Could you explain what is a turtle mode?
I'm wondering what the use of it is? Does it work on all quadcopters?
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Turtle Mode, Flip Over After Crash in Betaflight, is a mode that allows your drone to flip over if it is upside down by reversing the prop direction and spinning up very rapidly in order to lift a side of the drone so it flips to the upright position.
This is a manual process - the drone doesn't do this automatically when it flips over (you need to enable turtle mode after the crash, manipulate the sticks to flip the drone over, and disable turtle mode in order to resume flight). It's beneficial because if your drone goes down 100' away, for example, you can put your drone in turtle mode and flip it back to the normal position, and resume flying.
There are some cases where turtle mode won't work, like when you land upside down in tall grass, the grass could bind the motors/props, preventing turtle mode from working effectively.