9. Some Model Experiments and Ship Correlation in Respect to Manoeuvrability

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The present paper relates to some model experiments and ship correlation in respect to manoeuvrability, carried out at the Osaka University Tank under co-operation of Kawasaki Dockyard Co. and Sasebo Heavy Industries Co. The standard zig-zag tests were carried out for a 13,000 DW cargo liner and her model at various load conditions, while the similar tests as well as turning and spiral tests were done for a 130,000 DW super tanker and her model at full load condition. The correlative studies shows that model ships are much more stable on course, much quicker in response to helm and have less turning ability for slight helm, compared with actual ships. The difference between models and ships, however, decrease with increase of the intensity of turning motion so that there is no significant discrepancy between the two in respect to turning diameter for hardover helm. In a word, there is a considerable model-ship disagreement upon stability on course, but not upon turning performance at hardover. It should seem that this discrepancy relates largely to difference in propeller race intensity through rudder effectiveness and possibly propeller fin effect. The difference results largely from the lack of friction correction for free-running models.
社団法人日本船舶海洋工学会の論文