Home 2022 Fóruns PNA – Controlabilidade Manobra Definitiva – Espiral Responder a: Manobra Definitiva – Espiral



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“spiral maneuver are the steady yawing rates as a function of rudder angle. A plot of these values is indicative of the stability characteristics of a ship. For example, if the plot is a single line going from starboard rudder to port and back again, as shown for ship A in Fig. 13, the ship possesses controls-fixed, straight-line stability; that is, it has a negative directional stability index. If, however, the plot consists off two branches joined together to form a “hysteresis” loop, as shown in ship B of Fig. 13, the ship is unstable; that is, it has a positive stability index.”