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The Ever Act, the worlds largest and the second to be built out of a series of 12 record breaking vessels prepares to depart Felixstowe Berth 9 with a maximum draught of 10.2 metres for her next port of Hamburg. As the DFDS ferry was heading inbound at the North Shipwash, Harwich VTS had asked then to make best speed so they planned to get the Suecia Seaways through before the Ever Act broke away. A Harwich Haven Pilot Launch heads over from Harwich with a pilot for the Ever Act....
This video shows an introduction on the Spiral-Test-Manoeuvre and describes the procedure how to steer through this manoeuvre and measure the data needed. The results will be displayed in a characteristic diagram allowing to identify stable and unstable conditions and related, detailed information, e.g. spiral loop width and height, rudder angle of neutral effect. Samples of stable and unstable ship behaviour demonstrations will be shown by Fast Time Simulation using the SAMMON Planning tool.