waterjets on the other two ferries were also exchanged and the yard was finally able deliver the ships. Norled, their owner, is now successfully operating the vessels within the Norwegian short-sea sector. Norled is forecasting savings of approximately NKr1.2 million
(US$ 0.2 million) a year based on 3,500 operating hours annually. Ivan Fossan, managing director of Norled, was pleased that Oma Baatbygeri had discovered why its new vessels did not reach the agreed speed. “Thanks to the MJP waterjets we are not only reaching the desired speed, but saving a substantial amount of fuel oil at the same time,” he said in a statement. MJP Waterjets has, in the past few months, significantly
strengthened its position in the marine propulsion market through the acquisition of UK-based Ultra Dynamics last November. The two companies have established expertise in two complementary areas, with MJP Waterjets best known as a supplier of stainless steel mixed-flow waterjets, delivering
heavy duty propulsion systems in the 350mm to 1750mm range, while Ultra Dynamics, which has manufacturing sites in the UK and US, is well respected in the field of aluminium axial-flow waterjets in the 250mm to 650mm range. MJP said that the enlarged organisation aims to extend its
presence in the marine market still further and will “offer some exciting projects in the very near future.” The two teams are now working jointly on R&D initiatives with a view towards strengthening both project lines. “When talking synergies, this merger is exemplary, with two product ranges complementing each other to a degree which has seldom been witnessed in the maritime market,” Mr Andersson added. More recently MJP has made another acquisition, taking over
the Swedish firm, AWT i Nacka, a specialist in automation and control systems for waterjet applications. MJP said this business would further strengthen its competiveness, products and services in the waterjet sector. PST
Naval waterjet to offer passenger ship benefits
Rolls-Royce has developed a new waterjet type, the Axial Mk1 unit. The launch unit has been delivered for use with the high speed Littoral Combat Class (LCS) ship currently under construction for the US Navy. However Rolls-Royce says it believes the technology is applicable to high speed passenger craft as well as military vessels. The Axial Mk1 waterjets are very power dense
and are designed to deliver more cavitation-free performance for their size and power than any other waterjet. At 22MW, a single waterjet can move almost 2,300m3 of seawater a minute, propelling the LCS at speeds of more than 40 knots. The new waterjets are being produced in the
US, with primary manufacturing taking place in Massachusetts and Mississippi and Rolls-Royce chief engineer Frank Lanni explained that the company had developed these waterjets “to meet the high standards of efficiency and robustness demanded by the US Navy, while incorporating proven commercial components and hardware to minimise costs and maximise the availability of the platform.” He believes the jet “represents the standard by which all future designs will be measured.” The underlying design of the Axial Mk1 has been
scaled for other uses. For example, the waterjet has been retrofitted on Sealion, a special operations test craft. In another significant development, Rolls-Royce has signed a contract to deliver its Azipull propulsion and control system for a new vessel that will operate on battery power alone. The vessel is being built at the Fjellstrand yard in Norway and will be operated by Norwegian transport company Norled between the ports of Lavik and Oppedal. In 2010, the Norwegian Ministry of Transport
announced a tender to develop a new ferry that was 15-20 per cent more energy efficient than existing vessels. The Rolls-Royce Azipull propulsion system, which uses pulling propellers as opposed to conventional azimuth thrusters, was successful and
A Rolls-Royce apprentice working on an Azipull propeller unit. The technology will be used on Norled’s battery-only ferry design
will help the battery powered aluminium catamaran meet these standards. According to Rolls-Royce, the Azipull technology
will provide Norled with a combination of good manoeuvrability and reduced energy consumption, contributing to significantly reduced operating costs and improved environmental performance. Its streamlined leg and skeg recover swirl energy from the slipstream, raising overall propulsive efficiency. This contract marks the 10th anniversary of the
delivery of the company’s first Azipull thrusters, which were also to vessels building at Fjellstrand shipyard. The Azipull combines the advantages of the pulling propeller with the flexibility of mechanical drive and can be linked to any prime mover. It is designed to offer efficient propulsion and manoeuvring on higher speed vessels , typically 20-25 knots. The ferry will have a capacity of 120 cars and
360 passengers and will operate at a speed of about 10 knots, taking 20 minutes to cross between Lavik and Oppedal. The ferry will charge its lithium- ion batteries while loading or unloading cars, and overnight when moored along the quay.
www.passengership.info
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