User Manual
X45
Version 1.0/2019
Copyright © 2019 by Xicoy Electrònica S.L. All rights reserved
Page
24
In case you see the plane begins to stall
or an uncontrolled landing is most likely,
IMMEDIATELY set the trim
and stick to STOP
position to abort the restart function. A crash with the engine running normally ends with a
fireball; a crash with the engine off is not likely to catch fire.
Do not use the “digital trims” to shut down the engine, use a dedicated switch to be operated quickly.
If the engine restart is initiated while on approach
, evaluate if the speed/position of the plane is still good for a
safe landing, if so, land immediately, you don’t know why the engine stopped and may stop again during a “go
around” but this time the aircraft may not be in an as favourable position. If the position/speed of the plane is not
convenient, use the engine power to go around and plan for a normal landing, BUT land as soon as possible.
Once the plane is on the ground
, even in normal landing or crash landing, set the transmitter in the STOP
position. The engine could restart and go to full power on its own; the ECU does not know when the plane is on
the ground.
“
Can I use the restart function many times”?
NO!
Restart function is an
emergency
procedure
and places a high stress on the engine ancillary components. The
starter and ignitor are fed with extra power that is not used in normal startups, this places considerable more wear on
them, also the engine is subjected to abrupt temperature changes that could shorten its life.
Restart function is not the replacement of a poor fuel system.
It can save a plane in particular circumstances, but
it can do much more harm than good. A belly landing or landing gear damage due to a flameout induced heavy
landing is more favourable than a similar landing arrival with the engine in start phase that can possibly cause a fire
and result in total destruction of the model and or property.
Please consider carefully before enabling the auto-restart feature.
Never test the auto-restart function by closing the fuel line after the pump, this could cause a overload in the pump
that can damage it.
Disclaimer
There are no circumstances Xicoy Electronica SL or any of its Service Agents and employees will accept or be
held responsible for any losses or damages the Auto Restart feature causes should the owner operator choose to enable
this function.
Throttle curves
The ECU controls the RPM in linear way, i.e at half stick position the engine turn at half of the rotor RPM range.
However, jet engines develop thrust in exponential way, meaning half RPM means approximately ¼ of thrust. On
small engines with a high idle to full power rpm ratio, or in a high drag/low power planes, often only the last 1/3 of the
throttle stick produce significant thrust, with the low half stick travel being not much used. Although with current
digital TX the pilot can modify the throttle curve to suit needs, three throttle curves have been added to simplify the
setup for most of the installations.
These curves are selected under the RADIO menu:
FULL EXPO
: Means thrust is linear to RPM, it is the default setting. Thrust develops exponentially, and it is the
recommended curve for high thrust/weight ratio planes, as it ease the control in low power used during taxi.
