Water Tank Experiment on the Twist Motion of Pilot Ladder Due to Collision of Wave Crest

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  • 波頭の衝突によるパイロットラダーの反転に関する水槽実験
  • ナミガシラ ノ ショウトツ ニヨル パイロット ラダー ノ ハンテン ニ カン

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This paper demonstrates the danger of a pilot on the pilot ladder whose steps are swept away by a big wave crest, through the water tank experiment using a 1/10 partial scale model. This scale was decided to avoid the scale effect in model experiment such as the surface tension of water and to obtain the geometric similarity and the mechanism of a combination ladder system. From the experiments we obtained following results. (1) A human body model on the pilot ladder twisted over 90°. (2) The above dangerous condition happened more easily when the human body stood on a low position of the pilot ladder and one or more ladder steps were submerged.

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