A Design Procedure of Stern Profile and Rudder Area for Large Full Ships in View of Course Stability

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  • 針路安定・追従性から見た大型肥大船型の船尾プロファイル形状と舵面積の決定法
  • 針路安定・追従性から見た大型肥大船型の船尾プロファイル形状と舵面積の決定法〔含 討論〕
  • シンロ アンテイ ツイジュウセイ カラ ミタ オオガタ ヒダイ センケイ ノ センビ プロファイル ケイジョウ ト カジ メンセキ ノ ケッテイホウ ガン トウロン

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Abstract

The author proposed the procedure to decide the standard rudder area required by the course stability when most of the ships adopted Inverted-G stern. After that mariner stern became popular and further these days many of the merchant ships have been built with Stern Bulb configurations. The course stability of large full ships are much affected by the difference of the stern profiles i.e. Inverted-G type, conventional Mariner type, and Stern Bulb type even if the rudder area ratios are same. The difference of the spiral loop widths due to the different stern profiles were recognized when they are plotted on the basis of the standard rudder area ratio given by the author. In addition to that, by defining the stern profile indices which is the projected skeg area ratio in stern part, the relationships between the spiral loop width and the stern profile ratio are clearly observed. The author totalized these studies and proposed a trade-off chart between the stern profile ratio and the rudder area ratio, which will give a guide to obtain the reasonably sufficient course stability in the initial design stage of maneuverability for large full ships.

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