The recently established 200 nautical-mile limit of the EEZ and the demand for less fuel consumption and better seakeeping, makes the small fast displacement warship more attractive than planing craft. In order to develop a low-resistance hull, several model series with varying parameters were designed and towed in China and elsewhere. After an analysis of the test results from available sources, the influence of the various parameters on calm-water resistance is discussed and the recommended values for the principal parameters versus Froude numbers are presented. The Authors found that four of the parameters, namely length-displacement ratio, longitudinal distribution of displacement, prismatic coefficient, and ratio of transverse section area at transom, are of greater importance than L/B, B/T, half angle of entrance, etc. It is felt that this tentative conclusion might be helpful to designers of high-speed craft and in the selection of parameters for new model series. Some 87 round-bottom type ship models have been analysed by a regression method to derive a correlation equation and in addition the wetted-surface co-efficients of 122 round-bilge craft have been analysed to derive a predicting equation by the same method. Both equations may be used to estimate the resistance of fast round-bilge craft within the range of Froude numbers F sub a = 0.4 to 1.0. Order from BSRA as No. 54,541.

  • Authors:
    • Ping-Zhong, J
    • Ba-Ying, S
    • Zhong-Kai, T
  • Publication Date: 1980-9

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Filing Info

  • Accession Number: 00329898
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Mar 12 1981 12:00AM