Several model tests are outlined for evaluating the manoeuvrability and directional stability of full and large ships. The tests are classified into three groups according to the amount of helm involved. The modified zigzag test and the reversed spiral test using the oscillation method are described in detail. Problems of correlating model and full-scale behaviour are discussed.
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References
1.
Proc. 2nd Symp. Ship Manoeuvrability1970 (Society of Naval Architects of Japan).
2.
MotoraS.FujinoM. ‘On the modified zig-zag manoeuvre to obtain the course-keeping qualities of less stable ships’, contribution in 12th I. T. T. C., 1969.
