Installing The Radio Control System - GRAUPNER Skalar Manual

Skalar
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2. Installing the radio control system

(bag SKA-9)
2.1 Fitting the servos
Fix brass balls to the inside of the output arms on the pitch-axis servo (1) and the roll servos (2)
+ (3) using M2 x 10 cheesehead screws and M2 nuts, with the nuts on the outside. Apply a drop
of thread-lock fluid between screw and ball and also to the nut. The distance (lever length) from
ball centre to servo shaft centre should be about 18 mm. Install the pitch-axis servo first: fit it in
the servo aperture in the right-hand side frame from the inside, with the output shaft at the top,
and secure it with four screws, rubber grommets and metal spacer sleeves (all parts supplied
with the servo): the tubular spacers must be fitted into the underside of the grommets, the
screws fitted from above.
The servo mounting holes in the mechanics are deliberately offset slightly towards the outside,
so that the rubber grommets are under slight tension when the servo is installed; this helps to
produce even more precise control.
Fit the roll servos into the right and left side frames from the outside (see drawing; output shafts
at the top again), and secure them with four screws each. Connect the servos to the receiver in
the sequence described in the radio control system instructions. Switch on the RC system and
activate the swashplate mixer in the transmitter (setting: symmetrical three-point linkage, two roll
servos, 1 pitch servo at the rear). Set the collective pitch, pitch-axis and roll controls and trims to
neutral, and fit the servo output arms on the servos at right-angles to the rotor shaft. Fit the
servo output arm retaining screws.
Install the tail rotor servo in the left-hand side frame from the outside, with its output shaft at the
top, and screw it in place. The tail rotor servo output arm must face down, and should be parallel
to the main rotor shaft when the transmitter control for collective pitch is set to centre.
Run the servo leads through the vacant front servo aperture in the right-hand side frame, bundle
them together and wrap them in spiral tubing. Run the leads forward to the receiver along the
right-hand side of the mechanics. Take particular care to deploy the servo leads neatly and
safely. No cable should be allowed to touch any shafts or gears (potential crash hazard if a cable
chafes and rubs through).
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