Two experimental trawls were designed as a joint task between the Danish partners and the Russian trawler fleets which were going to test them. The new design incorporate use of modern Western high strength material. The engineering performance of the trawls was analysed using computer based simulation programs and flume tank tests. The new designs were compared with two conventional trawls used by the Russian partners with respect to overall geometry and towing resistance. The new trawls have better performance than the conventional trawls. The vertical opening in the trawl mouth is greater and the towing resistance is less. The trawls fishing capacity was tested and compared with the conventional trawls on commercial fishing trips in August and September 1996. One trawl of a typical Danish two bridle design was far better than the corresponding Russian trawl. In some fisheries the catch per haul was more than four times the catch of the Russian trawl. The other trawl, a four bridle design, which was a compromise between Danish and Russian design philosophies had a catch efficiency comparable to the Russian trawl. The experimental trawls were both easier to tow than to conventional trawls. A reduction in the towing power of 20% for the trawl designed to MurmanRyprom and 30% for the Turbo trawl designed to Murmansk Trawl Fleet when towed at the same speed is foreseen. The reduction in the overall fuel consumption is estimated to 5% and 7% only due to the operation profile and the layout of the vessels. (LN)
Development of energy efficient mid-water trawls to Murmansk trawl fleets
1996
43 pages
Report
Keine Angabe
Englisch
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