Mailing List flyrotary@lancaironline.net Message #44671
From: Ernest Christley <echristley@nc.rr.com>
Subject: Re: [FlyRotary] Re: Muffler design (was 20B isssues . . )
Date: Tue, 06 Jan 2009 21:19:16 -0500
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Ernest Christley 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.

Al G
  
I'll have to do the math, but I think it can be quite a bit more with a hexagonal packing.

http://en.wikipedia.org/wiki/Sphere_packing

The  math was to much for me, so I turned to Wikipedia.  The maximum filling fraction of close packed circles is about 0.9069.  Close enough to 0.907. 8*)
I would say that even though it would provide the best signal attenuation, I don't think a 0.907 filling fraction would provide a very useful muffler.

--

http://www.ernest.isa-geek.org


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