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Logic: Altitude hold example (GYRO based)

# Small example helicopter with a toggleable altitude hold system. #
This variant uses a GYRO for the altitude. This works very well for small to medium helicopters within a certain weight/power ratio.
More extreme builds (tiny, huge or just very powerful) can be problematic with a GYRO and would benefit from a finetuned PID.

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The helicopter uses as sticky collective controlled via W/S.
3 toggles the ALT hold, the controls are labeled.

Gates relevant to the altitude hold are colored blue.