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The flange itself isn't a problem. It's very thick and doesn't get
that hot. After all, Mr. Hannover recommends sealing it with RTV.
On the BD-4, I used a mild steel flange from Racing Beat for my exhaust
system welded to 321 tubing. They sell a steel flange for the Renesis for $47
(http://www.racingbeat.com/resultset.asp?PartNumber=16169)
as well as a 304 stainless steel one for $125
(http://www.racingbeat.com/resultset.asp?PartNumber=16168)
The SS one looks like a better deal as the transition to round tubing
is included.
Bob W.
On Fri, 13 Nov 2009 15:37:45 -0800
"Jeff Luckey" <JLuckey@pacbell.net> wrote:
I thought that the recommended material for rotary engine exhaust parts was
321 stainless. Is 304 OK to use? I thought the temp rating for 321 was
higher (like 1500F)?
Please correct me if I have incorrect info.
_____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of kevin lane
Sent: Friday, November 13, 2009 11:31
To: Rotary motors in aircraft
Subject: [FlyRotary] renesis stock exhaust flange
I didn't come across this fact in the archives and thought I'd pass it on.
the stock exhaust flanges appear to be made from powdered metal. when you
attempt to weld to them the base metal breaks off very easily. I was going
to modify the stock exhaust, then was talked into a new header, using the
original flanges. it's only money. better to break on the workbench, no?
I ordered a new 304 flange from ed klepis today. BTW, Columbia River
Mandrel Bending supplies Burns with parts and costs 1/3 to 1/2 the price,
plus sells schedule 10 tubing & elbows [.090 wall] as well. they have been
good to deal with. http://www.mandrel-bends.com/catalog/contact-us.html
kevin
interesting to watch mandrel bending. they pull this "chain" of brass
doughnuts thru the tube while bending it.
--
N93BD - Rotary Powered BD-4 - http://www.bob-white.com
Now Rotary Powered Alpine http://www.youtube.com/watch?v=FwceNc2ydN8
Cables for your rotary installation - http://roblinstores.com/
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