My question is, “How can I avoid a repeat?”

Log attached.

DVR review:  While in loiter mode (116 ft altitude, 58% throttle), my quad went into RTL (116 ft, 58% throttle). I clicked into loiter. The throttle instantly reset to zero (111 ft). The quad fell like a rock. I pushed the throttle up (throttle 100%, 81 feet) but the quad continued to drop and roll. It hit the ground & immediately started climbing again (still in loiter mode, throttle still 100%). Then, it automatically changed to land mode (11 ft, 100% throttle), but kept climbing and was uncontrollable (throttle changed to 85%, then to 56% which was about where it was at when it went into RTL). The throttle then changed to 95% (I could have done this), then it automatically reset to 50% and stayed in land mode). It then crashed into a wall.  

2015-04-18 08-55-42.log

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Replies

  • To avoid that, the best reflexe is to put your machine in stabilized mode and full throttle. All other modes are using sensors (like gps) that can send wrong info.

    • Thank for the reply, Max. That makes sense. I will preplan that protocol for the next exciting moment. The problem is the instant zero throttle setting. I need to find out what caused that and what will prevent it. It will take me several weeks to rebuild my quad, but I don't want to fly it until I can trust the Pixhawk again. I had this problem with the old 2.6. I thought it was fixed.

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