Page 21: of Marine Technology Magazine (May 2018)

Hydrographic Survey: Single beam and Multibeam Sonar

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of an equal load rating. Moving away from wire rope to the ticularly critical in offshore applications where heave com- adoption of synthetics can reduce the amount of horsepower pensation is employed. Cyclic bend over sheave (CBOS) required to drive single-drum winch drums, as well as reduce tests provide a controlled method for evaluating durability deck loads. In water, synthetics are either buoyant or close in applications where ropes are cycled on and off sheaves to neutral; this means they add little to no weight to the lift. and winch systems. Bending cycles-to-failure in CBOS test

Where synthetic ropes maintain system-lifting capacity re- equipment provide a quantitative means of comparing

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