This system means the ECU does not have to spend time constantly controlling the pump speed, it only
needs to send a brief signal to request a certain rpm. The onboard controller then looks after how this
command is carried out and confirms it back when this is achieved. This enables the ECU to do other
things like updating telemetry or collecting data from sensors, while still controlling the engine operation.
Pump pre-setting
Used to be called Pump Start Point on old engines. The pump initial flow rate is set
at the factory with the engine by simply setting the minimum rpm it produces sufficient heating from the
burner for a start. This is the only required adjustment. Once set, the user needs make no adjustment to
pump commands. Being based on a powerful brushless motor it does not suffer from sticky seals or
variable speeds due to atmospherics or fuel densities unlike regular DC motor based pumps, so the old
jiggle with an adjustable “pump start point” is no more.
Applying a DC voltage to the fuel pump will not make it run so please do not try it. Modifying the cable
and reverse connecting the polarity of the power supply wires will also
not
make it run but may destroy
the internal pump controller, so don´t risk ruining your pump by modifying your cable, just get the right
length you need.
ECU Display
There are two display options with the X45 engine depending on which
package you select, Compact or Lite.
The Compact Hub is a Hub and screen combined in one box. It has its own
buttons and is backlit. This type does not record flight data.
It weighs 22g/0.77oz.
The Lite option includes the small shrinkwrapped Hub and separate colour
display connected via a servo type lead. This can be plugged into the Hub
as required for making adjustments and then unplugged, or can be
connected and permanently installed in the airframe where it will record
flight data (see below).
The small Hub and screen together weigh 28g/1oz
Both displays include dedicated screens for engine operation, radio checking, last shutdown cause and
other special turbine operations.
Hub Lite data record / playback
(Note, this function requires the Hub Lite colour display to be mounted in the model)
One innovative and useful function is the internal recorder/playback function which is contained in the
Hub Lite colour display. If mounted on the airframe the colour display continuously stores all the data
received from the ECU, keeping in its permanent memory all the data of last 66 minutes of engine run,
without the need of a memory card.
After flight the display can be removed from the airframe and be powered up with a receiver type battery
and the data stored can be played back in real time, same presentation as if the engine was running.
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