Design phase remodel improves efficiency
The new ‘Orion’ has been delivered to her owners, replacing their previous vessel but with the added advantage of improved hull efficiency thanks to a study during the early design phase.
The decision to remodel the hull form was based on results from a tank testing program which Macduff Ship Design and Macduff Shipyard were running with the intent to improve hull efficiency.
The study was conducted by the Wolfson Unit in Southampton, using CFD technology, to compare the proposed new vessel against the previous model; the results showed a net decrease in hull resistance at steaming speed. Following this Macduff Ship Design faired and finalised the hull form and produced a full set of steel construction plans along with conducting the incline experiment and producing the vessels stability booklet at the end of the build.
The hull of ‘Orion’ is built completely from steel, apart from the wheelhouse and mast, and features a double chine hull form, transom stern and modern bow designed to cut cleanly through the sea with less energy leading to a reduction in fuel consumption and emissions along with increased crew comfort.
The fabrication of the hull of ORION was subcontracted to Kedat Shipyard based in Szczecin, Poland with the construction reviewed and verified by Bureau Veritas to comply with the MCA’s construction standard and, on completion, the hull was towed to Macduff for outfitting by the yard.
The propulsion package features a 2.5 m fixed pitch propeller supplied by Wartsila, driven by a CATERPILLAR C32 main engine with 660 hp @ 1600-1800 rpm through a Masson Marine W7400 reversible gearbox with 9.077:1 reduction. ‘Orion’ is the seventh vessel built by the yard in recent years to feature this propulsion package, which has demonstrated itself to be both robust and adaptable with the Wide Operating Speed Range of the C32 main engine providing flexibility to achieve full power from a fixed pitch propeller both whilst steaming and trawling.
The efficiency gains predicted during the early design phase were realised during engine trials with the vessel achieving 9.1 knots at only 50% engine load and 10.5 knots at 100% load.
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