NZ Work Boat Review

NZ Work Boat Review 2013

The only specialised marine publication in Oceania that focuses on the maritime industry, from super yachts to small craft to large commercial ships, including coastal shipping, tugs, tow boats, barges, ferries, tourist, sport-fishing craft, je

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Home in New Foundland the on-road rig with its purpose-built fifth wheel tow and support vehicle Knave remains very nippy underway four tanks with 600 port and starboard aft, 260 port and starboard for'ard, making for a heap of petrol on board, although the majority of the time it will be only using the 2 x 600 litre tanks in the aft of the vessel." The 9m hydrofoil supported catamaran was built by Bladerunner Boats in Kumeu to a mix of both Australian 2B and New Zealand maritime safety standards, both of which are in excess of the Canadian standard requirements so Knave received her safety approval on arrival. This is one chunky work boat weighing in at 5500kg light ship, add another tonne and half of fuel and water plus an extra 500kg or so for gear and we are starting to see some serious displacement, which explains why we have twin 250hp Yamaha four stroke outboard motors with 30in legs. The choice of outboards was simple: mainly to be able to get the best power to weight ratio, and to keep the working cockpit low and clear. Outboards also allow for a quicker turn around if one were to die. Plus the price differential between petrol and diesel in Canada is minimal, with petrol or gasoline tracking lower than diesel. Breather snorkels draw air from inside the transom 28 NZ WORKBOAT REVIEW 2013 The transducer arm locked in the down position lockers to supply dry, cool air to the two outboards. A strong, fully fenced boarding platform is mounted between the motors that not only allows ease of access for servicing and running repairs, it doubles for diver recovery, and for when working astern. From the cockpit, the davit and side-scan sonar transducer pod dominate the starboard side. The sonar transducer pod is a masterpiece of engineering, able to be easily moved from stowed, to deployed position by one man. It also doubles as a normal lifting davit for bottom sampling and the like. Once the transducer pod is deployed it is securely locked into a supporting bracket and clamped on the lower belting, meaning the vessel can operate at survey speeds of up to 12 knots. The primary survey tool is an R2sonic multi-beam connected to an Applanix wave master POSMV system. This provides heading and position, yaw, pitch and roll information. The back up for this is a Trimble hemisphere DGPS and a Maretron compass that can supply information to the boat if the equipment had to be removed for other jobs. The navigation system is a toughbook computer running MaxSea that interfaces with a 12 inch Navnet 3D system. There is a Vartech

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