Responder a: Manobra Definitiva – Espiral

[fabio]

Fabio,

Na mesma página, logo adiante fica mais claro:

“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.”