Icebreaking performance model tests described in this paper demonstrated that the hull form, incorporating a modern bow design, for a new design Canadian Coast Guard medium icebreaker exhibits icebreaking performance superior to that of the CCGS NORMAN MCLEOD ROGERS. Furthermore the model icebreaking performance data for this new design hull correlates well with existing model and full scale data for icebreakers with similar gross dimensions. The icebreaking performance of the newly designed hull form (referred to as the "R" Class hull) was compared with that of CCGS NORMAN MCLEOD ROGERS in uniform plate ice and in mush ice, a compacted aggregate of finely broken ice typical of heavily trafficked canals, rivers and harbors. The measure of performance employed during these tests was the appendaged hull resistance as measured in a constant speed towing test. The resistance of the "R" Class in the deep draft condition was found to be between ten and sixteen percent lower than that of "R" Class at design draft. It was also determined that the resistance of the "R" Class in the deep draft condition was as much as thirty percent lower than that of the ROGERS for reasonable speeds and ice thicknesses. The tests indicate that the "R" Class icebreaker in deep draft condition with her propulsion plant producing 15,000 SHP, is capable of maintaining a speed of advance of approximately three knots in three feet of uniformly thick lake ice.

Media Info

  • Pagination: p. 80-100

Subject/Index Terms

Filing Info

  • Accession Number: 00095016
  • Record Type: Publication
  • Source Agency: Arctic Institute of North America
  • Files: TRIS
  • Created Date: May 19 1975 12:00AM