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01-08-2014, 06:59 PM
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Join Date: Oct 2013
Location: SoCal
Posts: 83
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RV-7 cabin noise measurements?
Has anyone measured the noise level in the RV-7 cockpit in terms of dBA?
(Long time reader, first time squawker.)
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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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01-08-2014, 07:26 PM
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Join Date: Dec 2005
Location: Oliver, B.C. Canada (Okanagan valley)
Posts: 786
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With the engine running? 
Oh, and welcome the club.
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Lorne
RV 7a tip-up
Pre-cover MD-RA Inspected.
Canopy completed. Bonded with Sika-Flex.
Up on her mains, Firewall Fwd and wiring on going.
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01-08-2014, 07:36 PM
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Join Date: Aug 2005
Location: Atlanta, GA
Posts: 4,218
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I've used the dB meter on my iPhone to measure it. Around 100 is typical for cruise. Full power is more.
I have an RV6 with carpeted floorboards but few other "soft surfaces" inside.
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Kyle Boatright
Marietta, GA
2001 RV-6 N46KB
2019(?) RV-10
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01-09-2014, 02:20 AM
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Join Date: Dec 2010
Location: Coal Point, Australia
Posts: 128
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100db not too bad interesting link on loudness
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Regards,
Rob.
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M: (61) 401 578 700
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01-09-2014, 09:58 AM
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Join Date: May 2005
Posts: 233
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93~95 in cruise measured with iphone on my 7 Tip Up with no sidewall or firewall insulation
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John Furey, RV7. Ohio
Life's Short...Fly Often!
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01-09-2014, 12:06 PM
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Join Date: Sep 2007
Location: BC
Posts: 1,674
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Where are you guys holding the Iphone to measure the sound level? By your ears? I would think the sound levels would vary dramatically where and at what orientation the microphone is facing.
Bevan
__________________
RV7A Flying since 2015
O-360-A1F6 (parallel valve) 180HP
Dual P-mags
Precision F.I. with AP purge valve
Vinyl Wrapped Exterior
Grand Rapids EFIS
Located in western Canada
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01-09-2014, 12:16 PM
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Join Date: Dec 2006
Location: Collinsville, IL
Posts: 620
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Quote:
Originally Posted by johnfurey
93~95 in cruise measured with iphone on my 7 Tip Up with no sidewall or firewall insulation
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What app are you using?
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Don
VAF #1100, EAA864
-6A bought flying
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01-09-2014, 12:46 PM
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Join Date: Sep 2007
Location: WA
Posts: 988
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Interesting...
This thread prompted a bit of research into meter apps for me...
I purchased SPLnFFT Noise Meter for 3.99 for the iPhone.
__________________
Stephen
RV7 powered by a lycoming thunderbolt IO-390
turning a whirlwind HRT prop
with more hours flying than building... 2,430 on the hobbs!
ORCA Flight
Race 771
margarita!
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01-09-2014, 05:39 PM
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Join Date: Sep 2006
Location: Townsend, Montana
Posts: 3,179
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Wonder how these Apps work. I have...well work has a nice high quality Sound pressure level meter. I can take A-weight and C-weighted reading. C is almost always a higher reading, but the A curve is supposed to be what the ear actually is damaged by. I take monthly reading in the power house, this readings coupled with Vibration analysis helps us monitor the gearbox health.
I don't recall the exact numbers, But seem to recall anything over 85dBa has a limited exposure time. Control room is 64-72, other space between 80-105 the peak area is the turbine pit at 104(lowpower)-122dBa(full power).
I'll try to bring it with me one of these days.
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Retired Dam guy. Life is good.
Brian, N155BKsold but bought back.
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01-10-2014, 03:08 PM
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Join Date: May 2012
Location: Virginia Beach, VA
Posts: 28
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I'm wondering how much is actually coming from the engine, verses the exhaust, vibration, wind, etc.? From this, how much would a muffler lessen it?
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Glen Knutson
Virginia Beach, VA
RV-7 Empennage, wings and fuselage complete, engine and avionics to go.
RV-7 Tip-up w/IO-360
The best time to rest is at your funeral!
VAF donor: 2012, 2013, 2014, 2015, 2016, 2017
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