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Hi Bill,
I've tried about 4 experiment with mufflers - all basically
trying to soften the shock wave. I had a couple that really quieted the
engine - but at cost of back pressure and lost power. A couple that did a
modest job of taking the metallic content down - but those soon disintegrated
(the internals). But, then again, most of the baffles were
perpendicular to the shock wave and just couldn't take the pounding. A
cone or similar oblique surface would likely survive longer. I agree the
perforated tube is likely to not be able to take the pounding especially with
the cones attached.
I said I was through trying muffler experiments, but have to
admit I am tempted to try one more time with cones {:>)
Ed
----- Original Message -----
Sent: Wednesday, May 03, 2006 1:37
AM
Subject: [FlyRotary] Re: Muffler
cones
George, here was my idea of a muffler using cones. The
center (smaller)
tube is perforated with the cone attached to it.
Room at the widest part of
the cone and wall of outer tube for gas to
pass. A variation was to have
the cone extend to the outer tube
wall and have all cones facing the header
end of the muffler only
permitting gas (and sound) through the perforated
center
tube.
Ed
Ed, If I might jump in here.
This looks like it should work. The muffling won't be tremendous
but it should really take the edge off. Bending the shock wave really takes
something stout with the rotary, doesn't it? I think the spiro-flow might work
and survive better though. (The one that looks like an auger trapped in a
can.) I always worry about perf tube with the rotary, when it gets super
hot it seems like the pulses try to tear it off like a perf paper! You really
know what you're up against after the washers though so best of luck.
Bil Jepson
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