Received-SPF: pass
 receiver=logan.com; client-ip=72.52.218.78; envelope-from=bob@bob-white.com
Date: Fri, 13 Nov 2009 17:28:04 -0700
From: Bob White <bob@bob-white.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: renesis stock exhaust flange
Message-Id: <20091113172804.4be959e6.bob@bob-white.com>
In-Reply-To: <list-3975513@logan.com>
References: <list-3975513@logan.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit

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/