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Dear Fred
Look at my web site you will see what you are talking about it was made but never tested out. techwelding.com.
Regards
Ed Klepeis
----- Original Message ----- From: "Fred Osborn" <fosborn@infowest.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Saturday, June 30, 2007 10:35 AM
Subject: [FlyRotary] Noise
Yes, a long taper, a fish mouth, or a fish tail cut at the end of the exhaust pipe will help break up the harmonics and resonances of the exhaust pulse. Not a lot quieter but definitely more mellow.
Fred O.
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