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Composite-ARF Extra 300L (2.12m/84")
techsupport@composite-arf.com
Wings
The wings are 95% finished at the factory, and
have already been installed on your fuselage to
check alignment. They fit on a 30mm Ø alumini-
um alloy spar tube, with 6mm Ø fibreglass rod
anti-rotation pins at the front and back, which
are all completed for you. Each wing is secured
to the fuselage with a large M6 plastic nut, that
screws onto the bolt that is factory-installed in
the wing root. All you need to do is mount the
servos, glue in the aileron horns and make up
the linkages using the included hardware.
Please double-check now that the front and rear
anti-rotation pins, and the M6 plastic wing bolt,
are securely glued into the root ribs of the wings.
You can also check the inside structure of the
wings easily at this point, thru' the cutouts in the
root ribs - to make sure that all critical compo-
nents are properly glued in position.
Glue the phenolic aileron horns into the milled
slots in the same way as the elevator horns,
making sure that the clevise holes are perpendi-
cular to the hinge axis. As before, we advise you
to fit just one horn first, then make a template
(see photo right) to ensure that the other horn is
positioned the same.
Servo choice: We highly recommend using a
hi-torque digital servo (eg: JR/Graupner
8511/8611 or Futaba S9351) for each aileron as
the surfaces are very large. We also strongly
recommend that you secure the phenolic servo
arm extensions to metal output discs on the ser-
vos, and not plastic discs. See page 16.
The servo hatches are pre-cut in the wing, and
supplied with matching servo covers and CNC
milled plywood servo mounts. Sand the inside
surface of the servo hatch covers and the milled
plywood parts that make up the servo mounts to
make sure you have a good gluing surface.
Assemble the servo mounts from the milled ply-
wood parts for each servo, using thin CA and a
90° square. Fix the servos into the mounts with
the Ø 2.9 x 13mm screws, and place them on
the hatch covers to check that the servo arms
are in the centre of the slots milled in the hatch
covers, and aligned with the aileron horns. Don't
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