Abstract
Recently, many kinds of energy saving ships have been studied because of the increasing price of fuel oil. The authors have been considering the computer control of hybrid power driven ship since 1973's oil shock. As the first step of studies on the operation of hybrid power driven ship, they analyzed the log book of sail training ship KAIWO MARU, and tried to establish a method of selecting the optimum route of sailing ship. Relations between relative wind directions and ship's speeds were investigated and performance curves were obtained for each beaufort scale. Using those performance curves, the simulations of minimum time routes were executed and one route was compared with actual route taken by KAIWO MARU. Furthermore, the effects of wind fields in the North Pacific Ocean to the optimum routes were considered. From these studies, they could show a method to operate a sailing ship effectively using statistical performance curves and the information of wind fields.
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