Chapter 5 - Fuselage
5.4 - Fire wall
Page 52
The lower engine mounting areas have only one plywood per hole. Cover the area
between these reinforcements with a total of 8 layers in IDB pre-lam (this is one of the
tail end mounting areas). The area of the fire wall next to it (bolt hole side) will receive 8
layers folding the overlap at the screw mounting points. Wet the surface that the IDB pre-
lam will cover with a thin layer of brushed epoxy . This applies to all areas where the pre-
wet BID will be applied, helping to ensure good bonding in these areas. Work bubbles
out of the resin with a brush or squeegee.
5.4.2.2
Lamination of the upper fire wall reinforcements
The upper sides of each of the upper reinforcements are reinforced similarly to the
lower ones, with a total of 8 layers . Lamination of these gussets can be performed in two
stages by decreasing the amount of overlap by about 1 inch at each stage, this will prevent
accumulation of all concentrated loads in a single row. Finally, part of the upper surface
of the upper reinforcements will be laminated on the upper half of the fuselage, which
will happen when it is permanently installed.
Glue the bottom surface of the side braces with 6-layer BID . Between the side and
top reinforcements use a 8 layer BID tape taking care to cover the upper mounting hole
area of the engine mount.
Glue the top long reinforcement with a 6 layer BID tape . use about three inches of
overlap on the firewall plywood, and a piece long enough for a complete overlap over the
reinforcement. do the same thing with a tape 3-layer BID on the lower surface of the
upper long reinforcement, but just use a 2 inch overlay on the fire wall. Trim the glass
fabric