Operating instructions

Move the throttle stick and trim to their lowest position, and move the tail rotor stick to the neutral position. When you have installed the
new tail rotor servo, check that the tail slider sleeve is central on the tail rotor shaft, and that the servo output arm is at 90° to the servo
case and the tail rotor pushrod. If everything is as stated, it is safe to fly the model. However, if there is a problem, switch the helicopter
off and then on again. When initialisation is complete, the tail rotor servo will again be at the neutral position. Fit the servo output arm at
an angle of 90° to the servo, then lengthen or shorten the tail rotor pushrod until the tail rotor slider sleeve is central on the tail rotor shaft.
Setting the flight mode (ADJ – WK switch):
Note: mount the receiver lying flat in the model, at right-angles to the main rotor shaft.
1. Adjustment mode (ADJ):
First bind your transmitter to the model, then move the flight mode switch on the receiver (switch 2) to the ADJ position. The receiver
and helicopter are now in set-up mode. The purpose of this mode is to adjust the servo output arms and the swashplate linkages. When
adjustments are complete, be sure to move the switch back to WK, as it is not possible to fly the model in ADJ mode.
2. Stabilised flying:
Return the flight mode switch on the receiver (switch 2) to the WK position. In this mode the two swashplate servos of a flybarless he-
licopter are stabilised in addition to the tail rotor. First set the travel adjuster (potentiometer) for pitch-axis and roll (ELEV / AILE EXT.)
and the gyro gain adjuster for pitch-axis and roll (ELEV AILE G.) to 50%, and then adjust the two pots to suit your personal preference
during a series of test-flights. Increase gyro gain until the model jitters slightly around the pitch and roll axes, then reduce the gain slowly
until the jittering ceases again. Increasing the servo travels makes the model more agile; reducing servo travel makes the model less
responsive.
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Operating Instructions - BLUE ARROW CP120 S-FHSS RTB 2.4 GHz No. S2540