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Now determine the position of the control
horns for aileron and flaps. As all controls
are completely internal, it is very important
to get the position of the horns right.
Especially the aileron horn is only 25 mm
long, so a play free linkage, a perfect horn
and servo installation is mandatory.
Aileron: Mill an opening into the aileron at
the root and slot the spar inside the aileron,
to accept the horn. You can cut away the
front root of the aileron as well, which give
you a bit more room to work. Glue the
control horn in, as close to the top surface
as possible. Use a straight edge to extend
the top airfoil contour to the front, to get
the horn to the perfect position. Glue in the
opposite aileron horn at the same time, and
make sure that the position is identical.
This will make sure that deflections of both
ailerons will be identical as well. Use 30
min epoxy, and make sure that the glue
joint is solid and strong!!! Due to the short
arm (less than 25mm, 1" to the axis of
rotation) there will be a very high force on
the horn and the glue joint during flight. If
this joint breaks, the chances of aileron
flutter are high, which can lead to loss of
control and disintegration in flight.
Lastly, drill/mill a hole into the aileron spar
of the wing, so that the control linkage can
be installed later.
Outer Flap: The control horn, just like on
the ailerons, is installed in the very inner
edge of the flap. Therefore mill the flat
spot open and slot the balsa spar behind it.
Measure from the axis of rotation (hinge
pin hole) and write down the distance. It
should be around 40mm. You must make
sure that all 4 flap horns are installed with
that very same distance from the axis of
rotation, to allow a syncronized movement
without having to use 4 separate channels
or matchboxes for the flaps. Locate the
position of the pushrod. If necessary grind
away any excess glue you used to mount
and secure the flap offset hinge.
Instruction Manual F4U-1D Corsair
info@carf-models.com
Aileron horn: Sand
surface and glue
extremely well! Your
plane lives off this
joint!
Page 24
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