I found something relevant to the exhaust noise and muffler problem. I found an aircraft I've never seen before, a Lockhead YO-3 Quiet Star which was used as an observation aircraft in Vietnam flying unheard at just 200 ft. It used a slow turning prop and a very thin fuselage as well as a very long muffler seen here. Would a muffler running the length of the fuselage and enough exhaust pipe ahead of it to allow EGT to cool along with a heat shield to keep unwanted heat out of the cabin work?


Ken Cohagen

They made a rotary version of this.

Yes.

Looks a lot like our coax muffler :)

Paul Lamar

The Rotary Engine News Letter. Powered by Linux.
ACRE NL web site. http://www.rotaryeng.net.
You Tube http://tinyurl.com/beqqxas.
Copyright 1998-2013 All world wide rights reserved.