Jerry Hey wrote:

I have to laugh at myself because this is the fifth iteration on
the
exhaust system and each time I thought I finally had it right.
Some
of those exhaust systems only lasted a day or two before the
inevitable
realization that they were not so wonderful after all.  So here is
my
latest version in this seemingly endless struggle.  I like it but
I
am
not claiming that it is "IT."

  One goal was to do a better job of routing the exhaust gasses to
insure that they tumbled inside the muffler.   Secondly,  I wanted
to
get the exhaust pipe down to the belly of the airplane.
Thirdly,
 I
wanted to have enough room for the radiator/oil cooler combo.
The
dog
legged, rectangular  exhaust pipe accomplishes all three
objectives.
The pipe is 1.75 x 4 inches (7 sq in.)  Room for the radiator/oil
cooler can be increased as required by lengthening the angled
portion
of the exhaust pipe.  At the closest point, the exhaust pipe
clears
the
engine mt by one inch.      Jerry

You did not give me a chance to do a 3D on your new muffler:)

Come on Jerry get with it. Do a signature file.
I know you are filthy rich and you don't need any more money
but some people would like to try talking you into making some
parts
for them. I am joking. Jerry builds motor mounts for rotary engines
among other things like complete Tailwind fuselages. He does nice
work.

OK folks here is Jerry's email address since he won't tell you
himself :)

Jerry Hey <j-winddesigns@thegrid.net>

Sorry Jerry :)

Paul Lamar

Jerry,
Is the exhaust Inconel and how do you get those donut ends for the
exhaust,
do you press them yourself?
I'm wondering if flat would do for a home made trial ?
Those PP throttle bodies look good, I am waiting for the results.
George (down under)

George, Use 321 through out and make ends flat.   If I build these for
sale, that is what I am going to do.  The donuts are 304. At the time
Ed and I were brain storming this we felt they would work  because
they
are not directly contacted by the exhaust blast and because the cool
tube will bring the temps inside the muffler down to point that 304
could survive.  But we are just guessing about the effectiveness of
the
cool tube. Since the muffler  is mine and I can relatively easily
rebuild it with 321 ends,  I am willing to try out the donut ends but
I
certainly don't recommend them at this time.   With the exhaust temps
coming down due to the cool tube or the Renesis engine,  I don't think
we have to consider Inconel any longer.

Jerry Hey
j-winddesigns@thegrid.net

Don't forget the slip joint on the aft end Jerry. Flat ends are more
likely
to crack.

Paul Lamar

That  helps.  The only difference from plane to plane will be the
removable aft end of the exhaust pipe which can be custom shaped as
required.

Jerry Hey
j-winddesigns@thegrid.net

 
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