you have fitted both servos with
the same orientation. In that
case you will need to purchase
either 1 'reversed' servo - or
use an electronic reverser on
one servo (eg: JR Match-box).
The added advantage of using
a 'Match-box' is that it allows
you to separately set the neu-
tral points & end-points of up to
4 servos on a single Rx chan-
nel servo to match each other.
Decide on the orientation of
your servos, and trial fit the 'U-
shaped' milled lite-plywood
mounts, which are sized to suit
the DS161's (and the Hitec
#HS-5125MG). The wider part
fits towards the leading edge of
the stab, and the back of the
mount will be glued against the
rear spar in the stab. Remove
the mounts. Centre the servos
using your Transmitter, fit the
servo arms at 90° to the servo
case, set the travels to 125%
(or maximum) and screw the
servos onto the mounts. Sand
the bottom surface of the
mounts and the inside of the
stab skins in the servo pockets
carefully for a good glue bond.
Do not glue them in place yet!
Mark the position against the
inner edge of the hatches
where the servo arms will be,
and file slots in the skin for
them as shown. Now you can glue in the mounts into the stab, with the servos in place and the
servo arms exactly perpendicular to the leading edge of the elevators. Use a 30 minute epoxy and
micro-balloons mixture, and make sure that they are properly glued to the rear balsa/glass spar
in the stab. When the glue has cured, remove the servos and add glue to any parts that are not
properly bonded, making sure that they are well fixed to the rear balsa spar in the stab.
Tape the elevators into the neutral position. Carefully mark the line (on masking tape) of the link-
age, exactly in line with the servo arms. The control horns are made from the 35mm lengths of M3
threaded rod included in hardware. There are small plywood blocks installed in the elevators for
the horns during manufacture. Drill right thru' the elevator on the marked line, exactly 10mm be-
hind the front edge of the elevator, using a sharp Ø 2.2 or 2.3mm drill. Use a 90° square to keep
the drill perpendicular to the bottom surface of the elevators. The holes should be just behind, or
against, the balsa elevator spars.
Fox Composites Co., Ltd.
6
(above) Digital DS161 servos are installed in the milled ply
mounts supplied in the kit. Cut slot as shown for servo arm.
(below) The elevator horn must be installed in line with
the servo arm, and 10mm behind the leading edge of ele-
vator. Drill Ø 2.2mm, and tap M3 for the M3 threaded rod.
