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/