We have a large 12kg multirotor (AUW) that flies 5m/s on auto missions as the default Mission Planner setting.
We can set WPNAV_SPEED higher according to the docs: http://ardupilot.org/copter/docs/auto-mode.html
The maximum wind speed the multirotor can fly in is 11m/s and the maximum speed of the multirotor is 20m/s.
I found a reference in the arducopter github release logs indicating that there was a bug fix (in around 3.2.1) that will "not allow the WPNAV_SPEED to exceed the aircraft capabilities" If a too fast a speed is entered for the mission, the multirotor will fly as fast as it can but STILL maintain height.
I also spoke to the manufacturer and they indicated that "retuning" would be necessary to optimize the endurance of automissions if a higher speed was chosen. What would he have meant by this, and is it really necessary? I am thinking 10m/s may be possible for our missions.
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