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Hey, Bill!
Great find. Boy talk about a thorough investigation. Will take a bit to digest even a part of it, but it looks hopeful that their may be something I can use to quite this louder engine.
Ed
----- Original Message ----- From: "Bill Dube" <bdube@al.noaa.gov>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Wednesday, May 11, 2005 2:36 PM
Subject: [FlyRotary] More about Mufflers
For those that are interested in how to design a muffler:
http://naca.larc.nasa.gov/reports/1954/naca-report-1192/
This is very well-written paper and a thorough treatment for resonance type mufflers. They built 74 different mufflers and compared the measured sound attenuation with the theoretical attenuation. A lot of good information.
Homepage: http://www.flyrotary.com/
Archive: http://lancaironline.net/lists/flyrotary/List.html
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