ISO 13643-2:2013 pdf free

ISO 13643-2:2013 pdf free.Ships and marine technology一Manoeuvring of ships一Turning and yaw checking
In addition to the general test conditions outlined in ISO 13643-1 and Clause 5, the following conditions shall be complied with:
一The ship shall be at a steady speed Vo before commencing the test. During the test, the propulsion plant settings must remain unaltered.
一During the approach, the ship is going straight ahead at a steady speed without significant application of a manoeuvring device for at least two minutes. For ships unstable in yaw, realistic minimum manoeuvring device angles should be used during the approach. It is important that during the approach, the ship has as little yaw velocity as possible. To start the test, the manoeuvring devices are applied as required by the specific test as fast as possible in the required direction of the turn and are maintained at that setting during the rest of the test (beginning of the application at t= 0). Following a transient phase, the turn will become steady, i. e. the rate of turn, ship’s speed, heel, and drift angle will then all be constant. The steady turn may be disturbed by external influences.
一Applying the manoeuvring devices equally to port (P) or starboard (S) may result in differing responses of the vessels (e. g. dissimilar turning diameters). Consequently, the direction of turn for which the data were measured must be recorded. The conduct of port and starboard turning circles using the same settings of the manoeuvring devices should be attempted consecutively from the same initial heading, preferably into wind.
一The test is completed after a change of heading of at least 360°.
In addition to the general test conditions outlined in ISO 13643-1 and Clause 5, the following conditions shall be complied with:
一The ship starts from zero speed with the propulsion plant set at half ahead. From then on, the propulsion plant settings must remain unaltered. Simultaneously, the manoeuvring devices are applied hard over in the specified direction as fast as possible. The manoeuvring devices are kept in this position until the test is completed. Acceleration and manoeuvring devices actuation to commence at t= 0.ISO 13643-2 pdf download.