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Loiter mode went to land state during flight, heli started a free falling

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@ZvikaF wrote:

Went today to check the 450 helicopter with pixhawk and GPS installed, in an open field.
was a pretty windy situation, but the flight was manageable, decided to try the loiter mode at an altitude of about 10 meters, the heli went into the mode,flight was not so stable but i did not expect much as the wind was pretty gusty. suddenly the heli started falling. i’ve tried adding collective command with no luck, then changed back the mode to stabilize which regained control over the collective, and i was able to stop the fall few centimetres above the ground.
Looked into the data and could not find the reason … any idea ?

following is a link to the log of this flight
https://drive.google.com/file/d/1fu65ENxii0-t4r95DgKwRAv5cj5t7xQx/view?usp=sharing

regards
Zvika

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