The Small Waterplane Area Twin Hull (SWATH) ship shows great promise for naval and civil applications. However, high-speed manoeuvring is a problem because of the directional stability imparted by the wallsided hulls, and to find a solution to this the DTNSRDC has carried out a series of rotating-arm experiments, on a SWATH 6A model, in which three types of rudders were evaluated. These were a strut rudder (a movable section of the strut), a spade rudder (a surface-piercing rudder aft of the strut) and a retractable forward foil beneath the hull (this "rudder" develops a force through its fixed angle of attack and the camber of its section). The Authors discuss the experimental techniques used (an explanation for not using the planar-motion mechanism is included), give an account of the tests, and present and discuss the results. It was concluded that the rotating-arm technique can be successfully used for this type of investigation; the results indicate that the spade rudder has comparatively good performance under various operating conditions.

  • Corporate Authors:

    Kalerghi Publications

    51 Welbeck Street
    London W1,   England 
  • Authors:
    • Waters, R T
    • Fein, J A
  • Publication Date: 1978-1

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00178318
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Jul 19 1978 12:00AM