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AN INVESTIGATION OF HYDROFOIL VESSEL MANEUVERABILITY UNDER RESISTANCE HUMP CONDITIONS

An experimental study of the maneuverability of a series of sharp-bilged cutter models was made; the models are based on underwater foils with systematically variable draft, length, and center of gravity. The experiments were conducted from Nov 1964 to Jan 1965 in the experimental tank of the Department of Hydromechanics of the Chalmers School in Gothenburg, Sweden, under the scientific direction of Prof. K. Falkemo. Five models were utilized having the same bow shape, but differing in the length of the prismatic hull part (outlines of all models match the same theoretical drawing). As the result of varying the length from 5.55--1.45 m and the load from 100--40 kg, a change in relative aspect ratio from 3.6--14.2 occurred (usual value taken to be 8), and the center of gravity was displaced from 12--20 percent in the hull with respect to midlength on the water line. The experiments were conducted in a gravitation basin with an effective water length of 95 m and width of 15--30 m; the least distance to the bottom and sides of the basin along the section where measurements were made was 5 m. Resistance and speed were automatically recorded on tape. Model speed was set between 2 and 8.5 m/sec. The experimental results produced the following conclusions: 1) the qualitative and quantitative effect of the change in characteristics on resistance of the hull planing on hydrofoils was determined; 2) formulas were derived for determining, in the initial planning stages, the relative aspect ratio l and the position of the center of gravity x; 3) a method is given for determining specific resistance for the hull of the hydrofoil vessel with sharp bilge lines by an approximate formula and for plotting the resistance curve for the vessel over its whole range of speeds; 4) it is shown to be possible to determine the optimum combination of hull and hydrofoil system to provide reliable vessel starting and a high hydromechanical characteristic at rated speed; this method may be used to calculate the path length and time for hydrofoil vessel takeoff.

  • Corporate Authors:

    Trudy Leningrad Korablestroitelnyy Instituta

    Leningrad,   USSR 
  • Authors:
    • Tsarev, B A
  • Publication Date: 1966

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Filing Info

  • Accession Number: 00014978
  • Record Type: Publication
  • Source Agency: Joint Publications Research Service
  • Files: TRIS
  • Created Date: May 7 1973 12:00AM