From: "Neil Unger 12348ung@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: Exhaust setups
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Date: Tue, 12 Nov 2019 08:29:51 +1100
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Gun suppressors are simply a tube with multiple baffles in it with the 
center holes just bigger than the projectile.  Then remember there is 
only one shot to silence at a time.   Again I am guessing, but it seems 
that the stock exhaust header does silence the noise some what as well.  
I know of a set up that uses the stock manifold into a muffler and is 
does a great job in noise elimination.  The manifold I am cutting down 
weighs almost  10 pounds, (with the end cut off). so while this weight 
is significant, it i appears to be good "value"

Mat, no consolation, but I also have a perforated tube sitting in my 
shed destined to be the final "quietener" on my setup,  (aka Paul Lamar) 
but you have saved me the trouble as it obviously does not work.  It 
would appear that a muffler made of inconel with internal baffles like a 
rifle silencer may be simplest.  Baffles made like multi blade impellers 
to swirl the exhaust as apparently "rubbing" the gas will help quieten 
the noise.

Heat in exhaust.  Mat I spent years worrying to death about take off 
heat at 1800 degrees as I had an exhaust gas temp sender.  My mate had 
no such probe and flew for years in bliss as to exhaust gas temps.  When 
he finally pulled his engine down, it was perfect as to any damage due 
to hot EGT.  This however, is a worry for a turbo.  Supercharger 
eliminates this worry, but I need the "muffler" effect like we all do.  
All compromises as usual.

Neil.

On 11/12/2019 7:28 AM, Thomas Mann tmann@n200lz.com wrote:
> I would really like to hear from someone like a gunsmith who has 
> experience in the design and construction of suppressors.
> They typically devoid of any packing to collapse/blow out.
> As I recall, Al Geitzen had a similar setup on his 3-rotor.
> https://www.youtube.com/watch?v=zxIKDnYZE24
> T Mann

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    <p>Gun suppressors are simply a tube with multiple baffles in it
      with the center holes just bigger than the projectile.  Then
      remember there is only one shot to silence at a time.   Again I am
      guessing, but it seems that the stock exhaust header does silence
      the noise some what as well.  I know of a set up that uses the
      stock manifold into a muffler and is does a great job in noise
      elimination.  The manifold I am cutting down weighs almost  10
      pounds, (with the end cut off). so while this weight is
      significant, it i appears to be good "value"<br>
    </p>
    <p>Mat, no consolation, but I also have a perforated tube sitting in
      my shed destined to be the final "quietener" on my setup,  (aka
      Paul Lamar) but you have saved me the trouble as it obviously does
      not work.  It would appear that a muffler made of inconel with
      internal baffles like a rifle silencer may be simplest.  Baffles
      made like multi blade impellers to swirl the exhaust as apparently
      "rubbing" the gas will help quieten the noise.</p>
    <p>Heat in exhaust.  Mat I spent years worrying to death about take
      off heat at 1800 degrees as I had an exhaust gas temp sender.  My
      mate had no such probe and flew for years in bliss as to exhaust
      gas temps.  When he finally pulled his engine down, it was perfect
      as to any damage due to hot EGT.  This however, is a worry for a
      turbo.  Supercharger eliminates this worry, but I need the
      "muffler" effect like we all do.  All compromises as usual.</p>
    <p>Neil.<br>
    </p>
    <div class="moz-cite-prefix">On 11/12/2019 7:28 AM, Thomas Mann
      <a class="moz-txt-link-abbreviated" href="mailto:tmann@n200lz.com">tmann@n200lz.com</a> wrote:<br>
    </div>
    <blockquote type="cite" cite="mid:list-13165204@logan.com">
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        <div>I would really like to hear from someone like a gunsmith
          who has experience in the design and construction of
          suppressors.</div>
        <div>They typically devoid of any packing to collapse/blow out.</div>
        <div> </div>
        <div>As I recall, Al Geitzen had a similar setup on his 3-rotor.</div>
        <div><a href="https://www.youtube.com/watch?v=zxIKDnYZE24"
            moz-do-not-send="true">https://www.youtube.com/watch?v=zxIKDnYZE24</a></div>
        <div> </div>
        <div>T Mann</div>
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