Spektrum BEAST X AR7210BX Mode D'emploi page 26

EN
Nitro
In "nitro" mode, the throttle servo can be controlled via the throttle channel of the remote control
as long as the RPM Governor is switched off. Only when the RPM Governor is switched on this
will take over control of the throttle servo to spool up the rotor to the desired speed (if this is not
yet reached) and ensure that the rotor speed is maintained during the flight. The manual throttle
control is necessary to start and warm up the motor as well as to stop the motor after flight.
Also some model motors react very sensitive in the lower throttle sector and abrupt engagement
can cause the motor to quit, i.e. when the clutch is not fully engaged and/or the rotor is not yet
turning. In this case, manual throttle control can be advantageous as the pilot can run the motor
to speed by hand before control is passed over to the RPM Governor.
Depending on whether an auxiliary channel was assigned to control the RPM Governor in the
Channel Assignment Menu or not, the RPM Governor is either controlled separately via this
channel or you can control both RPM Governor and throttle servo alone by using the throttle
channel of the transmitter. In general, the adjustable throttle range in "nitro" mode is 2400 RPM.
The lowest head speed to govern is 600 RPM, the maximum head speed is 3000 RPM.
Nitro Governor with Auxiliary Channel
If a separate control channel is used for the RPM Governor, the throttle servo can be controlled as
usual via throttle channel and throttle curves of the transmitter. By switching the separate control
channel in different positions, the RPM Governor can be activated and the desired rotor RPM can
be preset. Note that for safety reason the throttle channel has priority over the RPM Governor when
the output is below 25%. So you can always control the lower throttle servo positions by hand, even
if the RPM Governor is already switched on. Then when the throttle is raised above 25% the RPM
Governor intervenes and spools up the rotor. Also when you want to bring the throttle servo to idle
position for autorotation or to shut off the engine you can always do this, regardsless of how the
RPM Governor is switched. The Spektrum AR7210BX will be set to autorotation bail out mode if
the RPM Governor is switched on and the throttle channel is brought below 25%. When throttle is
increased again, the RPM Governor will speed up the rotor faster than on initial spool up! Therefore,
if you make a stopover and the rotor is completely stopped, the RPM Governor must be completely
disabled once by using the separate control channel. So the RPM Governor is reset and will perform
an initial startup again. Otherwise if autorotation mode would still be active, the helicopter may tip
over due to the abrupt speed up (this does not apply if you set the bail out spool up rate at Parameter
Menu Point K as high as the initial spool up rate).
Normal flight mode
• Throttle curve controls throttle
• RPM Governor off
Throttle curve
(throttle channel)
100%
50%
0%
Status-LED OFF
26
Governor
channel
100%
0%