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I also used a
tool (used to finish lightening holes) to put a 1/4 inch beveled edge around
the firewall. This tool is about $12 from Aircraft Spruce and consists of
two
closely spaced rollers on a handle allowing it to be run along the edge of
the
material so the bevel can be formed. The benefit is to stiffen the firewall
material to prevent near-edge oil-canning and provide a way to hide the
fiber-
If you don't have time to wait for the tool you can make one. Take a scrap
of 1/8" micarta or
similar (hard nylon, old cable pulley) and hacksaw a cut perpendicular to
the edge about 5/16" deep.
Round one corner of the cut to about 3/16" radius. Oil the edge of the
sheet to be beveled and
insert it in the cut and pull the tool around the sheet holding it against
the rounded corner. You
might have to go around a couple of times.
Subject: No hard points??
I couldn't help but notice that the manual recommends that your cut & fit
the fiberfrax to the firewall, attach all the layers with silicone, and
then glue the stainless sheet over the top of them the same way. I'm
curious about how much that fiberfrax compresses when you torque down the
engine mount attachment bolts... seems to me that the insulation would
compress considerably and allow the stainless sheet to dent inward under
all that bolt pressure. , or am I worrying about a non-event
again?
<Marv>
Yes you are!
Beside the engine mount bolts you are going to put lots of bolts through
that firewall.
Bill N7WB
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