Why choose this algorithm to calculate break angle

In the function void Copter::ModePosHold::poshold_update_brake_angle_from_velocity(int16_t &brake_angle, float velocity), there is an algorithm to calculate lean_angle:
lean_angle = -poshold.brake_gain * velocity * (1.0f+500.0f/(velocity+60.0f));
Why choose this? Is there any reason or experience? Thanks!
Sincerely

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