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08-31-2017, 12:27 PM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Quote:
Originally Posted by sglynn
... This is damping. (Note there is no such word as dampening)......
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Webster would disagree...
https://www.merriam-webster.com/dictionary/dampen
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Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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08-31-2017, 12:30 PM
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Join Date: Jul 2013
Location: US
Posts: 2,251
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Quote:
Originally Posted by snopercod
I also installed a spray header in the engine compartment leading back to a receptacle on my panel that my Halon fire extinguisher will fit into.
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Has anybody demonstrated that this would work on an engine fire, what with the volume/velocity of air moving around under the cowling? I'm not saying it wouldn't, I'm very curious...
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08-31-2017, 12:48 PM
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Join Date: Jan 2006
Location: Winston-Salem, N.C.
Posts: 1,213
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I think Dave Anders won a competition for quiet cockpit, and I remember seeing pics of his -4 completely covered in black egg crate foam..Im sure it was quiet, but in my -4, I dont want the sides any closer than the skin for arm room and simplicity. My wife and I both use Halo QT's, and I have never heard anyone tell me I have noise through radio transmission. The Halo's will spoil you and are perfect in the small cockpit for every reason. I don't consider my -4 all that loud actually.
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Bill E.
RV-4/N76WE
8A7 / Advance NC
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08-31-2017, 01:12 PM
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Join Date: Jul 2013
Location: US
Posts: 2,251
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Hey, now there's an idea  Bet I could find enough scrap anechoic foam at work to really deaden the noise LOL! Make the interior look something like this:

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08-31-2017, 02:07 PM
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Join Date: Aug 2016
Location: Asheville, NC
Posts: 2,104
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Quote:
Originally Posted by RV7A Flyer
Has anybody demonstrated that this would work on an engine fire..
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Not that I know of. I ran the spray bar about 4" fwd of the firewall near the top. Underneath it are the oil filter, oil cooler, gascolator, boost pump, fuel lines, and oil lines. I doubt my little 1 lb. Halon bottle would stop a raging fire, but it might help for long enough for me to get on the ground. "It's experimental" 
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(2020 dues paid)
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08-31-2017, 03:13 PM
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Join Date: May 2006
Location: Pocahontas MS
Posts: 3,884
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Quote:
Originally Posted by az_gila
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I think that is a fairly recent change, brought about by the near-universal misuse of the term to the point that it was effectively redefined by our culture.
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08-31-2017, 04:50 PM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Quote:
Originally Posted by rv7charlie
I think that is a fairly recent change, brought about by the near-universal misuse of the term to the point that it was effectively redefined by our culture.
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My thought from going to Scouse skools in the 60's was that the terminology was correct.
It even appears as far back as 1890, written by a colonial...
https://books.google.com/books?id=PO...ing%22&f=false
Added - I'll throw this one in for 1898 Marine Engineering...
https://books.google.com/books?id=r5...ing%20&f=false
It may be that millennials actually resurrected the original use of the word... 
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
Last edited by az_gila : 08-31-2017 at 05:20 PM.
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08-31-2017, 05:10 PM
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Join Date: Aug 2016
Location: Asheville, NC
Posts: 2,104
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Wing Roots
One other source of noise is the wing roots. The prop blast beats on the wing roots and that drumming can get into the cockpit if not insulated.
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09-01-2017, 06:49 AM
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Join Date: Jan 2005
Posts: 29
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Look into tacmat
I used dynamat Tacmat, an aerospace thermo-acoustical liner in my T-51 and it made a big difference in temp and noise at a minimal weight. It's made for aircraft cabins and reasonably priced..
Mike
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09-01-2017, 09:32 AM
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Join Date: May 2005
Location: Tuttle, Oklahoma
Posts: 2,563
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Quote:
Originally Posted by RV8JD
So what if Webster has it? Probably written by some Millennial!
No self-respecting Vibration or Flutter Engineer would use the term "dampening".  It's DAMPING when used in an Engineering context!
As an aside, note that the amplitude of vibration can be reduced by adding damping, without necessarily changing the natural frequency of the vibration mode.
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Oh my, now this is so funny! ROFLAL!! I am speechless! Engineers arguing over semantics of the use of the English language.   
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