Joe Hull
Cozy Mk-IV N31CZ (65 hrs - Rotary 13B NA)
Redmond (Seattle),
Washington
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of the mallorys
Sent: Friday, August 25, 2006 1:41
PM
To: Rotary
motors in aircraft
Subject: ***SPAM*** [FlyRotary]
Exhaust system
I've looked back through the archives, and seen lots of
different ideas for exhaust systems. But no real definitive answers.
There is the Cool tube exhaust that has very short
pipes,like Bob White posted.
There is the medium length, no muffler system like Buly has
or like Joe Hull has mocked up.
There is the really long tubes with muffler hanging under
belly like Tracy
has.
Do we know what the correct length tube is to tune the
exhaust for our RPMs? Does this length include the muffler?
It appears the diameter most used is from 1.5 to 2".
What about the different mufflers? I only found two
mufflers named in the archive that guys are happy with, the Flowmaster
Hushpower II, and the Moroso Spiral Flow Racing Mufflers. Last year at
Shady Bend, Monti talked about noise levels and testing different mufflers and
pipes. Are there ant results from that?
I'm ready to start mocking up my exhaust, so am seeking the
collective wisdom of the group.