Feature 2 | MARINE COMPOSITES & CONSTRUCTION MATERIALS Light research
Albatross Marine Design’s forthcoming CPCK1200 oil research cats have incorporated a mixture of composites into their hull forms, decks and superstructures
its CPCK1200 workboat catamaran class completed by Russian construction yard Composite Shipbuilding. The craft are destined for operations in the Sakhalin area, in Eastern Russia, where they will used for oil research purposes in the shallow coastal area of Amur Delta and Sakhalin Island. Each vessel features an all-composite
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hull, fashioned from FRP. Coremat, a composite technology based on polyester fibres and featuring microspheres for binding, has been applied to the bottom and lower hull sides, while honeycomb sandwich panels have been added to the upper sides, as well as to each cat’s deck, wet deck and superstructure. Te design of the structure was performed using finite element analysis (FEA) methods, in Strand7 soſtware, enabling the AMD team to analyse the performance of the composite structures when enduring complex loads. AMD has collated statistics for its
in-house-designed monohulls and cats, in order to compare the weights of structures for aluminium and composites (see graph). While one of the key advantages of composites is their ability to reduce overall vessel weight, AMD managing director Albert Nazarov says: “It should also be considered that some catamarans have ample superstructures, thus causing an increase in structural weight.” He highlights the dropout points at 12-16m on the graph as an example of this. However, he adds: “Composite materials allow a better use of space in the hulls, as there is far less stiffening required compared to metal structures.”
Speed control Upon completion, the twin cats will measure 11.8m x 4.8m, will have a displacement, when fully loaded, of
50
hailand-based designer Albatross Marine Design (AMD) is close to seeing the first two vessels in
Weight comparisons compiled by AMD
The CPCK1200’s hull is a mix of FRP, Coremat and honeycomb sandwich panels
20tonnes, and will accommodate up to two members of crew and 10 researchers. Two tanks will provide a combined fuel capacity of 2,000litres, while the vessel is able to carry 300litres of water. The deckhouse is mounted on a raft
structure, pushed forward, and contains a steering station and up to three work stations for the researchers. Each cat’s demihull area has been split into five watertight compartments, including living quarters, crew bunks and a toilet and small galley, while the engine rooms and aft peaks can be accessed via the deck hatches.
Propulsion is provided by two Doosan L136 engines, rated 118kW each, with shaſt drives and steering nozzles, resulting in a top speed of 10.6knots when the vessel is fully loaded. The operator can independently control the nozzles to achieve slow speed operations, even when operating in strong currents. According to AMD, the craſt should prove capable of maintaining full control at speeds of 2-3knots. An ice belt can also be fitted on each cat,
classed by the Russian Maritime Register of Shipping (RS) to Ice 3 standard and the bow section below the waterline is filled with foam, to ensure a buffer against the effects of collision. Deep tunnels have also been designed at the stern for the propulsors, to minimise operational draught. While the exact identity of the owner remains confidential for now, this customer has requested that the cats are classed by RS. However, Nazarov points out: “Tis might be challenging, as the RS’s rules for composite craſt are obsolete.” Both vessels will be delivered in June this year. SBI
Ship & Boat International May/June 2013
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