Yes more or less like
the coax muffler. Instead of drilling a few holes here and
there, I bought a perforated sheet and welded it into a tube. I
wanted to have it open on both ends, to create a vacuum and help
suck the air out of the cowl. But right now to make flights
enjoyable, I might close up the ends and see how that works.
Is anyone running a coax muffler ? Because it's extremely loud
in my case.
I did buy the??Aero Exhaust AT2525XL and it worked great while doing
all my ground testing, but the 6" outer shell was just to
big to fit under the plane. Sadly I brought it back home to
Canada and haven't flown with it yet here in FL. I'll pack
it in my suitcase next trip down.
The racing
beat presilencer is
suppose to be good. I believe it has stainless steel wool
inside and maybe ceramic mat over that. For fun I stuffed
ceramic mat into the 4" pipe and it did quite things down.
Except with the 4" tube being open at both ends, it sucked
it out. Right now I'm trying to source some high temp ss
fiber mat to first wrap the pipe, then wrap the ceramic over
that, then close up both ends.
1.5minutes into the take off the EGT probe right before the
4" pipe is 1700F. ?? (EGT1 = 1768F, EGT2= 1819F)
- Matt Boiteau
On 2019-11-11
5:19:37 AM, Le Roux Breytenbach breytenbachleroux@gmail.com
<flyrotary@lancaironline.net> wrote:
Matt: So
the setup for your exhaust, is more or less the one that
Paul
Lamar suggest in his forum, 2 years or so ago.?
The coax muffler ?
Le Roux Breytenbach
On Mon, Nov 11, 2019 at 5:38 AM Matt Boiteau
mattboiteau@gmail.com
wrote:
>
> What are you guys running for exhaust? The thing is
stupid loud and can barely talk on radio. Headset is
LightSpeed wireless Tango's. Their ANR does not work well
with the pitch of the rotary. Will try a Bose headset
tomorrow.
>
> I have 2.5" exhaust leaving the cowl. (ex1.jpg) It
comes down and centers the bottom of the plane into a 4"
outer pipe. (ex2.jpg) The 4" outer pipe (5ft long) is open
to the free air and exits behind the rear bulkhead. The
2.5" converts to a 3ft long perforated pipe (ex3.jpg) and
exits inside the 4" outer pipe. For fun, I filled it full
of ceramic fiber insulation mat, which did help a little
until it blew all out.
>
>
> - Matt Boiteau
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