被曳船の進路安定

概要

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The course stability of towed boats is discussed theoretically and numerically by the parameters-a ship's course stability criterion, towing point, length of towing rope, number of boats, steering, and size of boats. The results are as fallows: (a) the course stability of same size towed boats is the most poor when the parameters of each boat are same except size of boats. (b) the more number of towing boats are, the more poor the course stability is and the stable towing of a boat is possible by the adaptation of a proper towing point and the length of a towing rope but, perhaps, it is impossible in the case of 2, 3 and more boats without steering. (c) the course stability of a towed boat increases together with the increasement of course stability criterion, but its effect is small in the case of 2 and more boats. (d) the effect of aft towing points is nearly zero, but the approach to a boat's centre of gravity is good. On the case of fore towing points it is better to part from a boat's centre of gravity except one towed boat. (e) generally in the practical case the long length of towing rope is more stable and the short length is unstable. (f) by steering the course stability increases remarkablly and of course the steering of each boat is very good, but the steering of only a last boat is not questionable in the case of 2 towed boats and the use of long rope is needed in 3 towed boats.
社団法人日本船舶海洋工学会の論文
1971-07-31