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