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  • Nathan Douglas Lindeman October 12, 2014 at 9:25pm

    Are you using the Airspeed sensor. If yes, and it is "enabled" make sure it is reading airspeed, had this issue with my FX-79, found my airspeed sensor was not reading, and was enabled, and in every Auto mode, it thought it was stalling, so it dove to gain airspeed. Also, I just had a crash this saturday that involved "min airspeed" beign set FAR too low, my fault I know, but this created a situation where the airspeed was a bit too low, and turning from down wind to an up wind situation, the aircraft tip stalled into a irrcoverable spin dive. Out of curiousity, which airframe are you flying?

    • Ahmed Rehan > Nathan Douglas Lindeman October 16, 2014 at 2:20pm
      Jeff what is your RTL altitude?
    • Ahmed Rehan > Nathan Douglas Lindeman October 12, 2014 at 11:53pm
      I am not using airspeed sensor and it is disabled min air speed is well above stall speed. Airframe is custom cnc cut 3 part flying wing 2M span will post photos later.
      • Adam Kroll > Ahmed Rehan October 13, 2014 at 12:38am

        Its 99.99% likely that Tridges recommendations will solve your problem.

        I recently bought pixhawk and the last firmware version I used until recently was 2.67, since then a new method of elevon mixing had been introduced, which had me stumped for a day until I found this page

        http://plane.ardupilot.com/wiki/arduplane-setup/first-time-apm-setu...

        Make sure to read it carefully in particular the chapter - New style elevon mixing EEPROM setup (ELEVON_OUTPUT option)

        • Ahmed Rehan > Adam Kroll October 13, 2014 at 7:31am

          yes i already checked this and tested using elevon_output option in manual mode it is ok. i will do next flight after recalibration and will update.

          • Ahmed Rehan > Ahmed Rehan October 14, 2014 at 4:33am

            Thanks to every body specially Tridge / Gary

            Just Tested with new calibration worked perfect tuned with auto tune.  tested FBW_A and auto mode also worked perfect. The P gains were too low as default . will test auto takeoff and land and will update.

            Ahmed

            • Ahmed Rehan > Ahmed Rehan October 15, 2014 at 6:04am

              Today Auto takeoff worked perfect will try auto landing in next flight any suggestions on approach of autolanding height and distances.

              • Jeff P > Ahmed Rehan October 16, 2014 at 7:01am
                I also am having this problem that you have now corrected. I am flying a Hercules wing on 4S, twin engine. The last two flights when I enabled RTL my plane ended up in a steep dive, both times I regained control. I am using the new digital airspeed sensor. My main question is, if I was flying at less then my cruise airspeed of 17 m/s when I engaged RTL, would the plane drop altitude to gain speed. Thanks for your help JEFF
      • Moderator
        Gary Mortimer > Ahmed Rehan October 13, 2014 at 12:18am

        Ahmed, Tridge has responded, it is a setup problem please undertake the steps he has advised.

        • Ahmed Rehan > Gary Mortimer October 13, 2014 at 12:35pm

          Gary /  Tridge one thing i cant understand it flew one mission with the same setting ok navigating all waypoints and then started orbiting over head. 

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