Mailing List Message #65320
From: Neil Unger <>
Subject: Re: [FlyRotary] Exhaust setups
Date: Mon, 11 Nov 2019 17:46:42 +1100
To: Rotary motors in aircraft <>


                  not good to show all, but first shows the manufacture of the primary muffler.  One inlet to center tube from front, and the next two inlets to the side of the muffler.  Then the second shows the full setup although behind the heat shield.  It is ":bearable", hence the desire to go turbo to assist with noise, and then a muffler. 


On 11/11/2019 2:17 PM, Matt Boiteau wrote:
What are you guys running for exhaust? The thing is stupid loud and can barely talk on radio. Headset is LightSpeed wireless Tango's. Their ANR does not work well with the pitch of the rotary. Will try a Bose headset tomorrow.

I have 2.5" exhaust leaving the cowl. (ex1.jpg)  It comes down and centers the bottom of the plane into a 4" outer pipe. (ex2.jpg) The 4" outer pipe (5ft long) is open to the free air and exits behind the rear bulkhead. The 2.5" converts to a 3ft long perforated pipe (ex3.jpg) and exits inside the 4" outer pipe. For fun, I filled it full of ceramic fiber insulation mat, which did help a little until it blew all out.

- Matt Boiteau

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