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Maneuverability expresses the movements of the ship in a horizontal plane under calm water conditions.
The maneuverability data is used for the design of the control surfaces, mainly the rudder. Variations of the control surfaces affect the course stability, the ability to run away in certain emergency situations, turning ability, turning radius for some kinds of fishing operations, the necessary stopping distance.

Although during the design of the ship some estimations of the maneuverability can be done, only the model tests are able to predict reliably the behavior of the ship during a maneuver.

The following two model test techniques are used:

Free-running model maneuvering
A model of the ship, fitted out with the necessary instrumentation, is tested in inshore waters. The model is guided by a remote control and is self-propelled and controlled. CEHIPAR uses the Valmayor reservoir, not far from Madrid, which has sufficient water surface and depth for maneuvering without danger of collision.

Ensayo de maniobrabilidad en pantano con modelo libre

Pantalla de resultados de un ensayo de maniobrabilidad en pantano

Captive model maneuvering
The model with its instrumentation is fixed through dynamometers to the computerized planar motion carriage (CPMC) of the Ship Dynamics Laboratory.

Vista del interior del canal de olas

The free-running model tests mainly consist of:

  • Turning circles.
  • Pull-out.
  • Zig-zag maneuver.
  • Spiral.
  • Crash stop.
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