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From: RWolf99@aol.com
Message-ID: <bd.a06964.25beb495@aol.com>
Date: Tue, 25 Jan 2000 03:11:01 EST
Subject: LNC2 Subfloor Insulation
To: lancair.list@olsusa.com, jerry@mc.net
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>>

In a message dated 1/24/0 9:04:55 AM, you wrote:

<<a reactive/expansion foam between the subfloor and the contour of the 
underlying honeycomb>>

One of the Lancair builders I visited told me this stuff was extremely 
flammable.  I don't know what specific foam he used, but you might test it 
first.

I spoke to Don Goetz on this topic a few weeks ago, and he told me that the 
peel-and-stick E*A*R foam with the aluminum backing "took the bark out of the 
engine exhaust" and that the remainder of the cavity should be "stuffed with 
fiberglass insulation".

I called E*A*R, who basically verified this approach and referred me to a 
distrbutor (Buckley Industries in Wichita, phone number 316-262-0425).  I 
obtained samples of the foam, which used to be called SD40-ALPSA and is now 
called ADC-006.  Costs about $70 per sheet, which is 27x48 inches, and weighs 
0.44 pounds per square foot.

For the fiberglass batting, they recommended Microlite AA, made by Manville.  
The recommend the 0.6 pounds per cubic foot density.  Their tech data shows a 
sound attenuation for the batting of 9.9 dB per inch at 4000 Hz, 7 dB per 
inch at 2000 Hz, 4.5 dB per inch at 1000 Hz.  (I think my Lightspeed 20K ANR 
headsets attenuate 20 dB at about 500 Hz, so this stuff ain't gonna even be 
close to the headset in performance.)

The batting comes in thicknesses like 1/2 inch and 1 inch.  You use multiple 
layers of the 1 inch to get what you need.  It's cheap, about $8 for a 24x72 
inch piece 1" thick.  

You encapsulate the batting in a reinforced mylar sheet called Insulfab 121P. 
 This stuff looks like mylar over a coarse fiberglass mesh (0.2 inch 
squares).  This stuff was about $20.  You leave about 1 inch hanging over all 
edges, and seal it up with a household iron.  Basically you make a little 
fiberglass pillow.

I ordered the stuff a few days ago, all from Buckley Industries.  I figured 
I'd go "whole hog" under the subfloors since they'll be sealed up forever and 
the total volume (hence weight and cost) is small.  Total cost was $123, 
which is enough for both subfloors with plenty of scrap for practice and a 
few other areas, like maybe ADC006 on the cockpit closeout ribs.  When I get 
the stuff and make a pillow, I'll tell you how it went.  If you want to know 
how well it works, you'll have to wait a while longer...

- Rob Wolf
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Please send your photos and drawings to marvkaye@olsusa.com.
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