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7)
The signal cable from the gearbox rpm sensor should be plugged in alongside the pump outlet
with the same orientation. On the Compact Hub it is marked "Aux". There is no specific marking on the
Hub Lite but it should go below the pump outlet.
8)
If the ECU battery has to be sited at some distance perhaps in the tail for a heli, please contact
Xicoy and ask for a longer cable in one piece. Please don´t cut it and splice in a couple of old bits of wire
to make it longer as this is surely a recipe for troubles and is a regular candidate on engines presented
for service. A heavy duty extension can be used but check polarity before plugging in. Its always better to
have a longer single piece cable for minimum volt drop and maximum reliability.
9)
The ECU battery should ideally be sited somewhere it can be easily accessed. It is good practice
to disconnect after flight or before travelling anywhere with the model.
Note it is extremely important to disconnect the battery whilst charging, as the usual pulse type
charger can easily destroy the ECU, and is in any case a sensible precaution with rechargeable
batteries.
10)
The centre of the fuel tank should be located as close to the centre of gravity (CofG) of the
model as possible. This will minimize the effects of the CofG shifting as the fuel is used during the
flight.
11)
The fuel tank should have an effective fuel pickup, like a felt clunk or felt bag over a weighted
clunk to ensure no air is pulled into the fuel feed. A UAT or similar can be used.
Fuel Tank
A bubble-trap (like the Xicoy and BVM models "UAT") type hopper tank system is highly recommended
(and available in the Xicoy Jet Shop). The bubble-trap outlet feeds direct to the inlet to the filter. If using
an air trap which has a fine bag type filter (Xicoy) then the external filter CAN be omitted but beware the
pump is vulnerable to particles getting in between bubble trap and pump inlet, so aim to be squeaky
clean with the installation.
12)
A tank capacity of around 800cc/30oz to 1000cc/35oz is suitable for 6-10mins flying for
helicopters, and 1200cc/40oz to 1500cc/50oz suitable for the same times on turboprops.
Vent
Fill point
Fuel Pump
Air Trap
Page 19
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