ROBBE FX-20 - Throttle Hold and Swash Mixer; Throttle Hold; Autorotation Settings; Swash Mixer Operation

FX-20
13.4 THR HOLD (AUTOROTATION SETTINGS)
Initially, this setting does not assign the throttle hold switch.
Prior to adjusting the parameters for the throttle hold, we sug-
gest designating a throttle hold switch. To do so, access the
Condition menu within the Helicopter Model Menu options and
activate HOLD to operate with a convenient switch such as
SG..
This function sets the throttle cut position for autorotation
landings. The throttle servo operating speed can also be adju-
sted. (Speed) Select [THR HOLD] from the Model menu and
access the setup screen shown below by touching the RTN
button.
Use the Condition select menu of the Model menu to assign the
hold condition switch.
For example: SG
Finally adjust the Hold position by moving the cursor to the
hold position item and touch the RTN button to switch to the
data input mode. Adjust the %age rate of the “HOLD POS” by
scrolling the touch sensor to set the throttle hold position.
Then move the cursor to the servo SPEED item and touch the
RTN button to switch to the data input mode. Adjust the rate by
scrolling the touch sensor. The pre-set is 0 and the adjustment
range is 0~27 (maximum delay).
Take care when starting the motor that THR HOLD and IDLE
UP are switched off.
13.5 SWASH MIXER
The swash mix function is used to trim the swash plate in the
aileron (roll) direction and elevator (cyclic pitch) to compen-
sate for any unwanted interactions occurring when any flight
condition (NORMAL, HOLD and IDLE UP) is in operation. This
function allows the independent rate adjustments of the aile-
rons, elevator and pitch. Four mixers are available for each
mix, two mix rates are active and an operating switch may also
be assigned.
Select [SWASH MIX] in the Helicopter Model Menu and con-
firm with “RTN”. The set-up Displays are:
In the second Display, move the cursor to the [ACT] item and
touch the RTN button to switch to the data input mode. Select
the ACT mode by scrolling the touch sensor. The display blinks
and touch the RTN button to activate the mixing and return to
the cursor mode. (ON is displayed.) The compensation mixing
is made in the first Display and programming is made in the
usual manner.
Virtual Swashplate Rotation (adjustable from 0-45°)
To achieve an adjustable virtual swashplate rotation of 45°,
activate the first two mixers with a mix rate of 100% and Trim
“ON”. To finely tune possible swashplate control interaction
differences, it is possible to achieve “straight and level” flight
with the helicopter with mix settings with only small differences.
Selecting the Helicopter Model Type H4X makes a fixed Virtual
Swashplate Rotation of 45 degrees.
Model menu helicopter
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