Volume 4, Issue 4, December 2019, Pages: 54-58
Received: Jul. 31, 2019;
Accepted: Aug. 29, 2019;
Published: Dec. 18, 2019
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Victor Dubrovsky, Balt Techno Prom Ltd, St. Petersburg, Russian Federation
More or less researched types of multi-hull ships and their specificities: the general view. The main conformity of the ship types and theirs technical and exploitation characteristics. Twin-hulls as most wide- spread types of multi-hulls, especially as high-speed passenger ones. Ship performance as the most important characteristic of fast enough ships. The main dimensions and general characteristics of 25 built twin-hull ships with small water-plane area and 15 built high-speed catamarans. (It is not so big volume for statistics, but even it allows showing of some useful characteristics of these ships.) Some important characteristics of these ships were examined: so named “admiral coefficient; relative speed (Froude number by a hull length); relative length of a hull; relative draft”. Calculated relative characteristics show, firstly, evident growth of admiral coefficient of SWATHs with Froude number increasing. Surprisingly, the examined high-speed catamarans have slightly lower admiral coefficient at corresponded Froude numbers, most possible because of smaller immersion of the main volume of hulls and smaller draft, which defines smaller diameter of propulsors. Relative length and relative draft of SWATHs show moderate growth for bigger Froude numbers, but the dispersions are big enough and the usable numbers of these characteristics are not defined more or less exactly. But the better (from propulsion point of view) shown ships can be applied for approximate estimation of the same characteristic of newly designed ships.
Some Notes on Statistics of SWATHs and Catamarans, Engineering Science.
Vol. 4, No. 4,
2019, pp. 54-58.
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