REFIT SHIPYARDS
MMH
Nestled in Malta’s secure Grand Harbour, MMH is the premier maritime hub in the heart of the Mediterranean, renowned for 20 years of excellence in yacht and superyacht services. Their expert team delivers professional refit, repair, and maintenance solutions, ensuring unparalleled quality and technical prowess. Conveniently located near Malta’s airport and capital city, the hub offers dedicated offices, workshops, and warehousing for specialised maritime subcontractors. MMH boasts extensive facilities; these include two travel lifts capable of hoisting yachts of up to 700 tons, 1,200 metres of berthing space, 80,000 square metres of laydown area, and 20,000 square metres of covered area for indoor maintenance and works. For more details Tel: +356 21491060 or visit
www.mmh.com.mt
passed since it launched the 58.04 m SY Ethereal. Noted for her pioneering hybrid propulsion system and incorporating 400kWh of stored energy in her Li-ion battery bank, Ethereal has now logged several hundred thousand miles traversing the world’s oceans propelled either by sail, or by mechanical propulsion, or via her stored energy source. Her entire domestic load – in addition to sailing systems and anchoring functions – can source its power from this same set of Li-ion batteries, enabling true stealth mode operation.
The 46m / 152ft NextGEN ketch Elfje (delivered by Royal Huisman in 2014) incorporated the latest iteration of hybrid technology that informed the Ethereal project. While Ethereal’s ground-breaking hybrid system focuses on propulsion and power management, Elfje interprets ‘hybrid’ by supplying power via variable-speed, variable-output, variable fuel-consuming generators backed up by a Li-ion ‘peak-shaving’ power storage bank and an energy management system. Royal Huisman has continued to refine its technological leadership with remarkable projects, including the hybrid conversion (by Huisfit) of the 1999 cutter Foftein and the 1993 ketch Juliet.
More recently, for example, in Project 405 Nilaya, the Royal Huisman team developed a ‘tribrid’ propulsion system in response to the owners’ request for an emergency ‘get home’ engine. This flexible system provides two ways to power the variable pitch propeller without a supplemental third engine or gearbox, thus saving 2,000 kg. The propeller can be powered in two ways: mechanically (directly from the engine) and/or electrically (either from batteries or generators). The ‘tribrid’ system is a hybrid system with an additional smart hydraulic integration, allowing the engines and gensets to have an integrated powerpack for hydraulics. This is more efficient and makes it possible to turn off the generators during sailing. Additionally, when motoring, it is possible to turn off a second combustion engine (an inefficiently running genset), while the engine within the shaft line provides energy for the hotel consumers.
During engineering, it was possible to select a smaller main engine because maximum power output is provided when both the engine and electric motor are running. With this boost function, the main engine runs at a more economical rate while at cruise speed.
Similarly, a critical look at Nilaya’s HVAC system and selecting direct expansion and fan coils for each room shaved another 600 kg from system weight. A direct expansion system uses only one coolant instead of a conventional combination of chilled water and a coolant. The coolant requires smaller (and lighter) piping without insulation since the coolant does not lose energy during transport. Therefore, this system is lighter and more efficient. The battery system provides zero emission sailing and anchoring, allowing one to motor into fjords and other no-emission cruising zones and sleep without the generators running.
ONBOARD | WINTER 2024 | 105
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