Abstract
When estimating a magnitude of tug power to assist a berth manoeuvre of VLCC, we have to know a transverse water force exerted by lateral motion of ship and a side wind force. For this purpose, author first conducted the model experiment for a transverse water resistance in the shallow water at a very smooth speed, secondly carried out actual VLCC tests for berth clear manoeuvring at six oil terminals in order to check a reasonable value of the transverse water force coefficient C_<wy> at half loaded condition and ballasted conditions, and finally submitted a proposal about the reasonable value of C_<wy> and a standard value of wind speed, current speed, and jetty approach speed for determining the tug power in the course of an ordinary berthing.
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