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01-10-2014, 03:24 PM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,420
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Quote:
Originally Posted by spaceflightmeow
(Long time reader, first time squawker.)
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DK, welcome to the good ship VAF 
__________________
Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011 
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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01-12-2014, 01:04 PM
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Join Date: Oct 2013
Location: SoCal
Posts: 83
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Based on the responses, ~100dBA seems. I wonder how that compares to a C172 or C152? Would be nice if it was lower than those two.
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Into the blue again, after the money's gone
RV-7A
Empennage complete minus glass work.
Wings kit in progress.
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01-12-2014, 01:29 PM
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Join Date: Aug 2005
Location: Atlanta, GA
Posts: 4,219
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Quote:
Originally Posted by spaceflightmeow
Based on the responses, ~100dBA seems. I wonder how that compares to a C172 or C152? Would be nice if it was lower than those two.
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A good set of ANR headsets will turn that 100 dB into 70 or 75, which is a very comfortable noise level.
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Kyle Boatright
Marietta, GA
2001 RV-6 N46KB
2019(?) RV-10
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01-19-2014, 04:56 PM
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Join Date: Apr 2007
Location: Cedar Hill, Tx.
Posts: 159
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I think you need to be fair and compare apples with apples. Engine size and noise suppression methods also need to be compared. I used to fly an Arrow with the same engine that I have in my RV 7. I could hear my watch ticking in that airplane. In another one I couldn't hear my self think. They were both equipt the same. That was in the days when no one wore head sets. Huh?, what did you say?
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member 1 of 6
Metal Feathers Club
RV 7 N706CB
1st flight Oct 18, 08
S/N 72847 tip 200HP CS glass IFR
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01-19-2014, 07:34 PM
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Join Date: Oct 2013
Location: SoCal
Posts: 83
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Quote:
Originally Posted by hudgin
I used to fly an Arrow with the same engine that I have in my RV 7. I could hear my watch ticking in that airplane.
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I'm curious to know what the Arrow has in terms of mechanical and acoustic isolation that might also be feasible to install in the RV-7.
__________________
Into the blue again, after the money's gone
RV-7A
Empennage complete minus glass work.
Wings kit in progress.
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01-19-2014, 07:45 PM
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fugio ergo sum
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Join Date: Apr 2006
Location: Carlsbad, NM
Posts: 1,912
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Quote:
Originally Posted by spaceflightmeow
I'm curious to know what the Arrow has in terms of mechanical and acoustic isolation that might also be feasible to install in the RV-7.
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Whatever it has is far far heavier, more complicated and more expensive than simple noise attenuating (or canceling) headsets. To me it is like wondering how noisy an automobile engine is without a muffler. It doesn't concern me because that is not how I use the device.
Yep, my RV has essentially no noise insulation and I sure like it that way. If my headset disintegrates in flight someday then it will be uncomfortable for me for a few minutes.
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Larry Pardue
Carlsbad, NM
RV-6 N441LP Flying
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01-19-2014, 07:58 PM
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Join Date: Jul 2005
Posts: 1,347
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RV-6A, meter at about top of stick position. No sound insulation to speak of except foam pad and carpet in the footwells. A weighted measurements by rpm and also the Z weighted levels and overall spectrum.
As you can see, most of the energy is at the prop frequencies. That is why the un-weighted Z measurement is so much higher.
Measured with an NTi XL2 meter: http://www.nti-audio.com/en/products...vel-meter.aspx

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Mike W
Venice, FL
RV-6A. Mattituck TMX O-360, FP, GRT Sport EFIS, L3 Lynx NGT-9000
N164WM
N184WM reserved (RV-8)....finishing kit in progress. Titan IOX-370
Last edited by fl-mike : 01-19-2014 at 08:02 PM.
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01-19-2014, 09:30 PM
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Join Date: Apr 2007
Location: Cedar Hill, Tx.
Posts: 159
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I tried to reply to your question but got timed out. I'll get back later. I had to log back in just to write this so I going to bed.
__________________
member 1 of 6
Metal Feathers Club
RV 7 N706CB
1st flight Oct 18, 08
S/N 72847 tip 200HP CS glass IFR
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01-19-2014, 10:07 PM
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Join Date: Oct 2013
Location: SoCal
Posts: 83
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Holy cow, FL-mike, you win the thread. Excellent data. What is the significance of most of the energy being at the prop frequency? My guess is that it prop noise would be acoustic noise, penetrating through the drum-head firewall and also beating down on the canopy.
__________________
Into the blue again, after the money's gone
RV-7A
Empennage complete minus glass work.
Wings kit in progress.
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01-20-2014, 01:00 AM
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Join Date: Mar 2007
Location: 45G, Brighton, MI
Posts: 1,867
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Quote:
Originally Posted by hudgin
I tried to reply to your question but got timed out. I'll get back later. I had to log back in just to write this so I going to bed.
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That's MADDENING isn't it! I've found that hitting the Preview Post button occasionally will keep you logged in.
__________________
Miles (VAF# 1238, Paid up as of 2018)
RV-7 TU 904KM (reserved)
Wings Fitted and Finish Kit on site
Construction Log
Picasa: Empennage Album, Wings Album, Fuselage Album
1955 Cessna 170B flying since 1982
'To get something you never had, you have to do something you never did.' -Unk.
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