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1. 05:48 AM - Re: Noise Reduction (Gary Aman)
2. 06:17 AM - Re: Noise Reduction (John Hauck)
Message 1
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| Subject: | Re: Noise Reduction |
Rick,what rpm does your prop turn when the vw is at 3600.You still
running the Valley redrive unit?
> On Jun 29, 2016, at 11:04 PM, Rick Neilsen <neilsenrm@gmail.com>
wrote:
>
> We had a discussion a while ago about ways to reduce noise in our
Kolbs. I just flew tonight and tried to evaluate how quiet it is now
with my current headsets. I fly with Bose QC-20 noise canceling ear buds
under my Sigtronics over the ear headset with the Headset noise
canceling kit. I plug my Bose ear buds into my intercom to hear and my
Sigronics microphone into my intercom to speak. At cruise it is like
sitting in my living room with a truck idling out side the house. I can
hear the low tones of the engine in the back ground but I can hear
voices on the radio at normal indoor volumes. When I talk, the intercom
opens the microphone so I can hear more noise till the squelch cuts it
off.
>
> When I started the engine tonight I had the Bose ear buds in my ears
but turned off so I could hear the engine sounds clearly. Then I turned
on the Bose noise canceling and that cut the idle engine noise to a
reasonable level. Then I put the Sigtronics headset on with the
Sigtronics noise canceling off. This cut out most of the high frequency
noise. Then I turned on the Sigtronics noise canceling kit. Not much
change. In the air with my big VW turns 3200 RPM at app 60% cruise
power. If I turn the Sigtronics noise canceling kit off I can hear the
engine sounds better so I turn if off from time to time to check the
health of the engine. My engine turns only 3600 at full power (it is
loud!) so most of the noise is lower frequency which noise canceling
does a pretty good job of canceling.
>
> Rotax engines turn more RPMs creating a higher frequency noise which
noise canceling doesn't work as well to cancel. My understanding is that
higher frequencies are easier to reduce with passive aviation head sets
but I don't know for sure. I other words I don't know how well my setup
will work for you.
>
> Anyway it sure is nice not having my old ears ringing after every
flight.
>
> Rick Neilsen
> Redrive VW Powered MKIIIC
Message 2
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You are right, Rick N. ANR is designed for lower frequency noise, like
much slower turning engines than the Rotax two and four cycle engines.
The 912ULS easily overpowers my ANR headset. Already deaf, I am right
on the edge of not being able to understand communications with others.
With a passive headset, I am lost.
Larry C's set up works well. If I was going to be doing a lot of long
cross country flights in the future I'd probably go with Larry's set up
or spend the money and go with Rick N's set up.
There was a time I could hear well with a passive David Clark. I lost
my hearing in VN 50 years ago. Got a chance to go to Army helicopter
school two years later. Had to cheat a bit to pass the flight physical.
Never had a problem being able to hear and understand communications
with a flight helmet, even though I could not pass the hearing test.
Right now my ears are ringing louder than my Rotax. ;-)
Don't think my hearing loss will ever ground me. There is no
requirement to have a radio in my MKIII. I am legal, with a radio, to
fly into non-towered airfields in the US. Don't plan to fly back to
Canada, so I good there.
john h
mkIII
Titus, Alabama
From: owner-kolb-list-server@matronics.com
[mailto:owner-kolb-list-server@matronics.com] On Behalf Of Rick Neilsen
Sent: Wednesday, June 29, 2016 10:05 PM
Subject: Kolb-List: Noise Reduction
Rotax engines turn more RPMs creating a higher frequency noise which
noise canceling doesn't work as well to cancel. My understanding is that
higher frequencies are easier to reduce with passive aviation head sets
but I don't know for sure. I other words I don't know how well my setup
will work for you.
Anyway it sure is nice not having my old ears ringing after every
flight.
Rick Neilsen
Redrive VW Powered MKIIIC
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