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Composite-ARF Yak 55 (2.1m/83")
techsupport@composite-arf.com
formance and flying characteristics. The DA-
50 powered version shown here is about
7.1kg, dry. Of course, the final weight of your
model will depend a lot on the power plant
and battery type used, and if you decide to
add any trim or paint to the model.
Receiver and Antenna
The receiver can be fitted anywhere you like,
but the position shown on the back of the tank
base works well, and it is easily accessible.
Please protect it from vibration and shocks by
mounting it on some foam rubber, and don't
forget to secure the receiver crystal into the
Rx with a piece of clear tape.
Run the antenna wire along the side of the
fuselage in the cockpit area, taped in place,
and then vertically through the top of the
fuselage (in a piece of silicone tube) behind
the cockpit and back towards the vertical
stab. We often fit a short length of plastic
tube, vertically behind the cockpit, for the Rx
antenna and this does seem to give excellent
range. Keep it as far away as possible from
the cables for the elevator servos and the
closed-loop rudder wires.
Composite-ARF strongly advise you to keep all the cables between the motor ignition battery,
ignition switch, and gas-engine ignition unit, as far away as possible from the Receiver and
Antenna.
Batteries and Switches
As this model has 5 or 6 powerful digital servos, we highly recommend that you fit dual Rx bat-
teries, and here we have used 2 packs of 5 cells x 1400 mAH and a Powerbox Sensor switch.
The sensor switch incorporates both dual battery inputs and outputs to the receiver, as well as
a voltage regulator for 5-cell packs which regulates the voltage to 5.9 volts. You can use this
switch with 1 or 2 battery packs. An excellent lightweight unit that is available from Composite-
ARF as an option.
Wrap the batteries in foam, to protect the soldered joints from vibrations and shocks. The loca-
tion of your batteries will depend on your motor choice
and where they need to be for correct C of Gravity. The
2 receiver packs are 5-cell 1300 mAH NiMH, and these
were installed immediately behind the rudder servo
mount, as shown in the photo. Of course, if you need to
add weight in the 'plane to achieve the correct Centre of
Gravity, it is better to install a larger battery - rather then
add lead. When using a gas engine we highly recom-
mend a 'Powerswitch' for the ignition cut-off, which is
also available from C-ARF.
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