Shiphandling for the Mariner, 4ª Edição, pg.18-19eu não consegui encontrar essa afirmação no livro
muito obrigado
A vessel can have positive, negative, or neutral directional stability. A ship that tends to steady up when the rudder is put amidships has positive directional stability. If she swings at increasing rates of turn when the rudder is amidships she has negative stability. A vessel with neutral directional stability continues swinging at the present rate, or continues along on her current heading until external forces take charge. She has no tendency to either increase or decrease her rate of swing when the rudder is left amidships.