Composite-ARF SPARK Instruction Manual page 34

Composite-ARF SPARK
Rx Battery
The receiver battery is positioned to set the
exact CG of the model, and in our prototypes it
needed to be installed just behind the EDF unit.
We used a 1500mAH 2 cell Lipo pack (7.4 volt),
which only weighs around 70 grams, and fixed it
securely to the bottom of the fuselage, under the
thrust tube. An extension cable is then routed
along the fuselage side to the Digi-switch in the
nose. Typical current draw from these small ser-
vos for a 5 minute flight is less than 80 mAH.
Disconnect the Rx Lipo battery from the Digi-
Switch when the plane is not in use.
EDF Connections and Operation
The Schübeler DS-75 fan unit and the Jeti Spin 99 speed-controller come pre-wired for you, at
the correct length for this set-up in the Spark. The gold connectors are already soldered on to
the correct length wires for you; the 3 connectors between the speed controller and fan motor
are Ø 3.5mm, and the ones on the Lipo packs and input to the speed controller are Ø 4mm.
The Speed-controller has one long JR-type extension lead from the front of it, which must be
connected to the throttle channel of your RX, using an extension cable. The other (shorter) cable
from the controller has a red plug on the end of it, and this is for connecting to a Jeti-Box display
terminal that can display various data, and adjust motor timing etc. When not in use we suggest
that you apply a small piece of tape over this red connector to prevent accidental short circuits.
The 3 black wires from the motor run along the top of the inlet joiner and plug into the 3 color-
coded (red, yellow and black) wires of the speed-controller. It does not matter which of the black
wires is plugged into which color wire of the controller the first time, but if the fan unit runs in
reverse the first time you switch it on, then you must swap any 2 of the 3 wires to reverse the
techsupport@composite-arf.com
(below) A 2 cell Lipo of about 1500mAH is
enough for the RX power, as the small servos
draw very little current.
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