REFLECTOR: Exhaust noise

[David Rene Dugas]

Cutting the end of the exhaust stack at an angle on one half of the end so it is not square decreases the noise.  So half of the opening is at 90 degrees with the pipe and the other half is at some angle of at least 15 degrees off.  This is not optimal for tuned exhaust and power recovery but much less noisy.
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On Jul 13, 2012, at 11:17 AM, Scott Derrick wrote:

> I'm using a Custom Aircraft exhaust which is fairly similar to the factory supplied exhaust. Basically a 3 into 1 stack for each side with the outlet pipe pointing straight down.  The factory exhaust joins  the 3 together under the forward cylinder. The Custom exhaust joins them under the middle cylinder.
> 
> I got a noise ticket(warning) in the mail from the KSMO operating authority last month.  They have a 95db limit that they somehow monitor.  They said I put out 95.1 db on one of my departures that day.
> 
> Anybody else experience this? Any solutions?
> 
> Scott
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