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3S LiFe batteries are allowed in the case that 2s Lipo can’t be used, but if possible use 2s Lipo.
Using a higher battery voltage than 10V will damage the ECU.
Use at least 25C batteries, there is no upper limit. Do not use other battery types like LiIon, these
batteries cannot deliver the peak amperage (20-30A) necessary for starting.
Battery consumption
As example in mAh battery use, on average the X45 engine uses:
Start-up: 100mAh for X45
About 20mAh -30mAh for each minute running (depends on throttle position).
About 40mAh for cooling after a run.
A typical eight minute flight consisting of a start, normal flight and shutdown will consume:
100+(8x20)+40 = 300mAh
For the X90 these values should be approximately x1.2, for the X120 approximately x1.4.
Be sure to always disconnect the battery for charging. Some chargers use a high voltage pulse
system which can destroy the ECU.
Auto battery disconnect
The receiver may be turned off as soon as the aircraft is retrieved from flight, the Hub unit will
ensure the cooldown continues until the end. The Hub will then disconnect the battery after the
end of the cooldown.
When the receiver is turned back on, the Hub unit will reconnect the battery. At the end of the
flying day it is good practice to disconnect the ECU battery as safety measure because the ecu use
a very small amount of current that can drain a 2000mAH battery in 1-2 month.
Fuel
The engine can be run using Kerosene or Diesel fuel. Kerosene is the recommended fuel if availa-
ble; it produces the best user experience as the engine starts and accelerates faster, without
smoke, flames or unpleasant smell.
Diesel fuel is acceptable, the engine will not be damaged by using it, but user experience will be
worse. Power is the same using both fuels.
Recommended Kerosene fuel is the odourless refined Kerosene (some countries call it ”Paraffin”)
used in home stoves, there are different commercial brands like “keroclair”, “Ptx200”, “Petroleum”
as it is very clean and burns without smell. JetA1 will work the same but should be carefully fil-
tered before use, but its odour can be offensive during model storage.
Use the fuel preset in the START menu to select your fuel: Kero / Diesel. The ECU automatically
adjusts start settings for each fuel.
