ウイリアムソンターンにおける操縦性の影響

抄録

When a person falls overboard at sea, the ship has to return to the scene to help the person. But it is quite hard to steer a ship back to a particular spot in the water, so some manoeuvers that make this easier are proposed.
The Williamson turn is one of them. It was named for John Williamson who used it in 1942. This turn is most appropriate at night or in poor visibility, because the ship gets onto a reciprocal course when you take the proposed procedure. However, hull forms and the performance of rudders have changed greatly from when this turn was first proposed. Recent ships find it difficult to effectively use the original procedure.
This paper, examines how manoeuvering factors influence the ships track using the training ship and a ship handling simulator.