Composite-ARF SPARK Instruction Manual page 17

Composite-ARF SPARK
don't hit the spar at 45° throw.
If you chose to fit servos without integral wing-
mount brackets, you can just add a couple of
extra milled liteply pieces to increase the mount
height to flush with the top of the servo, and then
secure using the small screws thru' a small strip
of the 1.5mm plywood (see photos right).
Fit a heavy duty servo arm to each servo, and
centre them now with your R/C so that they will
be close to 90 degrees to the bottom surface of
the wing.
Prepare the surfaces for gluing by sanding and
cleaning, and glue the complete servo and
mount assemblies into the wing with a little slow
epoxy and micro-balloons mixture, firmly against
the main spar and also against the plywood rib
that is on the outside of the landing gear mount.
When cured, remove the servos and then rein-
force all the joints with a small fillet of epoxy.
The servos will need extension cables of about
275mm (11"), so that they can pass through one
of the milled cutouts in the main spar, and then
to the centre section of the wing, and finally into
the fuselage for approx 125 mm. Tape the exten-
sion cables and connectors in place so that they
cannot come loose, or foul the aileron linkages.
Carefully drill and file the slots in the bottom
wing surface, just behind the servo cutouts, for
the pushrods to exit and connect to the aileron
horns. Make up the aileron linkages from the
hardware supplied, using M3 x 65mm all-thread-
ed rods, M3 nuts and steel clevises. Loctite the
clevise onto the aileron end of the linkage after
you have set up you have set up your linkages
and throws, as this removes the need for an M3
locking nut here - which would need a much big-
ger slot in the wing for clearance.
After the landing gear is completed, the retract
units and aileron servos are covered using the
thin painted fibreglass sheet supplied in the kit,
fixed with clear tape, in the same manner as for
the Stabilisers.
Speedbrake
The speedbrake is elastic-hinged in the laminat-
ing process, and is already cut free for you. It is
techsupport@composite-arf.com
(above/below) Alternative mounting method
for servos without integral 'wing mount' lugs.
Hinge Axis
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