The QuikTune script stopped, or would not start

What ArduPilot says:

• Tuning: attitude error N.Ndeg - ABORTING
• Quicktune unknown vehicle
• Tuning: reverted
• Tuning: Must be flying to tune

“Tuning: Must be flying to tune”: the switch is in the tune position but the aircraft is disarmed or not yet flying (repeated every 5 s). “Tuning: reverted”: the switch went low, or the aircraft landed or disarmed, before the tune was saved; the gains from before are back. “attitude error … ABORTING”: the aircraft was more than QUIK_ANGLE_MAX (10° by default) away from the attitude asked of it, so the old gains were put back at once. “Quicktune unknown vehicle”: the script found neither Copter's nor QuadPlane's parameters. The first two are sent at the highest severity; they are not emergencies.

What to do, most likely first

1. “attitude error”: a gain rose into a real oscillation before the script caught it, or a gust or a stick movement tilted the aircraft.

   FixMove the switch low to reset, then fly the tune again in calm air with the sticks left alone. A higher QUIK_DOUBLE_TIME tunes more slowly and a lower QUIK_OSC_SMAX stops each gain earlier.

2. “reverted” when you meant to keep the tune: the switch went low, or you landed, before saving.

   FixAfter “Tuning: DONE” move the switch high and wait for “Tuning: saved”; with a two-position switch set bit 0 of QUIK_OPTIONS and QUIK_AUTO_SAVE to a few seconds.

3. “Must be flying”: the switch was left in the tune position on the ground.

   FixSwitch low, take off and hover, then move the switch to the middle.

Parameters to look at

Where to do it:Setup & Tuning GuideSetup & Tuning GuideLua Applet Catalog