----- Original Message -----
From: "Peter Cowan" <cowcam@pipcom.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Saturday, December 21, 2002 4:39 PM
Subject: [FlyRotary] Re: ROTARY POWERED ZENAIR ZENITH


>
> > Here is a more recent photo of my CH-200. (Nov-Dec 2002)
> > Note exhaust installation. These are SS flexible pipes. The shortest
> (upper)
> > is 31 inches long from exhaust port to oxygen sender. The lower one is
4.5
> > inches longer.
> > This exhaust arrangement provides more engine power and also much more
> > exhaust noise.
> > Yvon Cournoyer.
>
> Yvon, where did you buy the stainless? I'm amazed that it is holding up so
> close to the engine. How many hours on these pipes?
> Peter

Allo Peter
Thank you for your questions. They made me realize that my photo is very
misleading. Allow me to correct.
But first: SS flexible exhaust tubing available from J. C. Whitney. at:
www.jcwhitney.com
The photo does not show this but up close to the engine, my exhaust is made
of industrial type water
pipe from Canadian Tire. 2" o.d. Thick wall steel and heavy but long
lasting.
I used the Racing Beat exhaust flanges as a model and made up a 3/8 or 1/2
inch thick
steel flange to which are welded the first pieces of  2" o.d. water pipe.
From there the other pieces are screwed in: nipples, lenghts and bends, 45
and 90 degrees bends, as needed. From the exhaust flange going down and
rearward, I
have about 12" long of these bends and pipes. The 2" i.d. flexible SS
tubings slip over the last 4"  of pipes and is held in place by the exhaust
temperature probes and their clamps.
So the flexible SS tubing is protected by the steel pipe and is not directly
exposed to the exhaust until about 12" from the exhaust port. I have only a
few hours of use on this  configuration, but I am hopeful that it will last
reasonably long. I have
used the water pipes since I began flying my Zenith in 1990. They are very
long lasting.

Yvon Cournoyer.