Looks good to me - but I would have Burns do it in the thickest piece of 321
they have (which I think is .049). Also, the slip joint at the flange is a
good idea too - more like a necessary idea. Watch for places where you will
have differential vibration/movement. I.e. the engine is on rubber mounts
and moves independent of the fuselage - so if you support the exhaust on the
engine and on the engine mount/fuselage - you've go different movement. You
will need to de-couple the parts so they can move independent of one
another.

Joe Hull
Cozy Mk-IV N31CZ (65 hrs - Rotary 13B NA)
Redmond (Seattle), Washington

> -----Original Message-----
> From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
> Behalf Of Steve Thomas
> Sent: Thursday, September 07, 2006 5:29 PM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] Exhaust System - Comments?
>
> I have been lurking on this list for some time, really enjoying and
> learning from all of your experiences.  I'm the guy who has Mistral's
> serial number 001, two rotor normally aspirated engine.
>
> I just finished tacking this exhaust system together and thought that
> I'd ask for comments.  The current material is mild steel, but my
> plan is to take it to Burns Stainless (just down the road from me)
> and have them duplicate it in 16 ga.  321 stainless.  The collector
> is from Burns, as is the muffler.  If you can see the tacks, you'll
> be able to see why I'm taking it elsewhere.  ;-)  The header pipes
> are 2" and the combined pipe after the collector is 2 1/2".  This was
> recommended by Burns.
>
> After fabrication, I plan to have it coated with HPC HyperCoat
> Extreme as my design goal was to get the heat out as quickly and
> directly as possible and keep as much in the pipes as possible until
> it exits to atmosphere.
>
> The oddball bends in the header were designed to keep the header
> pipes the same length, which they are.  Given all the difficulty some
> have had with their exhaust systems, I'd thought that I'd throw it
> out there for comments.
>
> Best Regards,
>
> Steve Thomas
> SteveT.Net
>
> ________________________________________________________________________