In arduplane 4.5.4RTL mode, the altitude will drop when the speed is slow. The speed before the crash was about 20m/s, and after the crash it was about 15m/s. If you fly slowly, the altitude will drop. After calibrating the compass, the aircraft will not lose altitude, but the speed will not increase. There is no airspeed meter installed. Please help, thank you
If you want help you have to describe first your problem with all necessary technical information in an understandable form.
- describe your setup
- desribe what happens
- describe what espected
and provide the log files
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