Page 40: of Maritime Reporter Magazine (May 1981)

Ice Tech '81 (continued from page 43) decided to build a polar research vessel. The hull form of this re- search vessel has been designed by the Hamburg Ship Model Ba- sin. The most important achieve- ment was the development of ship lines which prevent the ingestion of ice into the propellers. This pa- per covers ice technological as- pects of the ship and reports on model test results.

Paper No. 19 — "Division of

Icebreaker Ice Resistance into

Components" by I.I. Poznvak and

B.P. Ionov.

SYNOPSIS—For the development of a concept design of an ice- breaker it is necessary to have a scientific, soundly based method of estimating ice resistance and of dividing the total ice resist- ance into components. This paper deals with the results of theoret- ical and experimental studies con- cerning the division of the ice resistance into its components and a proposed method for their estimation.

Paper No. 20 — "An Experi- mental Study of Hull Forms for the New Japanese Antarctic Ob- servation Ship" by S. Narita and

M. Yamaguchi.

SYNOPSIS: The Japanese Gov- ernment is building the nation's

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The new vessel is to be a 30,000- shp, triple-screw polar icebreaker and will be twice as powerful as her predecessor. This paper de- scribes the results of the experi- mental study of hull forms for both icebreaking capability, con- ducted at HSVA, and open-water propulsive performance, conduct- ed at the NKK Tsu Ship Model

Basin.

Paper No. 21—"Icebreaker Bow

Forms—A Parametric Variation" by P. Noble and V. Bulat.

SYNOPSIS: Using the lines of

Canada's most recent class of ice- breaker, the "R" Class, as a start- ing point, a model test program was undertaken to investigate possible improvements in level ice resistance and ridge penetration capability which might result from changes in the forebody shape of the vessel. A parent hull model and three variants were tested in the Artec Canada ice towing basin. This paper describes the developments of the various hull forms, the test program and the results of the analysis of the model test data.

Paper No. 22 — "Study of Ship

Ice Performance in Narrow Chan- nels" by V.I. Kashtelyan and L.G.

Tsoy.

SYNOPSIS: The growth of the di- mensions of ice class ships is in- hibited by the dimensions of ice- breakers employed in convoys.

The width of a channel controlled by the breadth of the icebreaker has proved one of the most im- portant factors affecting ship speed in the icebreaker channel.

This study is an assessment of the effects of relative channel width on ship speed in an ice- breaker channel. Some full-scale results and the results of model tests in the Arctic and Antarctic

Institute, Leningrad, are given.

Paper No. 23—"Results of Full-

Scale Trials in Ice of CCGS Pierre

Radisson" by R.Y. Edwards, B.

Johnson, M. Dunne, G. Comfort and V. Bulat.

SYNOPSIS: In July, 1978, the

Canadian Coast Guard accepted delivery of the first of the "R-

Class" icebreakers, the CCGS

Pierre Radisson. The ship was extensively instrumented prior to her maiden voyage which was to take her from Victoria, B.C., through the Northwest Passage to her new home port of Quebec.

Full-scale data gathered in thick first-year and multi-year ice in the Arctic and subsequently dur- ing winter operations provided performance information for a wide range of ice types, thickness and strength. This data is pre- sented together with 1/36-scale model experiment results.

Paper No. 24—"Performance of

CCGS Franklin in Lake Melville 1980" by M. Michailidis and D.C.

Murdey.

SYNOPSIS: This paper presents ice performance data of CCGS

Franklin as obtained from trials during two probes into Lake Mel- (continued on page 46)

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