The guys with straight pipes (even with a lot of 90 degree turns)
think they work GREAT! Their hearing went bad shortly
after they started flying them : )
Tracy (waiting on some 2 1/4" pipe to hook up the Hushpower
II muffler) Weight (9 lbs) is about 4 pounds less than my Spintech
----- Original Message -----
From:
Russell Duffy
Sent: Sunday, February 15, 2004 12:57
PM
To: Rotary motors in aircraft
Subject: [FlyRotary] muffler?
Greetings,
I'm working on mounting
this 14 pound Spin Tech muffler, and just have to ask a
question...
I know that rotaries
are painfully loud with no exhaust on them. I also know that the cast
manifold alone will help significantly, and that a turbo will reduce the
noise to about normal Lycoming levels. As I understand it, this
is partly due to the fact that there are twists and turns that the exhaust
has to negotiate, which reduces the speed, and eliminates the supersonic
pulses.
As it turns out, my
primary pipes will have to make three 90 degree turns before they get to the
collector. I've started wondering if these three turns are enough to
reduce the noise to an acceptable level. My gut feeling is that
it won't be enough, but I think some people are already
running with little to no muffling. I sure would like to
eliminate that muffler, but I'm not optimistic that it will be
possible. What do you think? Silly idea?
Cheers,
Rusty