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...
Research on hydrodynamic interaction indicates that if the speed of the ship near a bank is too high, the rudder may be less able to cope with the forces induced and control will be lost. The Nautical Institute highlights this in its latest Mars Report, in which an LPG carrier hit a barge being towed by a tugboat as a result of hydrodynamic forces.
