An account is given of an experimental study with models of a twin-hulled air-cushion vehicle. The study has clarified how resistance is influenced by the cushion pressure and the interval between the two hulls, the main conclusions being:--(1) The total-resistance coefficients of a twin-hull ship, corresponding to the twin-hull A.C.V. without the cushion equipment, decrease as the interval between the two hulls increases, when Fn = 0.5 to 0.8. According to the results of wave analysis, this is caused by the change in the wave-making resistance. (2) For Fn = 0.5 to 0.8, the interval effects on the wave-making resistance can be explained by the interaction between the hulls. The interaction function FT1, introduced in this report, was proved to be a good parameter. (3) For large Froude numbers (those exceeding 0.7), the total-resistance coefficient of the twin-hull A.C.V. decreases as delta Sub c/delta Sub r increases (this is the ratio of the volume displaced by the cushion pressure to the total displacement volume). This result is mainly due to the wetted surface being small for large values of delta Sub c/delta Sub r. Order from: BSRA as No. 47,483.

  • Corporate Authors:

    Japan Association for Technical Information

    4-7-107, Yamazaki-cho, Machida City
    Tokyo 194-01,   Japan 
  • Authors:
    • Ozawa, H
    • SHIMADA, K
  • Publication Date: 1977

Media Info

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Filing Info

  • Accession Number: 00170893
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Mar 14 1978 12:00AM