--Gary V wrote:

Hi Guys,

My RV6A come alive yesterday when I started the Powersport
rotary
for
the first time.I used Jerry Hey's idea of the tangential exhaust
system and am very pleased with the sound both at idle and right
up
to
about 5000 rpms which was as high as I went. Idle at 850 rpm is
very
smooth. The noise is not excessive and the sound in my mind was
very
acceptable. The question I have is, will 304 stainless stand up
to
the
temperatures??? The flange is .250, the short stub pipes are
.125
and
the can and downpipe is.065 wall. 304 is all I could find
locally
at
the time but I will redo if necessary now that I have heard the
results.
Thanks for your help,
Gary Van Leeuwen
RV6A #24297 rotary powered
Ontario, Canada

Congratulations. Hope to see you at OSH.
With those thickness' I think it will do OK.

BTW folks this is a p-port engine.

Paul Lamar

Matt Prather wrote:

What throttling does the Powersport use?

850 rpm is great!  Especially for a p-port.

Is it worth it to try to put some instrumentation on the stainless
to
get
an idea of how hot it actually is?  Maybe some welder crayon, or
some
of those temperature stickers...

Regards,

Matt-

They use butterflies in the rotor housing.

Paul Lamar

--Jerry Hey wrote:

That is good news in every category.  Glad the p port idles at 850
rpm,
glad the tangential exhaust is quiet and glad it allows sufficiently
free breathing.   I might add I am not surprised.   Jerry

-Jerry Hey wrote:

Gary,  I think 304 will flake if gotten hotter than 1400 degrees
(working on memory so that number needs to be checked).  If it flakes
than eventually it  will fail,  The bonus, if  you decide to go with
321 using 16 gauge throughout. is that you can build an exhaust system
that weighs less than half the one  you have now.

It is mild steel that flakes Jerry. Ed Anderson has been flying for
years with 304.

Paul Lamar

Not true,  304 will flake.   That is why it is not recommended for high
temp applications.  That is why Burns Stainless  sells 321.  I proved
this by heating 304 in my forge to  orange heat.  When it cooled I
could see obvious flaking.   Jerry

Well if it is thick enough it does not get to orange. Ed's hardly
discolors. I am not disagreeing with you. Anything has its limitations.
There is no doubt 321 is better and lighter.

Paul Lamar
 
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