snoop9erdog
Well Known Member
Does the Garmin GAD 27 have trim speed control in its logic or should I plan to get the SPD-1 Speed Control from Ray Allen (if it's even needed)?
Does the Garmin GAD 27 have trim speed control in its logic or should I plan to get the SPD-1 Speed Control from Ray Allen (if it's even needed)?
Hello Ed,
When you have a G3X Touch system with a GAD 27 and autopilot servos, the GAD 27 performs the function of pilot/copilot trim switch mixing, and drives the trim inputs on the servos, but it is the servos themselves that drive the optional trim motors. You do not need a third party device to perform trim motor speed control.
Speed scheduling of the trim motor drive signals to run them slower at high airspeeds and faster at low airspeeds (e.g. in the pattern) is provided by the servos both when the autopilot is engaged and disengaged.
Let us know if you have additional questions.
Thanks,
Steve
Yes it does have a variable speed control for trim. It is set up for each trim motor. The system varies the speed based on the airspeed limits and percent of speed at each airspeed limit. Reference the 34.4.11.1 section, page 34-101 on the G3X Installation Manual Rev AD.
If you use the Garmin autopilot servos then it always auto trims my Ray Allen trim motors while engaged. It is nice to disengage the autopilot and the trim is set perfect for the current speed when disconnecting.