2-Stroke and 4-Stroke – Page 58
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NewsWater jacket cooling for propulsion and thruster motors
Italian company Marelli Motori describes its range of water-cooled electric motors designed for today’s more efficient and better optimised ships.
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News
Breakthrough orders for large thrusters
Finnish company Steerprop has recently received orders for its propulsion units for projects in Russia and India.
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NewsHigher speed four-strokes enter OSV marketplace
Traditionally, four-stroke medium speed prime movers have been used to power ships operating in the offshore support sector, either as part of a mechanical propulsion system or, as is increasingly the case, at the heart of a diesel-electric (or gas-electric) power plant.
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NewsCat medium speed power for towboats
Towboats used on the US waterways tend to have particularly long service lives, meaning that repowering is not uncommon as original engines wear out or become obsolete, and the increased efficiency and better economy of newer machinery makes replacement cost-effective.
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NewsDual-fuel four-strokes provide clean alternative
It is not only in the offshore and passenger sectors that gas and dual-fuel four-stroke engines are believed to offer a viable option for future propulsion requirements.
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NewsRo-ro and passenger ships provide four-stroke orders
Alongside the flourishing offshore support ship industry, the ro-ro sector has been picking up some welcome orders, which has been good news for the major four-stroke engine companies.
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NewsSurface drive principles applied to large ships
In recent years, surface drives have been applied almost solely to small, fast, specialist boats, but, as Dag Pike recounts, the concept is being revisited for large vessel propulsion.
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NewsInland waterway tanker produces ‘up to 90% less NOx’
Volvo Penta of Sweden reports that its propulsion and genset engines are used onboard the ‘MTS Duandra’, described as the first semi-hybrid inland waterway tanker.
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NewsFuel saving and low emissions are priorities across the board
All sectors of the maritime market are concentrating on cutting costs and regulatory compliance, and even markets such as naval vessels, largely coming outside MARPOL jurisdiction, are showing a desire to be environmentally responsible.
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NewsComposites make for propeller efficiency
A composite propeller for smaller ships has been launched by UK-based Axiom Propellers. The Axiom propeller’s composite construction is design primarily to save fuel and increase efficiency, through its light weight and optimised blade profile.
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NewsNiigata adds new gas-burning designs to its range
Augmenting a remarkably broad portfolio of machinery for both marine applications and stationary power generation plant, Niigata Power Systems has developed two new, medium-speed gas-burning engines in the spark ignition (SI) and dual fuel (DF) categories respectively, which are described by David Tinsley.
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NewsPiston seals for high-viscosity cylinder oils
The RDPS Alpha piston sealing system has been developed to counter problems resulting from the effects of emission regulation and slow steaming on cylinder lubrication, as described by Ernie Terry of Marine Sealing Services, UK.
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NewsCat goes for pure gas genset power
At the recent SMM exhibition in Hamburg, Caterpillar Marine Power Systems announced that it is currently developing a high speed gas engine based on the 3500 engine platform.
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NewsA shorter route to greater profits
Wärtsilä’s so-called ‘new generation’ – the Generation X series – of two-stroke engines was introduced in May 2011, with the aim of significantly contributing to lowering marine engine fuel costs and improving environmental performance.
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NewsProgress on gas-fuelled two-strokes
The pressure to find alternative fuels, driven by both emissions legislation and the resulting commercial pressures that threaten to drive up the cost of low-sulphur fuel oils, is impacting on the low speed engine market.
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NewsSuccess for Norwegian electro specialist
Norwegian Electric Systems says that since it was established in October 2009, it has achieved a sales turnover close to 1 billion NOK.
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NewsNew high-speed propulsion and gas-fuelled genset engines added to Cat high-speed range
Caterpillar Marine Power Systems has announced a new high-speed propulsion engine based on its 3516 platform, but optimised to deliver clean-burn combustion along with an up to 15% power increase in its commercial ratings.
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NewsVoith adds swing-out capability to rim-drive thruster
At the recent SMM show in Hamburg, German manufacturer Voith featured a new version of its rim drive thruster - a retractable azimuthing unit.
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NewsMAN boosts dual-fuel marine offering
MAN is adding a new string to its bow in the dual-fuel stakes through the development of the 35/44DF marine engine, to serve a broad power band in 10 configurations, writes David Tinsley.
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NewsNew propulsor designs target speed and manoeuvrability
Some are still on the drawing board, but a range of new propulsor designs are expanding speed and manoeuvrability limits for high speed vessels, says Wendy Laursen.
