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Sudden uncontrolled roll at full speed and crash striaght into an iron fence. Run into lipo fire and luckily no other electronics damaged. Still cannot find the reason for the uncontrolled roll. Likely one of the servo extension wire get loose, or may be the BEC lockdown due to overheat(which is very unlikely)
Lesson to learn- solder any extension instead of lazy plugs.
She flies fast, especially after upgraded to 4s 2200 lipo.
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