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  #11  
Old 01-10-2014, 03:24 PM
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Mike S Mike S is offline
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Originally Posted by spaceflightmeow View Post

(Long time reader, first time squawker.)
DK, welcome to the good ship VAF
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VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

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  #12  
Old 01-12-2014, 01:04 PM
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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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  #13  
Old 01-12-2014, 01:29 PM
Kyle Boatright Kyle Boatright is offline
 
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Originally Posted by spaceflightmeow View Post
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.
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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  #14  
Old 01-19-2014, 04:56 PM
hudgin hudgin is offline
 
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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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  #15  
Old 01-19-2014, 07:34 PM
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Originally Posted by hudgin View Post
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.
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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  #16  
Old 01-19-2014, 07:45 PM
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Originally Posted by spaceflightmeow View Post
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.
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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  #17  
Old 01-19-2014, 07:58 PM
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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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Last edited by fl-mike : 01-19-2014 at 08:02 PM.
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  #18  
Old 01-19-2014, 09:30 PM
hudgin hudgin is offline
 
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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.
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  #19  
Old 01-19-2014, 10:07 PM
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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.
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  #20  
Old 01-20-2014, 01:00 AM
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longranger longranger is offline
 
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Quote:
Originally Posted by hudgin View Post
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.
That's MADDENING isn't it! I've found that hitting the Preview Post button occasionally will keep you logged in.
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