Servo Connections And Auxiliary Channels; Servo Selection; Preparing The Transmitter For Flybarless Operation; Receiver Installation - Spektrum BEASTX AR7210BX User Manual

Servo Connections and Auxiliary Channels

Servo Selection

Select servos that are adequate for flybarless operation. The servos must have high torque in
addition to being fast and precise. A poor servo-rotor blade combination will cause several
issues including oscillation while hovering and unwanted reaction in fast forward flight.
Connect all servos to the Spektrum AR7210BX. Refer to the diagram below for your particular
helicopter's cyclic servos.
Mechanical
Mixer
CH3
CH2
CH1
Auxiliary Channel
Do not attach the servo horns for now to prevent servo binding when powering the system
for the first time. Channel 5 is internal to the receiver used for tail gain/operating SAFE
technology. At Aux2 and Aux3 ports you may connect additional servos or functions, i.e. retract
landing gear or position lights.
NOTICE: The Aux2 port is not available for additional functions when using the RPM
Governor function.

Preparing the Transmitter for Flybarless Operation

1. Create a new model in your transmitter's model memory.
2. Be sure all trims/sub-trims are disabled (zeroed) and all servo travel values are 100%.
3. Set your transmitter's swash type to mechanical mixing (1 Servo normal). Never enable
any swash plate or rudder mixing function in the transmitter. This is handled by the
Spektrum AR7210BX.
4. Do not adjust the pitch curve at this time. During setup, the pitch curve must be linear
from 0% to 100%.
5. Again, make sure that there are no mixing functions active (for example "tail curve").

Receiver Installation

Attach the Spektrum AR7210BX receiver using one of the provided
mounting tape pieces. The Spektrum AR7210BX must be in a
low vibration position, such as the receiver or gyro platform.
The mounting platform must be perpendicular to the main shaft.
Helicopters generally have enough room on the frame to separate the
main feeder antenna from the optional remote receiver. If necessary,
make a mount using clear plastic to attach the remote receiver. Do not
place the antenna tips directly on the carbon fiber.
The Spektrum AR7210BX can be attached flat, upright or inverted under
the helicopter. The servo connector pins must always point toward the
front or rear of the helicopter. Make sure the edges of the Spektrum
AR7210BX are all parallel with the corresponding axes of the helicopter.
90°
CH2 CH3
CH1
7
Electronic Mixer
120°
CH2
CH3
CH1
EN
140°
CH2 CH3
CH1
®