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Composite-ARF SuperXtra 330L (3.1m span)
Wings
The wings are 95% finished at the factory, and have already been installed on your fuselage to
check the alignment. Even the dual phenolic aileron control surface horns have been installed
for you. Slide the wings onto the 50mm Ø wing spar tube and check for a perfect fit. You can
sand the edges of the wing roots a little if needed. Fit the 4 plastic wing retaining nuts onto the
M6 threaded wing dowels. You may need to sand the edges of the spar cutouts in the sides of
the fuse a little bit so that the spars don't touch the edges of it.
The standard wing set-up is for 2 servos for each aileron,
which are installed in the CNC-milled phenolic plate sup-
plied in the hardware package. This plate is designed to
accept a pair of JR8511/8611 servos, which we strongly
recommend for this plane, although JR/Graupner 8411's or
similar servos will also fit, and should be sufficient if you
only plan to fly 'pattern' manoeuvres rather than 3D style.
Note: As an option you can install a 3rd aileron servo, in the
outboard wing rib, for extra 'snap' response. For 3rd servo
installation, see page 25.
The phenolic servo plates are identical, and there is no
'front' or 'back'. First fit the JR8511/8611 servos into the
plate as shown, using the supplied M3 x 12 bolts, small
washers and M3 locknuts on the back face, without using
the rubber grommets supplied with the servos.
Use a steel straight-edge to make sure that both servos are
parallel. Then fit the rubber grommets and brass ferrules
(supplied with the servos) into the 10 milled slots around
the edges of the phenolic plates as shown.
Prepare the 25mm Ø servo arms and C-ARF phenolic
servo arms as usual, by rough sanding for a good glue joint.
Note that one of the long phenolic arms will need the cen-
tral hole re-drilling to fit over the centre boss on the under-
side of the standard plastic servo disc (Ø 10mm for
JR/Graupner servo arms) as shown in the photo.
Fit the plastic servo discs to the servos and centre them
both using your R/C system. Using a small 90° square as
shown, set the shorter single phenolic arm on top of the
plastic servo arm on the front servo, and glue in place with
a couple of drops of thick CA (or slow filled epoxy), making
sure that the output hole for the clevis is at 90° to the cen-
treline of the servos.
Do the same with the 2 phenolic arms for the back servo,
sandwiching the plastic servo output disc between the 2
phenolic arms as shown. Again make sure that the hole for
the clevis is at 90° to the centreline of the servos.
techsupport@composite-arf.com
Finished in 4 - 5 hours
(above) The JR8511/8611 servos
and supplied mounting hardware.
(below) The 3 phenolic servo
arms, prepared before gluing and
screwing in position.
(above) Check carefully for neutral
alignment of the C-ARF horns on
the standard servo discs.
23
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