Rotor Head Gains; Tail Rotor Gains - Innoflight GALAXY 950 Operating Manual

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Rotor head Gains

There are two main settings for the rotor head control Cyclic Gain and Attitude/GPS Gain.
Settings for the Cyclic Gain should be adjusted in 2% increments only and stay in a range of
85% - 130%. The default Galaxy Cyclic gain is 90% (+/- 5%) when tuned to a 5kg payload.
Settings for the attitude/GPS are always set to 100%, as with cyclic gain adjustments these
should only be altered at 2% increments. It would be exceptionally rare that these values
ever exceeded 100%. The attitude/gps gain value alters the reaction the autopilot takes to
hold a GPS location therefore lowering the value creates a more stable flight as the Galaxy
will react slower to holder precise positions.

Tail Rotor Gains

The Galaxy features a unique direct drive fixed pitch tail rotor control system. Unlike a
traditional variable pitch tail the Galaxy tail position is held by adjusting the RPM output of
the individual tail rotor motor. This allows far fewer mechanical parts and lower
maintenance requirements.
Tuning the tail:
The tail control gains consist of two values "Rudder Lock Gain" and "Rudder I Gain". The
default values for the Galaxy is 135% (+/- 5%) for the lock gain and 40% (+/- 5%) for the I
gain. There are situations where these settings may need to be adjusted to meet the user
requirements or environmental conditions such as wind. The tail rotor control is very
forgiving to adjustments compared to the rotor head, increments of up to 10% per change
can be made to the "Lock gain" and up to 7% adjustments of the "I" Gain.
Lock Gain: The Rudder Lock Gain values adjust how much power the Galaxy will use to
maintain the heading, the higher the value the harder it will try to hold a perfect heading.
However, if the value is too high then a hunting/bouncing effect may be observed where the
tail is too sensitive to the heading. Lowing the Lock Gain will decrease the heading
sensitively and allow a softer medium for the heading control to be maintained. Often this
value is sensitive the wind, typically higher wind the higher this value needs to be to
counteract the wind gusts.
Rudder I Gain: The I gain adjusts the amount of power the autopilot applies to the tail rotor
to react to the Lock gain. For example, a low lock gain and low I gain would result in a weak
heading hold as the tail would have low sensitivity and power to heading control.
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INNOFLIGHT INTERNATIONAL GALAXY 950 / GALAXY 1080HL MANUAL