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Mike, any of it will work in the right combination of alloy and thickness -
even mild steel (although I wouldn't think of using it in an aircraft).
I used 304 SS PIPE (0.11 thick wall) which has close to 500 hours over 10
years. It work just fine - easier to weld bungs and such to it than the
thinner wall tubing.
However, the only down side is weight in my opinion. If cost were no
object Iconel tubing would probably be idea, but 0.065 321 SS would probably
be my next choice. I know a lot have used thinner wall tubing - but if you
have ever seen the red/yellow - almost white hot glow of a rotary exhaust
header with a rotary engine at full boogy, you will know why you don't want
to skimp in that area (my opinion of course).
Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com
http://www.andersonee.com
http://members.cox.net/rogersda/rotary/configs.htm#N494BW
http://www.dmack.net/mazda/index.html
-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Michael Silvius
Sent: Thursday, July 24, 2008 12:13 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: exhaust building
Dale:
I guess my question is; is it acceptable to use the more readily available
304 SS and what thickness (.065 seems to be common) for our application or
should we hold out for 321?
most of the 321 seems to be available in .035 wall. Is that thick enough?
Michael
----- Original Message -----
From: "Dale Rogers" <dale.r@cox.net>
> Michael Silvius wrote:
> > ... what is the difference between that and 321 and which is preferable
for our
> > exhaust building?
>
> 304 has about 6% more Chromium and about 100x the Nickel content of 321.
> 321 contains about .7% Titanium; 304 has none.
>
--
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