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Mark,
That is very cost effective.
George ( down under)
----- Original Message -----
Sent: Saturday, January 17, 2009 11:39
AM
Subject: [FlyRotary] Re: DNA
Muffler
George,
It runs about $135 US, plus shipping from
Canada. So, yes, looks like a good price... if it
works.
Mark
On Fri, Jan 16, 2009 at 7:11 PM, George Lendich <lendich@optusnet.com.au>
wrote:
Mark,
I had a quick look and noticed the parts welded
from the outside - very good I thought. The edges facing down stream will
help. I didn't notice the price, so what price is the Gen 2.
My parts cost me about $250 (Aust) and the
welding, perhaps $150 (Aust)- so if your buying it for about $250 US it's a
good price.
George ( down under)
-----
Original Message -----
Sent:
Saturday, January 17, 2009 10:51 AM
Subject:
[FlyRotary] Re: DNA Muffler
George,
With the edges of each cross bar pointed
downstream of the exhaust flow, I don't see a problem with the heat
attacking them. Also, if one were to somehow break loose, I don't
see how it could manage to block the exit, maybe partially, but not
totally. The engine should still run at reduced power if that were
to happen. I would like to special order one made of 321ss.
Also, if you look at the DNA web site, you'll see that they make a Gen 1
and a Gen II. The Gen II is much stronger as the cross bars protrude
through the can and are welded from the outside. The Gen I bars are
spot welded to the can. The Gen II is also more than twice the price
of the Gen I.
Mark S.
On Fri, Jan 16, 2009 at 4:10 PM, George Lendich
<lendich@optusnet.com.au> wrote:
Mark,
The heat and pulses attack/ affect the
weakest part of any internal part, a thin edge is the weakest part.
You will notice that I don't expose and edges to the sound wave or
hot gases.
George ( down under)
Ed,
That is exactly what I was concerned about too. But if you
look closely, you can see that the bars are made
of 90* angle. That should make them much stronger
than straight bar stock. Not sure what material the cross
bars are made from though. The p/n 1040 is made to
weld to a header/collector and they claim it is good for up to
1000hp.
I have gone ahead and ordered one. I figure it couldn't be
any louder than the Hushpower II whose guts are laying on
the hangar floor in a pile of powder and small pieces. Based
on its short lifespan and the rust-colored debris, I doubt the
Hushpower muffler's innards are made of SS. ;-(
Mark
On Fri, Jan 16, 2009 at 10:08 AM, Ed Anderson
<eanderson@carolina.rr.com> wrote:
Appears
somewhat similar in concept to the SpinTech muffler using
baffles/ladders to break up the sound wave front. The thing I
would wonder about is whether those ladders which appears to stretch
across the diameter of the tube could withstand the pulse pounding
from the rotor. My experience with the turbo 13B (with no
exhaust splitters) would indicate it might not long withstand that
pounding. But, I could be wrong about that.
Guess
you're going to have to buy one and let the rest of us know,
Mark.
Ed
From: Rotary motors in
aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Mark
Steitle
Sent:
Friday, January 16, 2009 9:05 AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] DNA
Muffler
Does anyone on the list have
any real-life rotary experience with the DNA Gen II
muffler (http://www.dnamufflers.com/DNA/main_DNA.html)? It is
an interesting design in that it has no packing material to burn
out. Instead, it utilizes ladder-rungs, which they call
"internal sound diffusers", which resemble a chain of DNA down
through the center of the muffler body, which is made of 304
SS. Their web site claims that the racers use them with great
success. From speaking with a sales rep, they claim there the
rotary crowd uses them too. I'm considering purchasing one of
their FULL THROTTLE COLLECTOR mufflers (P/N 1040), but thought I
would check to see if anyone else has used this style
muffler. This muffler has a 3" inlet/outlet with a 4"
body. So it is compact enough to fit inside my
cowl. My exhaust header has a 3" swivel joint, so it should be
a good fit.
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