Author(s): Stephen J. Jones; K. C. Hardiman; R. Ritch; R. Abdelnour
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Abstract: In order to determine the effect of density on the trajectory of ice pieces around a ship's hull, a study was carried out in which a 1/20 scale model of the R-Class icebreaker was towed through ice of different densities, ranging from 0.80 to 0.92 Mg/m3. The ice used was Fleet Technology's MOD-ICE, a wax based material which could be formed at different densities by varying the proportions of its five ingredients, and the tests were conducted at their model basin in Calgary. Three underwater video cameras, and one still 35 mm camera, were used to record the movement of the ice pieces around the hull. The results from these tests were also compared with tests in EGADS model ice of density 0.94 Mg/m. Results showed that increasing the density led to increased submergence times for the ice, thus increasing the chance of ice/propeller interaction. Piece size, also, had an effect, the smaller pieces rising to the surface more rapidly than the larger. There was less propeller/ice interaction for the slower speed tests than for the higher speed tests.
Year: 1990