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If the airplane is flying smoothly and holding an altitude, the thing to do is to increase ALT GAIN slowly until the correct altitude is held. After that you may need to increase VSI gain if it overshoots the target alt after a climb or descent.
Increasing ALT GAIN will also cause the AP to hold the desired vertical speed until nearer to the target altitude, and not round out so soon.
Here are the complete tuning instructions for your convenience:

 

TORQUE:
Adjust until servo does not slip during normal AP flight, and be comfortably overridden by the pilot.

 

SENSITIVITY:
ADJUST TORQUE FIRST
Increase gradually until airplane "twitches" when on altitude, then reduce by one
or two. If servo slips, increase torque.

 

PITCH GAIN:
ADJUST SENSITIVITY FIRST
After sensitivity is set, increase gradually if airplane does not settle on altitude.

 

Altitude Gain:
ADJUST SENSITIVITY FIRST
Increase gradually if airplane levels off too soon.
Reduce gradually if airplane overshoots altitudes after climbs or descents.

 

Pull Rate:
ADJUST SENSITIVITY FIRST
Controls the rate the AP will pull when changing vertical speed.

 

VSI GAIN:
ADJUST SENSITIVTY FIRST
ADJUST ALTITUDE GAIN FIRST
Increase gradually if overshooting climbs, decrease if rounding out too early.

 

G_error_gain:
ADJUST SENSITIVITY FIRST
Increase if bumps are not smoothed enough; Decrease if ride is too harsh.

 

G_err_limit:
ADJUST SENSITIVITY FIRST
Controls the max G the autopilot will push or pull to correct a bump (up to the G limiter).

--
Mike Huff
Dynon Technical Support

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"If the airplane is flying smoothly and holding an altitude, the thing to do is to increase ALT GAIN slowly until the correct altitude is held."    What does this mean?

 

Also, if the AP holds altitude as it should, what's the point of altering settings?

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