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Thanks to all for your responses. I will do the slip joint at the flange as you-all suggest. I also plan to do a slip joint just after the collector. And, the muffler is mounted on rubber bushings. Bob, yes, I bought the whole package, including the reduction unit. I'll keep you-all posted on my progress with the exhaust setup. Best Regards, Steve Thomas SteveT.Net ________________________________________________________________________ On Sep 7, 2006, at 9:40 PM, Joe Hull wrote: 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 ________________________________________________________________________ -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/