From: RWolf99@aol.com
Message-ID: <2d.93356f.25c4887e@aol.com>
Date: Sat, 29 Jan 2000 13:16:30 EST
Subject: Soundproofing
To: lancair.list@olsusa.com
Mime-Version: 1.0

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I have to echo (pardon the pun) the comments about not over-soundproofing.  
The aluminum-backed ADC006 foam is heavy!  The comment about 30 pounds of 
soundproofing is quite believable.

I rode in Orin's turbo-360 at Oshkosh two years ago.  I was much quieter than 
the Cessna 150 I fly.  It may have been the same as my Miata when it goes 70 
mph.  I didn't have a decibel meter, but I did take off the (Bose ANR) 
headset and was amazed at how quiet it was.  I asked him about soundproofing 
and he said he didn't have any.  I looked under the panel and could see the 
bare firewall plywood/fiberglass, so I know there wasn't anything there.  He 
also didn't have any rubber weatherstripping along the canopy frame, either.  
If seems if you build it tight, there's little noise!

(Comments from y'all who are flying, comparing your aircraft to a 150/172, 
and specifying your soundproofing, if any, would be greatly appreciated 
here...)

Having said that, I plan to install the ADC006 and fiberglass batting under 
the subfloors.  I'm strongly considering ADC006 alone on the interior side of 
the cockpit closeout ribs.  But that's all.

I have a pair of Lightspeed 20K headsets.  Best money I ever spent, and a 
whole lot lighter than soundproofing!

- Rob Wolf
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