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Composite-ARF Extra 300L (2.12m/84")
techsupport@composite-arf.com
ance and flying characteristics. The DA-50 pow-
ered version shown here is about 7.1kg, dry. Of
course, the final weight of your model will
depend a lot on the power plant 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 fuse-
lage 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 only has 5 or 6 servos, even if they are all
digital types as we have used here, a single receiver bat-
tery pack of 5 cells x 1400 mAH is normally quite suffi-
cient, or if you prefer, then 2 x 1200 5-cell NiMH packs
and a Powerbox Sensor switch as we have used here.
The Sensor switch incorporates both dual battery inputs
and outputs to the receiver, as well as a voltage regula-
tor 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.
PowerBox 'Sensor' switch
Wrap the batteries in foam, to protect the soldered joints
from vibrations and shocks. The location of your batter-
ies will depend on your motor choice and where they
need to be for correct C of Gravity. We glued a 5mm
thick balsa plate to the top surface of the exhaust tunnel,
in front of the tank base, and installed the ignition unit
and ignition battery on it. The 2 receiver packs are 5-cell
1200 mAH NiMH, and these were installed immediately
behind the rudder servo mount, as shown in the photo.
Of course, if you need more weight in the nose of the
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