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From: Lehanover@aol.com
Message-ID: <1d6.312cac15.2edf93c3@aol.com>
Date: Wed, 1 Dec 2004 16:38:11 EST
Subject: Re: [FlyRotary] New Muffler Design
To: flyrotary@lancaironline.net
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In a message dated 12/1/2004 10:12:42 AM Central Standard Time, 
sqpilot@bellsouth.net writes:

<< Hi, Ed....funny you should mention that....I was just considering ordering 
a 
 Supertrapp disc muffler which sounds somewhat similar to what you are doing, 
 with the exception that it just attaches to the rear of your pipe.  The one 
 that I am interested in is the 3" diffuser disc unit, as seen on 
 www.http://recerpartswholesale.com/supert2.htm   One of my concerns, however 
 is how well it might hold up, as any parts/pieces of a failed unit would go 
 through my prop (pusher configuration), effectively cutting my flight short 
 and/or ruining my day.  Good luck with flight testing, etc.  Please keep us 
 posted.  Paul Conner 
  >>

I recommend ordering two extra sets of diffusers for the Super Trap. It will 
kill the power, but does cut down the noise. When we ran at Charlotte Motor 
Speedway we had to add on of those to get down to 105 dB. There is nothing to 
absorb sound at that track. A NASCAR race must be amazing to hear. I think those 
things started out as a spark arrestors for diesel trucks used in National 
forests. 

I think a conical shape in the exit would have been less of a drag than the 
flat plate, but we never went back, so I didn't work on it anymore.

Lynn E. Hanover