Operating instructions

2. Adjust the mechanical linkage: lengthen or shorten the pushrod between the servo and the swashplate until the swashplate is straight.

Adjusting the main rotor blades (blade tracking):

The purpose of this adjustment is to avoid imbalance in the main rotor blades, and to set the blade tracking accurately.

Self-adhesive marker stripes

Two self-adhesive stripes of different colour are applied to the rotor blades in order to simplify the adjustment of blade tracking. When

the main rotor is spinning, you can check which blade has to be adjusted by observing the coloured stripes, i.e. the blade to which an

adjustment needs to be made.

Checking blade tracking:

Please note: to avoid accidents it is important to place the model at least three me-

tres from you when checking blade tracking. Slowly advance the throttle (don't allow

the model to take off), and observe the rotor plane from the side. If the outside edges

of both rotor blades are exactly in line when the rotor is spinning, the blade tracking is

correct. However, if you can detect two lines, you must correct the blade tracking by

adjusting the pushrods at the blade grips.

Adjusting blade tracking

The following section describes the main causes for incorrect blade tracking:

1. The blades are of different weight.

Remedy: remove the adhesive tape from the heavier blade, or apply more tape to

the lighter blade to increase its weight.

2. The Centre of Gravity of the blades is not identical.

3. The length of the rotor blade pushrods is not identical.

4. The blades are not secured ﬁrmly enough, allowing the blade grips to distort.

Adjusting the tail rotor linkage:

This step is only necessary if you replace the tail rotor servo.

Incorrect blade tracking

Correct blade tracking

Operating Instructions - BLUE ARROW CP120 S-FHSS RTB 2.4 GHz No. S2540

Pushrods

Main rotor blades