Spektrum SPM18100 DX18 User Manual

Page 37

SPEKTRUM DX18 • TRANSMITTER INSTRUCTION MANUAL

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.

Governor

The governor function is used to set the rotor head speed when
used with a governor installed in the helicopter. The governor
onboard will control the engine RPM to maintain the head speed
desired. You can program values for each switch position or fl ight
mode. RPM values can be programmed 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.

Tail Curve

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.

Mixing

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 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.

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.