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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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