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George,
Thanks. Read through it yesterday. Nothing too
earth shattering here. What the article really didnt discuss and what I
think is the major problem we face in aircraft which is less of a problem in a
car is the need to get sufficient muffler volume. Finding space for a muffler
that actually has sufficient volume to do any good on an airplane is
problematic.
Havent yet seen the muffler that relies on
"reflective" (aka passive cancellation) that really works. Tried a variety of
them on various cars over the years, and of course the homebrewed "spiral flow"
muffler on my airplane currently. Still waiting for someone to come up with one
that actually works and will fit on my airplane.
Meanwhile I am intrigued by the absorptive design
which I posted here the other day. Its the only thing I've seen that actually
provides plenty of volume, appears to be capable of both muffling and lasting,
and wont look too terrible. I'm thinking about trying to throw together
something cheap and easy to try out before committing a bunch of time and
effort.
Mike
----- Original Message -----
Sent: Sunday, October 04, 2009 11:38
PM
Subject: [FlyRotary] Re: engine runup
video
Mike,
The address is right, but it didn't work when I
tried it also.
What I did was use up to Miscellaneous on the
address and clicked on exhaust etc on the LHS of the screen - OK.
George ( down under)
----- Original Message -----
Sent: Monday, October 05, 2009 11:45
AM
Subject: [FlyRotary] Re: engine runup
video
That link didnt work for me
George.
Mike
----- Original Message -----
Sent: Sunday, October 04, 2009 3:45
PM
Subject: [FlyRotary] Re: engine runup
video
Mike,
Here's a good site for general info on
mufflers, mine and Bill Jepson design is around deflection.
George ( down under)
----- Original Message -----
Sent: Monday, October 05, 2009 2:34
AM
Subject: [FlyRotary] engine runup
video
For anyone who hasnt had that first engine
run and is looking for some motivation. A buddy visited the hangar a few
weeks ago and shot some video of an engine runup. He posted it to his
website and you can find it here:
This was shot right after I re-installed my
original muffler after the aborted DNA muffler test. Noticeable in the
video is the big staging bog. I had this tuned out about 15 minutes
after he shot the video.
Mike Wills
RV-4
N144MW
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