Sender: <marv@lancaironline.net> (Marvin Kaye)
To: lml
Date: Sat, 26 Apr 2003 14:43:32 -0400
Message-ID: <redirect-2148338@logan.com>
From: Newlan2dl@aol.com
Subject: Re: [LML] Fw: Acoustic spray
MIME-Version: 1.0
Content-Type: text/plain; charset="US-ASCII"
Content-Transfer-Encoding: 7bit

Hi Craig

I know of a generic type of spary used as a damper.  It's used on cars for 
the underbody to damp the metal vibration.  You can contact EAR products but 
I'll check my data to see if I can come up with a supplier.  The problem is 
it's pretty heavy also.  I also don't know it that stuff is what you heard 
about or not and whetehr it will meet FAR 25.853 for burn.

I don't know how much of a rush you are in but I am currently working with 
Dave Morss to develop data on various weights, efficiencies and costs of 
different materials.  I believe I have a very good light weight solution for 
acoustics utilizing  isolation, barrier (light but thick) and absorber but I 
won't know how effective that is compared to the heavier weight massive 
barriers until I do the testing with Dave.

For the testing with Dave, we will be insulating each part of the plane with 
individual blankets and then go off and do flight testing, rip  it out then 
try the next one.  What I hope to achieve is a determination of how effective 
each different material is from absorbers only (fiberglass batting which is 
what I normally use when I desuign stuff for the airlines) to massive 
barriers with absorbers (what we use for business jets and Head of State 
aircraft).

The bottom line is I am very much hoping to improve the current types of 
acoustic insulation package in terms of both weight improvement and 
acoustics. As a benefit, the thermal will also be enhanced.  It probably will 
be more expensive unless the absorber type works well in which case both 
weight and cost will go down but I doubt that will work all that well.  
Still, that too will be compared.

I'll post the findings later but it will be probably 2-3 months I'm guessing 
to aquire and massage the data.  

Dan Newland

Super ES