Jerry Hey wrote:

 I remember that fish tail mufflers did not hold up to the rotary's
 heat and energy.  Does anyone recall their affect on performance?
 If this restrictive termination of the 2 inch diameter exhaust pipes
 did not harm performance, than I believe a 3" tangential muffler
 without any restriction might perform very well.

 Jerry

Those were too simple. They must be beefed up. You cannot merely
squish the end of the pipe and call it a true fish tail muffler :-)

Paul Lamar

I'm not planning on using a fish tail, but knowing its effect on
performance would be very useful.   Jerry

I built several "fish tail" mufflers and finally wound up with one that
would last but it was just barely adequate in the noise suppression
department.  The power was not noticibly reduced.  Except for the aero drag
(mounted under the fuse) , the Spintech (www.spintechmufflers.com) is the
closest thing to optimum I've tried so far.  I'm going to try and clean it
up aerodynamically as soon as I find the time.  It costs me about 3 mph in
speed in its current form.

My guess about the "open ended tangential" muffler you described is that it
would be loud.

Tracy Crook
tcrook@rotaryaviation.com
www.rotaryaviation.com

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