Mailing List flyrotary@lancaironline.net Message #44656
From: Tracy Crook <tracy@rotaryaviation.com>
Sender: <rwstracy@gmail.com>
Subject: Re: [FlyRotary] Re: Muffler design (was 20B isssues . . )
Date: Tue, 6 Jan 2009 11:52:00 -0500
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Interesting stuff Ernest,  Hope this turns up some good results.

I haven't had time to really go into muffler theory so I've just observed what the car & motorcycle makers do.  Based on these observations only,  I've concluded that unless we come up with a new concept, there is no substitute for size and cubic inches.  There is also a very important issue of muffler volume to outlet area ratio.   My 70 HP ATV has an unbelievably small outlet and works very well.  I'm going to try different size outlets on the -4 installation and see what I can learn.

Tracy
  

On Tue, Jan 6, 2009 at 10:12 AM, Ernest Christley <echristley@nc.rr.com> wrote:
Al Gietzen wrote:
Unless I did the math wrong; the maximum filling fraction you can get
 with these rods is about .8.  So I think there would be a problem there.

 
Well, I've worked out a way to put together a simple experimental bench-top apparatus that will allow me to quickly put together various crystal arrangements.  I've got some recordings of rotaries running.  I'll set up a configuration, pipe the recording into one end, record it on the other, and then do a spectral analysis on the new recording.  Running the analysis on a recording without the intervening filter will be my control.

Now that I'm excited.  I've got to try to get some work done. 8*)

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