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George,
Its my understanding that they work great, except that they're heavy and about as aerodynamic as a brick.
Mark
On Jan 14, 2008 4:30 PM, Joe Berki <
jskmberki@alltel.net> wrote:
How do the spin tech mufflers hold up?
----- Original Message -----
Sent: Monday, January 14, 2008 5:11
PM
Subject: [FlyRotary] Re: What's
this
George,
You could be right about the strapping, but you can see the
white stuff oozing up through almost every hole in the perforated outer
shell. I figure that another 1/2 hour flight ought to just about finish
it off.
Also, from my previous history with the "auger" muffler, I should have
realized that 304ss wasn't up to the task. There are signs of that
already by the grey dust/powder inside the
muffler. Maybe Flowmaster will agree to make one out
of 321ss.
Mark
On 1/14/08, George
Lendich <lendich@optusnet.com.au>
wrote:
Mark,
I have been thinking about this and have come
to the conclusion that it isn't the packing material melting as I believe
that would more than likely turn to dust rather than melt.
It will more likely be some glue
or strapping that holds the packing material in place, before they put on
the outer shield.
George ( down
under)
Dennis,
The outside of the muffler did change color a little. Out of
the box it looked almost like polished stainless steel. Now it still
looks shiny, but it has a definite honey color to it. Yes, I plan to
fly it again. If the packing material melts, or gets pulverized, so
be it. As long as it hasn't lost its structural integrity I
will fly it. Of course, if it gets too loud for the ANR to handle
the noise, or if people start to complain, then I'll change it out.
I'm growing weary of working on the exhaust system. It is still
quieter than the "auger" muffler.
Your system may be easier on the HP-2 due to 1) side port
exhaust, 2) stock exhaust manifold, 3) tangential
muffler and 4) more distance from the exhaust port to the
muffler. I may have to rethink my design to increase
the distance between the exhaust port and muffler. The
instructions did warn that the muffler would get very hot due to some
engineering double-speak. Little did I know that it would spill its
guts on the hangar floor.
Yes, come on down. Best BBQ for miles around.
Mark
On 1/13/08, Dennis
Haverlah <clouduster@austin.rr.com > wrote:
My muffler never gets "HOT" enough
to eject -drip- anything on the floor!!. I have seen EGT
numbers in the low 1800s while at full throttle and running slightly
rich without any noticeable change in muffler performance. So far
no one has said my muffler is louder than my first flight.
I never expected the HP - 2 to work or anything but the Renesis
- but I did not expect to see "stuff" melting and dripping out
either. Mark - are you going to fly it again as is or what
is your plan - I may want to fly over to Lockhart and watch! I am
ready for more Barbecue also! Dennis H. Bill Bradburry
wrote:
Mark,
Did the stuff get on the bottom of your
plane? Has this affected the sound of your exhaust? Did
Dennis' muffler do this?
I
noticed his muffler had a white coating on the outside like it had
been hot. Has yours turned color?
I
wonder how hot the muffler gets at high power settings? Didn't
you say something about a hand held temp gage?
Bill B
From:
Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Mark
Steitle
Sent: Sunday,
January 13, 2008 9:40 PM
To: Rotary motors in
aircraft
Subject: [FlyRotary] Re: What's
this
OK, I can see this is going
nowhere. So I guess I'll have to tell you. This is
what came out of my new HP-2 muffler after a short 20 minute
flight. What you saw in the previous picture was the packing
material MELTING and dripping out the end of the muffler. In the
second picture, you can see it oozing out of the little holes in the
intermediate housing. I was expecting it to "blow out"
eventually, but I wasn't expecting it to melt and run out the
tailpipe. This just blows my mind. Where to go from
here??? Maybe I should replace the packing with titanium
shavings, or lithium crystals.
Mark
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