During the last four years the U.S. Coast Guard has been investigating the nature of the resistance experienced by icebreakers in ice-covered waters. A substantial amount of experimental data on continuous and ramming-mode icebreaking operations has been accumulated which includes full-scale tests in lake and sea ice and model tests in fresh and sea ice. From the theoretical treatment of the subject a number of nondimensional variables evolve which allows all of these data to be reduced to a common base. These reduced data are then analyzed using statistical methods to produce semi-empirical relationships between ice resistance and parameters characterizing the ship and ice cover. These relationships can be used by designers to determine for new ships the power required to proceed through ice cover of known characteristics at a desired speed of advance. They can also be used to gain some insight into the influence of the hull form on ice resistance. The predictive ability of the semi-empirical relationships is evaluated by comparison with separately analyzed full-scale data. The predictive ability of the model test results is also evaluated. This is accomplished by performing statistical analyses of only the model data and comparing the results with full-scale data. In both cases the agreement with the full-scale data is good.

  • Corporate Authors:

    Society of Naval Architects and Marine Engineers

    601 Pavonia Avenue
    Jersey City, NJ  United States  07306-2907
  • Authors:
    • Lewis, Jack W
    • Edwards Jr, Roderick Y
  • Publication Date: 1970

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 30 p.
  • Serial:
    • Volume: 78

Subject/Index Terms

Filing Info

  • Accession Number: 00007484
  • Record Type: Publication
  • Source Agency: Society of Naval Architects and Marine Engineers
  • Files: TRIS
  • Created Date: Mar 23 1973 12:00AM