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.
The Dutch coaster Mv. Stroombank is leaving the port of Figueira da Foz in Portugal. Normally operations are restricted to daylight only, but because bad weather was forecasted for the days to come we've received an exemption and were allowed to depart during dark hours. Cargo operations were running close to the departure deadline so we quickly secured the cargo and prepared the vessel for sea. The tide was running out so we used the forward spring to keep position as we went slow astern...
