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Composite-ARF Extra 330L (2 x 2m)
techsupport@composite-arf.com
The slots are already milled in the elevators for
the horns. It is important that the horns are both
in identical positions in relation to the hinge axis
- which is on the top surface of the stab - to be
sure that you have equal elevator movements.
Put a layer of tape over the area of the milled
slot, wax it, and then cut through the tape with a
sharp knife to allow the horns to be glued into
the slots. This stops excess glue getting on the
surface of the elevator. Adjust the slot in one ele-
vator so that the holes for the clevise are exact-
ly perpendicular the hinge axis, rough up the
gluing surface of the horn, and glue it in with
30min. epoxy and microballoons.
When the glue has cured on the first horn,
remove the tape, and make a horn alignment
template from thin plywood (see photo in wing
section) and a 1.6mm drill or piece of wire, and
use it to install the horn in the other elevator.
This ensures identical elevator throws.
Make up the extension leads for the 2 elevator
servos, with ceramic chokes/ferrite rings on the
servo ends, and centre both servos with your R/C. Rough up
the outer surface of two 25mmØ plastic servo output discs
with a Permagrit or 60 grit, and do the same on the inner
surface of two of the phenolic C-ARF servo arms supplied.
Tack glue the phenolic arms to the plastic discs, making
sure that they are both exactly at 90° to the bottom surface
of the stabs. Remove both and secure with 2 of the small
sheetmetal 2.2Ø x 10mm screws supplied.
Make up the elevator linkages from the 60mm long M3
threaded rods, with 2 clevises and 2 x M3 nuts for each stab. 'Loctite' the quick-link and lock-nut
on one end of each linkage. Add a couple of short lengths of silicone tube over the clevises to
prevent them opening accidentally. Do NOT use ball-links on the servo arms or the control-sur-
face horns, because they will twist the servo arm/horn and cause flutter. This is a solid experi-
ence and you should consider it a FACT.
Next fit the M3 stab retaining bolts. Inside the stabs you will see a small plywood reinforcement
plate between the spar sleeve and the bottom surface of the stab. Mark the bottom of both stabs
in the centre of this plywood. Install the carbon tube into 1 stab, and drill a 2.4mm hole right
through the stab surface, the plywood plate, sleeve and into the carbon tube. The centre of the
hole should be about 26mm from the trailing edge of the stab. Thread the hole with an M3 tap
and secure with an M3 x 16 bolt. Then glue an M3 blind nut inside the stab spar tube, with a lit-
tle 5 minute epoxy and micro-balloons, but be careful of adding weight here. Wax the bolt first!
Fit both stabs tightly to the fuselage, and then drill the hole in the other stab and spar tube, thread
and secure as before. Counterbore the holes in the bottom surface of the stabs for the boltheads
so that they fit flush (see cowling section). Put a piece of clear tape over the bolt heads for flight.
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