Spektrum DX18 SPM18000 User Manual

SPEKTRUM DX18 • TRANSMITTER INSTRUCTION MANUAL

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 adjusts the engine RPM. You can program 
values for each switch position or fl ight mode. RPM values can 
be programmed in 0.5% steps.  

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.

  NOTICE: 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 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 fl ight 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.

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.