7
RECEIVER AND SERVOS
Mount the TR421 4-Channel Rx Control Board as specifi ed in the model’s
instructions. The built-in receiver is compatible with Tactic brand 2.4GHz transmitters
only. Make sure the airplane’s control pushrods can easily reach the arms of the
actuators, and are completely unobstructed.
To connect the airplane’s control
pushrods to the servo levers, fi rst center
the trims on the transmitter. Make sure
the servo’s arm is moved to a position
that will allow for full control of the
airplane’s surface in both directions once
the control rods are connected. This can
be tested by moving the Tx sticks to
maximum positions several times while
observing the movement of the control
surfaces. If a servo is binding or sticks in fl ight, the pushrod must be re-adjusted so
as not to drain excessive current from the battery and thus shorten fl ight time.
EXTERNAL SERVO CONNECTION
A socket is provided on the Rx Control Board for the addition of a separate servo (see
picture on page 6). If the Tx is confi gured for 4ch operation, connecting a linear actuator
servo to this socket will allow for control of an airplane’s aileron surface (as well as
elevator, rudder, and throttle). See your local retailer for Tactic’s TSX21 Linear Actuator
Servo (TACM0021), which connects directly to this slot.
BRUSHED ELECTRONIC SPEED CONTROL (ESC)
The integrated 3 amp ESC is designed for micro-size brushed motors only. Connect the
Rx Control Board’s two brushed motor leads to the brushed motor. To set up the ESC:
1. Turn on the TTX402 transmitter.
IMPORTANT! Always make sure that power is applied to the transmitter
BEFORE applying power to the receiver and servos, and that the
throttle stick is at minimum (idle) position. Failure to do so could result
in the model becoming uncontrollable and cause a safety hazard.
2. Move the Tx throttle stick to the minimum position.
3. Set the Tx throttle trim to center.
4. Connect the battery to the Rx Control Board. Power will be confi rmed by the Rx
Control Board sounding one beep.
5. Arm the ESC by moving the throttle stick to full throttle, which will be accompanied
by a single tone. Return the stick to the minimum position, which will be
accompanied by two tones.
6. The ESC is now armed and ready for operation.
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