ON THE ROLLING MOTION INSTABILITY INDUCED BY SAIL ACTION

Generally the sail is considered a stabilizing device able to damp rolling motion. However, with some combination of course sailed, wind speed, sail trim, sail and hull-keel characteristics, the sail can actually transfer energy from the wind to the vessel rolling motion, which becomes unstable and therefore tends to grow with time. In a previous work the main factors governing this phenomenon have been individuated by means of both a theoretical approach and of a set of dynamic tests on a sail model in the wind tunnel. In this paper results of a more complete set of wind tunnel experiments, carried out in order to investigate the effect of the sail shape and aspect ratio and of the reduced frequency are reported. An analytical expression of the unsteady aerodynamic rolling moment acting on a sail is also derived and numerical results are compared with the experimental results. A worked example highlights the applications of the results.

  • Supplemental Notes:
    • STAB 94, 5th Intl Conf on Stability of Ships and Ocean Vehicles; 7-11 Nov 1994; Florida, USA. Sponsored by SNAME, USA and RINA, UK. Proc. Publ by Florida Inst Technology, USA. Vol 4, session 15 [21 p, 7 ref, 3 tab, 17 fig]
  • Authors:
    • Boccadamo, G
    • Tortora, E
  • Publication Date: 1994

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00717504
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Mar 4 1996 12:00AM