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CARF-Models Ltd.
and the rear edge is parallel to the
firewall. After the alignment is set and
confirmed, tack the milled plywood
mounts inside the cowl, so that the
holes for the bolt match. Then you can
take the cowl off, fill the glue joints of
the plywood tabs inside the cowling
with epoxy and milled fibre, and we
recommend to add a little bit of
fiberglass cloth from the front to
reinforce the joint. Drill a 4mm hole
through the 2 inner holes of each
aluminum tab and through the firewall,
then break the aluminum tabs off.
Enlarge the holes in the firewall to
5.5mm diameter, insert M4 T-nuts from
the inside into the firewall and mount
the aluminum tabs permanently with 2
M4 bolts. Now glue a T-Nut to each
aluminum tab from the front, lining up
with the outer hole. Sand the glue
surfaces well, degrease with alcohol and
glue with a good epoxy, preferably
Hysol or UHU Endfest 300. Wax an M4
bolt and turn it into the nut to keep the
thread free of glue. Alternatively: Glue a
scrap piece of plywood from the front
against the plywood tabs in the cowl,
enlarge the holes to 5.5mm diameter
and install a T-nut the right way around.
Now it's time to mount the engine, in
our Instruction Manual we describe the
installation of the Moki 250 5 cylinder
radial. Please be aware that the engine
diameter is not much smaller than the
cowl diameter. So, centering the engine
is crucial. First determine the center
point of the round firewall. The inner
hole is a perfect circle, central to the
outer contour. Thus it should be easy to
create the center point. A right thrust of
2.5 degree is recommended, so the
center of the engine thrust line must be
moved to the left (viewed from the front
against the firewall) by 12 mm. 0.5 deg.
upthust will be perfect. this and the
sligthly nose down cowl, makes it 6 mm
to the bottom.
Instruction Manual F4U-1D Corsair
info@carf-models.com
12 mm
left
6 mm
down
Page 35
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