If you have a true vacuum bottle as a flask you should not need more
insulation but if you are using a winter capacity you can use anything to
put airspace between the vario and the glare shield the white beaded foam is
probably best but a pain and messy to work with there are some flexible foam
rubbers you could use. There are other reasons to insulate your capacity and
use the copper wool inside, maybe we can hear from Mike Borgelt he can
describe the reasons more better er er than I.

Pete




"Chris Nicholas" wrote in message
...
All the installations I have seen use a standard vacuum flask with no
additional insulation, but they were all buried either beneath/behind
the instrument panel, or inside the fuselage - anyway in shadow.

A key element I have read about, and all mine have been fitted with, is
copper pan scourers loosely filling the interior of the flask, so that
temperature variation within the capacity is elinimated.

However, I am no expert, and I look forward to some who are telling how
it really should be done.

Chris N.