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Date: Tue, 08 Mar 2005 22:23:24 -0500
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Anechoic Muffler
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Ed Anderson wrote:

> No, Tom, I had not see anyone use the disc configurations that I used 
> which were "designed" to appear solid (more or less) to the sonic wave 
> but permit gas flow through them.  I have seen discs with holes used  
> but they permit the sonic FAW wave through as well as the gas.  At 
> least that is my assumption.  If you recall the discs looked like 
> paddle wheels with the blades bent less than 45 deg.  The idea was 
> that it would still look pretty solid to a sound wave but the gas 
> molecules could find plenty of room to go around the face of the 
> blades and continue the flow.
>  
> I think the idea has sufficient merit to try it one more time without 
> spinning discs to see what the results would be.  Ok, I've shown you 
> mine now its your turn to show me yours {:>)
>  
> Ed A


Ed, would the disc work well in conjunction with a tagential muffler?

I still have about 2/3rd of the .050 stainless sheet left.  It only took 
a weekend to weld up my last experimental muffler, and I've been 
planning a tagential muffler design.  The only difference was that my 
plan to pump air down the cool tube vs just letting it be sucked in.  
Yes, you guessed it.  Shape the muffler like a jet exhaust.   NASA has a 
jet engine design applet.  Pump enough air to get the exhaust temps down 
to 1000 degrees, and the applet shows about 30lbs of thrust.