Align T-REX 450SA ARF Manual page 44

If you find that both rotor blades are not positioned at exactly 0° of pitch, are certain that you have
assembled and adjusted all linkages to the recommended lengths and have the servos in their
neutral position, we suggest adjusting the lengths of the servo-to-swashplate (D, E, F) linkages. You
will need to shorten the length of all three servo-to-swashplate linkages by an equal amount if the
rotor blades are set to positive pitch, and vice-versa if the rotor blades are set to negative pitch. Make
small adjustments to the length of all three linkages in equal amounts until the rotor blades are
positioned at exactly 0° of pitch.
Note: If you are using E-flite/Spektrum S75 servos, you will need to shorten the lengths
of the servo-to-swashplate linkages in order to achieve exactly 0° of pitch for the main
rotor blades. Again, you must shorten the length of all three linkages by an equal
amount, and the amount of adjustment required will vary slightly depending on the
actual neutral position of the servo arms (which can be between approximately 5° and
10° upward).
13.5 After confirming that the main rotor blades are set to 0° of pitch with the throttle/collective stick in
exactly the center position (in Normal Mode), move the throttle/collective stick to full. Now, check
the position of the main rotor blades in relation to the flybar when viewing the model from the side.
They should be set to approximately +9° to +11°. If they are not, adjust the Normal Mode High pitch
curve value (PHN) in order to adjust the rotor blade position at full throttle/collective when in the
Normal Mode only (preferred). Or, adjust the Pitch CCPM travel value (CP6) in order to adjust the
rotor blade position at low and full throttle/collective positions in all flight modes (only required if
you need to adjust the Normal Mode High/PHN value beyond approximately 90% or 100% travel in
either direction to obtain the correct amount of pitch).
Typically, we find that approximately +10° of pitch is a very good starting point for most pilots.
13.6 Still in the Normal Mode, move the throttle/collective stick to its lowest position and check the
position of the main rotor blades. They should be set to approximately -2° to 0°. If they are not, adjust
the Normal Mode Low pitch curve value (PLN) accordingly. Increase the value to reduce the amount
of negative pitch, or decrease the value to increase the amount of negative pitch. Do not adjust the
Pitch CCPM travel value (CP6) in this case.
13.7 After confirming that the main rotor blade pitch values are correct in the Normal Flight Mode,
you will also need to confirm that they are correct in the Idle Up/Stunt (3D) Flight Mode. However,
because you have already checked and properly adjusted the main rotor blade pitch at mid and high
throttle/collective stick positions in the Normal Mode, and because the same pitch curve values are
used in the Idle Up/Stunt flight mode, no additional adjustment should be necessary.
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