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.
When the glue is cured and secure the phenolic arms to the
servo discs using at least 2 small sheetmetal screws (2.2Ø
x 10mm) in each. Make up the linkage between the 2 ser-
vos as shown, using the 60mm long M3 all-thread, 2 nuts
and 2 x M3 clevises.
Note that the back clevis is secured between the 2 arms on
the back servo with an M3 x 16mm bolt and locknut, but the
nut must
not
be over-tightened or it will prevent smooth
movement. The front clevis is secured using the pin and ‘C’
clip provided. Carefully adjust the length of the linkage so
that there is no ‘buzzing’ from the servos at neutral or full
throw positions.
Then make up the linkage that goes from the end of the
back phenolic arm to the aileron horn, using the 90mm long
M3 all-thread, one clevis, 2 x M3 nuts and an M3 ball-link on
the end. As before the clevis are secured between the 2
phenolic horns with an M3 bolt, and the nut must
not
be
over-tightened. We advise one drop of Loctite on the bolt
threads so that the locknuts definitely cannot come loose.
Important:
Note that both clevises on the rear phenolic
servo arm are fitted to the
outside
horn, to keep all the
forces in line. This is important to make sure there are no
twisting moments, which could cause aileron flutter.
Install the completed aileron plates in the wing, using a long
X-head screwdriver and secure with 10 of the 2.8Ø x 14mm
sheetmetal screws provided, into the holes that are drilled in
the carbon-composite rib for you during manufacture. Be
careful not to trap the servo cables between the phenolic
servo mounting plate and the rib.
Check that the phenolic servo horn and linkage align with
the dual control surface horns in the aileron. With the R/C
switched ‘On’, adjust the length of the linkage to the aileron,
and connect the ball-link between the horns with an M3 x
16mm bolt and locknut. You may need to make the slot in
the wing a little wider to clear the bolt and locknut on the
phenolic servo arm at full throw.
Composite-ARF SuperXtra 330L
(3.1m span)
24
(above) Please position the horns
and clevises exactly as shown here
to ensure no twisting moments
which could cause aileron ‘flutter’.
(below) The completed phenolic
servo tray is installed in the wing,
screwed to the carbon-composite
rib with the standard servo screws
and rubber grommets.
(below) The completed aileron
linkage, using all the hardware sup-
plied with the model.