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Composite-ARF SuperXtra 330L (3.1m span)
tube. The centre of the hole should be about 34mm from
the trailing edge of the stab. Thread the hole with an M3 tap
and secure it with an M3 x 16 bolt. To be really secure, you
can glue an M3 blind nut inside the stab spar tube, as
shown here, with some 30 minute epoxy and micro-bal-
loons. Wax or oil the bolt first!
Fit both stabs to the fuselage, check that they fit tightly to
the fuselage at the roots, and then drill the hole in the other
stab and spar tube, thread as before, and secure with
another bolt. Counterbore the holes in the bottom surface
of the stabs for the boltheads so that they fit flush (see
canopy frame section).
Note: Try to always leave the stab tube fixed in one stab,
and never remove that one bolt, as it is very difficult to
find the right position for the stab tube again if it is
removed from both stabs!
Rudder
Fit the rudder to the vertical stabiliser with the 4mm Ø brass
tube supplied, in the same way as the elevators. Check for
smooth movement. The dual phenolic rudder horns are
already glued in place at the factory during manufacture.
The rudder is a huge surface on the Extra 330L and the
choice of servo is up to you. For pattern flying 4 hi-torque
servos (eg: JR4421) would probably be sufficient, but if you
plan to fly 3D or radical freestyle we highly recommend
using 4 power servos, like the JR8411's shown in this
installation, or 8511/8611's. You will be pleased you did!
Make up the Rudder tray from the milled carbon-plywood
parts supplied. Prepare all joints by sanding, and assemble
as shown, using thin CA to secure all the tabs and slots.
Cut 8 small pieces of plywood from the strip supplied and
epoxy onto the bottom of all the servo rails. Finally reinforce
all joints with epoxy and micro-balloons mixture. Drill the
2mm Ø holes for the servo mounting screws before gluing
the assembly into the fuselage - it's much easier!
Finished in 2 hours
20
techsupport@composite-arf.com
(above) The completed inner ele-
vator linkage. You can also see the
head of the M3 retaining bolt, with
the bolt head counterbored flush
into the surface of the stab.
(below) M3 blind nut glued inside
the stab spar tube with 30 minute
epoxy and micro-balloons mix.
The Rudder tray and Fuel tank
base are assembled from the
milled carbon parts & plywood
strip included, as shown below.
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