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Mufflers (gasp!) was Lyco rumble & Subie

 
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Flyguy6a(at)aol.com
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PostPosted: Sun Jan 01, 2006 10:31 am    Post subject: Mufflers (gasp!) was Lyco rumble & Subie Reply with quote



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terry(at)tcwatson.com
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PostPosted: Sun Jan 01, 2006 11:43 am    Post subject: Mufflers (gasp!) was Lyco rumble & Subie Reply with quote


For what it's worth, I have to be with Mickey on this one. One of the
reasons for being a good neighbor is to keep your neighbors from passing
laws to force you to do what being a good neighbor would have meant in the
first place. We all should know by now that the best way to screw up a good
idea is to pass a law that makes it mandatory. If we don't show enough
respect for non-flyer's sensitivities to the noise we make, we are insuring
the day will come when FAA inspectors will be sitting by the runway with
noise-measuring equipment writing violations for those that miss some
arbitrary standard. The longer we can put off that day the better.
Maybe some of you really smart guys can come up with a way to tone down a
Lycomming on an RV with the least loss of power and increase in weight.
Didn't I read here on the list some time back that the gentleman that builds
most of the exhaust pipes for us is working on it?
Terry
RV-8A #80729
Finishing?


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flyrv6(at)bryantechnology
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PostPosted: Mon Jan 02, 2006 3:08 pm    Post subject: Mufflers (gasp!) was Lyco rumble & Subie Reply with quote


since the prop makes most of the noise, how is the muffler going to make a
significant difference? When the prop is slow on landing the engine is
pretty quiet.


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terry(at)tcwatson.com
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PostPosted: Mon Jan 02, 2006 3:42 pm    Post subject: Mufflers (gasp!) was Lyco rumble & Subie Reply with quote


Some airfields and seaplane bases recommend or require slowing the prop down
to 2500 rpm as soon as you are safely clear of obstructions. I think this is
primarily to reduce prop noise, but it of course affects the engine noise
too.
I think the real point is that you reduce noise where you can. I also
understand that 3-bladed props are quieter than two bladed props. Let's hope
they don't become required for noise reduction.
Terry
since the prop makes most of the noise, how is the muffler going to make a
significant difference? When the prop is slow on landing the engine is
pretty quiet.


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aldaniels(at)fmtc.com
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PostPosted: Mon Jan 02, 2006 4:05 pm    Post subject: Mufflers (gasp!) was Lyco rumble & Subie Reply with quote


Its takeoff where most of the problem is, and with straight pipes it is
flyover noise. Prop noise has to due with prop tip speed. A cessna 185
or 206 with a long prop really turns gas into noise, but most RV's and
other experimental it is mostly good old exhaust noise. Even my Honda
Civic powered Kitfox is loud without its SuperTrapp, with it you hardly
hear it takeoff. Denial is not just a river in Egypt.
Tim Bryan wrote:
since the prop makes most of the noise, how is the muffler going to make a
significant difference? When the prop is slow on landing the engine is


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lhelming(at)sigecom.net
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PostPosted: Tue Jan 03, 2006 4:54 am    Post subject: Mufflers (gasp!) was Lyco rumble & Subie Reply with quote


Is it just me or do CS props make a lot more noise on take off?
Indiana Larry, RV7 Tip Up FP Sensenich
"Please use the information and opinions I express with responsibility, and
at your own risk."
Achieving a certain level of success in life is only important if you can
enjoy the level you've reached after you've got it.
----anonymous---


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