On the Estimation of Stopping Ability and Critical Range of Stopping Maneuver without Tug Assistance under Windy Condition

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  • 風力下における停止性能の推定と自力着桟操船の限界について
  • 風力下における停止性能の推定と自力着桟操船の限界について〔含 質疑応答〕
  • フウリョク カ ニ オケル テイシ セイノウ ノ スイテイ ト ジリキ チャクサン ソウセン ノ ゲンカイ ニ ツイテ ガン シツギ オウトウ

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The effect of wind increases remarkably during the ship-handling at slow speed (e.g. docking and anchoring). For ship-handlers, it is important to know the stopping motion of a ship under windy condition and the ranges of wind direction and force under which tug assistance is necessary. Based on the results of a simulation study to investigate the effect of wind on stopping motion by a single-CPP and single-rudder ship, a method is proposed to estimate the critical range of stopping maneuver without tug assistance and effective stopping maneuver for docking and anchoring under windy condition. Under beam or quarter wind conditions, ships with large lateral area above waterline such as PCCs and ships in the ballast condition are forced to drift leeward greatly. Therefore it is recommended to set the approaching course toward the berth into the wind or before the wind. If wind direction changes to the opposite side during a stopping maneuver in the tail wind, the ship turns her head windward significantly. The size of this turning movement, however, can be sufficiently reduced by applying a little higher propeller reversing than the normal stopping maneuver.

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