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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] Exhaust Manifold material
Date: Sun, 6 Dec 2009 08:39:01 -0500
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Hi Phil,

The thickness of my header tubing/pipe was 0.102 (schedule 10 pipe I think)
and has lasted over 500 hours and 10+ years.  Half of that time I use a
turbo block which produces a more powerful exhaust pulse (no splitters in
the exhaust port).  

Now, I would not try to persuade you away from 321 - clearly you can get
longer life and less weight (but as you know - more $$) with it over the
304.
 
No experience with a tangential muffler so can offer no advice on it.

Ed

Ed Anderson

Rv-6A N494BW Rotary Powered

Matthews, NC

eanderson@carolina.rr.com

http://www.andersonee.com

http://www.dmack.net/mazda/index.html

http://www.flyrotary.com/

http://members.cox.net/rogersda/rotary/configs.htm#N494BW

http://www.rotaryaviation.com/Rotorhead%20Truth.htm


-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Phil White
Sent: Sunday, December 06, 2009 6:53 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Exhaust Manifold material

Ed Anderson:    I recall (if memory can be trusted?) that you are using 
304 stainless for your exhaust manifold.  I am wanting to make a 
tangential muffler for my 20B, and wonder if the following might last a 
reasonable time:  
1.   From the ports;  2" x .150 wall
2.   Tangential tube;  4" x .120 wall
3.   Exhaust pipe;  2.5" x .120 wall
4.   End caps on tangential pipe;  .125 plate
5.   Center tube (to help swirl, and to reinforce end caps);  3/4" x 
.080 wall  (wondered if it would be a good or bad idea to run cool air 
through this to cool it and the exhaust a bit, or better to leave the 
ends closed??)

    Are these walls heavy enough to last?  Or is using $175 worth of 304 
a waste of time and money compared to getting the more expensive 321 
stainless?  Your opinion is most welcome.

Phil in IL

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