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Hi John,
I originally, had an 18" length of tubing that I had
drilled 1/8" holes in (a really tedious task) along its length and around its
circumference. I initially thought it really didn't help, until on start
up and taxi while at Tracy's one visit - one of them fell off my header.
Tracy immediately detected the difference in volume and saw what had happened.
waved me down and I put it back on more securely.
So the answer is it will undoubtedly help some - but, it
will still be loud. The best you can hope from is to drop it from ear
shattering to just very loud. Without some sort of damping on a turbo
block the exhaust pegs a 125 dB digital sound meter.
If you have an N/A block then that helps about 8 db worth
right there. If you have a turbocharger then you would be in great
shape.
You may get a bit more muffling than I did as you appear
to have both exhaust ports going to one tube instead of two like I do.
Surprisingly it turns out (according to what I have read on exhausts) its easier
to dampen the sound with the two pipes into one than each by
itself.
I am really interested as I have tried about 5 different
approaches. Those that dampen the sound don't live long and vice
versa.
Ed
----- Original Message -----
Sent: Tuesday, February 20, 2007 7:45
PM
Subject: [FlyRotary] Another exploding
cigar??
Ed, here are the pictures of the exploding cigar
I'm working on (experimental,right), the pipe is 2 1/2", the same as my
exhaust. The perforated screen has 5/32" holes and is installed in
a 5" long cut which is about 27 degrees from the horizontal of the
pipe. If the noise level is lowered by this installation I will find
some SS of about .060" and weld up one of all SS. This is all regular
exhaust pipe for trial and not intended for flight, although it is 30 inches
from the rotors and could be ok? Startup is still about 3 weeks away, as
the intake manifold is still at the welders. I welcome any and all
comments and criticism, as I stated, I don't have a clue how this will
work. JohnD
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