Posted for "Bill Harrelson" <
n5zq@verizon.net>:
Rob,
I
did not ground (earth) any of my fuel tanks. I am not aware of any 320/360
builder who has done so. Having said that, it is certainly not a bad idea
as
long as you do it in a lightweight manner.
As far as the
fibrefrax, it’s good stuff. I put it in beneath the stainless
steel
firewall per the manual. What I found is that under compressive loads it
gets squeezed flat causing the stainless to wrinkle. This will have little
or
no practical implication...but it looks like crap. I removed everything
from
the firewall and replaced the fibrefrax with washers everywhere that
something
was bolted to the firewall. This included the engine mount
bolts. Now, I have
solid, no compression, surfaces at the bolts and no
wrinkles in the stainless
while retaining the heat/fire resistance of the
fibrefrax.
The first photo shows the fibrefrax cut out around
the washers (phenolic
behind the battery) and ready for the stainless to
be added.
The second photo is the completed firewall with everything
torqued down and
no wrinkles. I burnished the stainless with scotchbrite
and a hand drill.
Let me know if you need more
info.
Bill Harrelson
N5ZQ 320 2,050
hrs
N6ZQ IV under construction
http://www.mykitlog.com/harrelson/