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Apr 06, 2014, 11:13 PM
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open loop autopilot 2

Syma X3 Open loop autopilot (1 min 5 sec)

Open loop autopilot is how all the commercial quads do flips. It's how the early academic quads did aerobatics. They just repeatedly flew a fixed set of stick inputs & delays until the maneuver came out. There might be room for some tweeking to try to keep it inside a box, but the maneuver is flown without any position knowledge. The Vicon system might have improved enough that open loop flying is no longer necessary in academia.

The next step is merging the altitude reading with open loop commands so the altitude changes can be faster. Ideally, it would take off & get into a stable hover before beginning the maneuver, but that would require XY sensing.
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