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5.
The front end.
The cowling has 3 fixing points. Each
fixing point consists of an aluminum
tab, bolted to the fuselage's firewall
with 2 M4 bolts, and a plywood tab,
glued into the cowling, holding an M4
T-nut, bolted against that aluminum
tab. The idea behind this approach is
to be able to access the mounting
bolts from the rear of the cowl
through the cooling air vents. If a
radial engine is installed, access to the
firewall from the front is very limited
due to the cylinders and the ring
muffler. Thus fixing the cowl from the
rear is very convenient. If you intend
to install a twin cylinder gas engine,
you can feel free to alter the cowl
fixture and simplify the process,
however, we recommend to use our
suggestion.
First glue on the firewall. One 3mm
plywood is glued from the inside to
the firewall (use microballon filled
epoxy to fill any gap due to the seam
band inside) and one 3mm plywood is
glued from the outside. This outside
plywood former is reinforced with a
second one, smaller in diameter,
which you need to glue on as well.
After the glue has set, tack the 3
aluminum tabs to the firewall with a
drop of thin CA glue. Use a balsa
stick along the fuselage's outer
contour to determine the position of
the cowl, matching the position of the
milled plywood mount to be glued
inside the cowling.
Now tape the cowl to the fuselage. At
the top the rear surface butts against
the fuselage. At the bottom you need
to use some scrap balsa to create a jig,
which you can tack in place with a
few drops of CA. Make sure that the
top contour of the cowling is perfectly
in line with the fuselage's contour,
Page 34
Instruction Manual F4U-1D Corsair
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