View Post
    I'm still thinking that an 18in Barrel Plus my Alpha with 223 end cap will be, at the very least less noisy, which is something/better than nothing, and probably pretty close to as good as it gets.
    18 inch barrels are the best overall length for suppression. It provides the right amount of pressure for most suppressors to be able to tame down. The shorter the barrel the higher the pressure blast. If you have a semi auto you still have to contend with chamber pop which is still kind of loud. There are however bullet and powder combos out there that CAN give you a slight DB reduction but aside from the Hornady SBR ammo I mentioned above I've never seen any commercial ammo making those statements.

    It's scientifically possible to do, just not something that has been pursued by most as far as I know.

  13. #58
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    Quiet .223 is labeled 22LR.

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