Composite-ARF SPARK Instruction Manual page 15

Composite-ARF SPARK
bly need to be enlarged a little, depending on
your servo choice. Do not cut through the car-
bon rovings on the top and bottom edges of the
balsa spars if you enlarge these servo hatches.
Sand the front edge of the forward servo mount
so that it is only 4 - 5mm wider than the servo,
so that the servo is positioned as far forward as
possible in the stab, where the profile is thickest.
Check for a good fit against the back of the for-
ward spar. Then mark where the back mount
needs to be sanded at an acute angle to clear
the rear spar, and sand it to fit also. Check that
the servo output arm is exactly in line with the
fuselage centreline and elevator horns.
Carefully prepare the inside
surface of the foam sandwich
for gluing, by sanding lightly
with 120 grit and cleaning off
any dust with a little Acetone or
equivalent (eg: Lighter fuel).
Glue the complete
mount assemblies into the
stab using a little slow epoxy
and micro-balloon mixture -
being careful not to use too
much or you will glue the ser-
vos in also! When cured,
remove the servos and rein-
force all joints with a small fillet
of epoxy.
Run the 2 short servo extension cables out thru' the top surface of the stab, just inside the edges
of the fuselage, using the 6mm rubber grommets supplied. Open them up with needle-nosed pli-
ers to get the connectors through them. Make up the linkages from the M3 x 60mm threaded
rod, M3 nuts and steel clevises as shown. Test the servo travel, throws and centering, not for-
getting to add a drop of Loctite to one end. The clevise on the linkage needs to be in the hole
that is 16mm (5/8") from the centre of the servo.
Cut the servo covers from the painted fibreglass sheets supplied in the kit, and secure them to
the stab surface with clear tape as shown.
Make up the extension lead needed from your servo to the nose area, for RX connection, and
route it down the side of the fuselage to the nose area now.
servo
15
techsupport@composite-arf.com
(above) The servo cables exit close to the
side of the fuselage, thru' plastic grommets.
(below) The servos are covered with the pre-
painted fibreglass sheet included, secured
with clear tape as shown here.