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  #1  
Old 01-08-2014, 06:59 PM
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spaceflightmeow spaceflightmeow is offline
 
Join Date: Oct 2013
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Default 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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  #2  
Old 01-08-2014, 07:26 PM
lorne green lorne green is offline
 
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Location: Oliver, B.C. Canada (Okanagan valley)
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With the engine running?
Oh, and welcome the club.
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Old 01-08-2014, 07:36 PM
Kyle Boatright Kyle Boatright is offline
 
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Location: Atlanta, GA
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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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  #4  
Old 01-09-2014, 02:20 AM
Vansrv7arob Vansrv7arob is offline
 
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Location: Coal Point, Australia
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Default 100db not too bad interesting link on loudness

http://www.gcaudio.com/resources/howtos/loudness.html
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  #5  
Old 01-09-2014, 09:58 AM
johnfurey johnfurey is offline
 
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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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Old 01-09-2014, 12:06 PM
Bevan Bevan is offline
 
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Location: BC
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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
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  #7  
Old 01-09-2014, 12:16 PM
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flytoboat flytoboat is offline
 
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Quote:
Originally Posted by johnfurey View Post
93~95 in cruise measured with iphone on my 7 Tip Up with no sidewall or firewall insulation
What app are you using?
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  #8  
Old 01-09-2014, 12:46 PM
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schristo@mac.com schristo@mac.com is offline
 
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Location: WA
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Default Interesting...

This thread prompted a bit of research into meter apps for me...

I purchased SPLnFFT Noise Meter for 3.99 for the iPhone.
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  #9  
Old 01-09-2014, 05:39 PM
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hydroguy2 hydroguy2 is offline
 
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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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Old 01-10-2014, 03:08 PM
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GKnut GKnut is offline
 
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Location: Virginia Beach, VA
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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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