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SPEKTRUM DX18t • TRANSMITTER INSTRUCTION MANUAL
EN
Governor
Tail Curve
Mixing
Gyro
The Gyro menu option enables you to assign a gyro gain value to an independent switch
or a Flight Mode. Assign the receiver channel connected to the gyro, then assign the switch
for gyro options. You can also assign values to available switch positions (from 1 to 5 rates
are available, depending on the switch assigned). Make sure the gyro operates correctly
and compensates in the correct direction.
The governor function
is used to set the rotor
head speed when
used with a governor
installed in the heli-
copter. The governor
will control the engine
RPM to maintain the head speed desired. You can program values
for each switch position or flight mode. RPM values can be pro-
grammed in 0.5% steps.
To Program the Governor Function
1. Access the Governor menu option.
2. Program the RPM values by rotating the scroll wheel
to the desired value.
3. Press the scroll wheel and rotate it to the desired value.
Press the scroll wheel again to save the value.
IMPORTANT:
The value in the display is the corrected value.
0% is 1.5ms or OFF for most governors. Repeat this for all
governor settings.
4. Assign the output channel for the Governor. The Governor and
the Gyro must be on different channels. We recommend using
AUX2 for the Governor output channel.
5. Select a switch to control the Governor.
6. Press the BACK button to save the selections and return
to the Function List.
The Tail Curve function mixes tail rotor input with the throttle/collective function to counter
torque from the main rotor blades when using a non-heading hold (tail lock) gyro or when
using rate mode on a gyro. See Pitch Curve for more information on programming curves.
Cyclic to Throttle
Cyclic-to-throttle mix
prevents rpm loss
when aileron, elevator
or rudder inputs
are given. This mix
advances the throttle
position with cyclic or rudder control to maintain RPM. At full
throttle, Cyclic-to-Throttle mixing prevents the throttle from
overdriving the servo.
IMPORTANT:
Do not use Cyclic to throttle mix when using
a governor.
To verify that the Cyclic to Throttle mix is working properly and in
the correct direction, move the flight mode switch to one of the
active positions. Move the programmed cyclic or rudder channel,
noting the throttle position. The throttle position should increase.
If the throttle decreases, then the opposite value (positive vs.
negative) is needed.
Swashplate
The Swashplate Mix typically corrects swashplate timing issues by
mixing Aileron to Elevator and Elevator to Aileron. When adjusted
correctly, the Swashplate causes the helicopter to roll and pitch
accurately with minimal interaction.
