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Tactical diameter

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The tactical diameter of a ship is the distance:

  • travelled on sea surface
  • during a turning circle test
  • with maximum rudder angle
  • by the center of gravity of a ship
  • taken perpendicular to the initial track followed at approach speed
  • when the heading has changed by 180°

The ratio of the tactical diameter divided by the ship's length between perpendiculars gives a dimensionless parameter which can be used to compare ships maneuverability.

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