The well-known liability for ships running in a following sea to behave in a disconcerting manner under certain conditions is discussed. A few examples of marginal behaviour leading to broaching from first-hand accounts are given in an Appendix. The changed or additional disturbing forces acting on a ship in a following sea as well as those relating to calm water conditions are listed. A brief discussion is given on the criteria and indices as related to the qualities of directional stability and manoeuverability such as are used to define these qualities numerically. Some ideas on the use of auto pilots in such conditions are put forward. While running self-propelled models in following waves it became obvious that the surging velocities reached were of such magnitude as to influence behaviour to a marked extent. Further experiments were therefore carried out with the object of obtaining quantitative data. The results set out reveal velocity increments above the still water speed over a wide range of wavelengths to an extent not previously realized.

  • Availability:
  • Corporate Authors:

    Royal Institution of Naval Architects, England

    10 Upper Belgrave Street
    London SW1X 8BQ,   England 
  • Authors:
    • DuCane, P
    • Goodrich, G J
  • Publication Date: 1961

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Filing Info

  • Accession Number: 00323568
  • Record Type: Publication
  • Source Agency: Stevens Institute of Technology
  • Files: TRIS
  • Created Date: Mar 12 1981 12:00AM