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Composite-ARF SuperXtra 330L (3.1m span)
You have 2 choices for servo installation; you can make a
very long X-head screwdriver and insert it from the wing
root, which is quite tricky but neat - or you can cut a servo
hatch in the bottom of the wing surface. If you chose to cut
the servo hatch you will need to use the section of wing that
you cut out for the cover hatch, and reinforce the underside
of the wing skin with the plywood frames supplied in the
hardware for the securing screws.
The aileron horns are not factory-fitted, but it is an easy job.
Duplicate the angle and set-up from the inner aileron horns,
but make sure that the 3mm hole in the horns is 9mm fur-
ther out from the aileron surface, to get the same throws,
because the wing is 9mm thinner from the top-hinge axis at
this position. Mill the slots in the aileron, sand the portion of
the phenolic horns that will be glued inside, in the pre-
installed balsa block, and glue them in place with epoxy
and micro-balloon mixture - using the same method as
explained for the Stabiliser horns.
The pair of the shaped phenolic servo arms must be glued
on both sides of a standard plastic servo disc, in exactly the
same manner as for the inner servo (see photo page 23).
With the servos installed, using the 2.9Ø x 13mm sheet-
metal screws provided in the kit, cut a slot in the bottom
wing surface for the servo arms, and make up the linkage
from the M3 threaded rod, M3 aluminium clevise and ball-
link supplied.
Engine and Exhaust Installation
Here we show the installation of a Desert Aircraft DA-150 motor and MTW headers and mini-
pipes (available from C-ARF as an option) which is a highly recommended combination with lots
of power, yet lightweight. The DA-150 motor fits fully enclosed in the cowling, and no cutouts or
holes are needed. Of course many other engines in the 120 -150 cc range are suitable as well.
All measurements shown here are according to this set-up, but in the future we hope to add the
mounting dimensions for other popular engine and muffler combinations to out website.
The moulded motor dome is reinforced inside with plenty of carbonfibre during manufacture and
does not require any additional strengthening, and the plywood reinforcement plate is also
already installed for you. The firewall has no downthrust or sidethrust built in to it. When using
the DA-150 and a 32 x 10 or 32 x 12 carbon 2-blade propeller, it is usual that this combination
techsupport@composite-arf.com
(above) The outer rib in the wings
is already milled for the 3rd servo,
and has plywood reinforcement on
the outer surface as shown.
(below) An example of the linkage
for the outer servo the SuperXtra
wing, using the phenolic horns &
linkage hardware supplied.
(above) The additional hardware
included for optional outer servos.
Finished in 5-6 hours
25
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