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CLEAN ENERGY CRUISING


DESIGNERS OF ELECTRIC TENDERS ARE PUSHING THE BOUNDARIES OF TECHNOLOGY AND AESTHETICS IN THEIR QUEST TO DELIVER ECO-FRIENDLY TENDERS TO SUPERYACHTS WORDS: MICHAEL HOWORTH


D


emand is growing for the marine industry to provide clean, quiet, and affordable alternatives to combustion engines for use in tenders. Experts in the field of clean energy are


confident that the new breed of electric motors coming onto the market will satisfy both boat builders and end user requirements. As a result, there is an air of excitement among boatbuilders who believe clean and quiet alternatives are about to change the way tenders are built and used on board superyachts.


Electric engines are designed to be a direct replacement for a traditional diesel engine both in size and cost. Already several 48 volt DC electric motors, designed to replace small diesel engines are available for boats up to 10 metres and larger canal craft. Companies are manufacturing and marketing marinized chargers and inverter/chargers which, when working alongside lead acid and lithium batteries, complement and facilitate the use of electric motors to drive water jets and conventional propellers.


The efficiency of these new style drives means that there are new tenders emerging onto the market that offer an excellent


50 | SUMMER 2019 | ONBOARD


range as well as being easy to service and maintain on board the mothership. Without the need of water cooling systems or gearboxes and with their direct connection to shafts, electric tenders are, right now, at the cutting edge of technology. Several are now beginning to emerge onto the market that feature motor direction, throttle and navigation controls in one digital colour touch screen display that really look like the future has already arrived.


For those looking to reduce both noise and emissions, the affordable electric option offers really efficient and reliable electric that are sensible alternatives to the traditionally powered superyacht tender.


Rim-driven and brushless motors capable of delivering more torque using less energy are becoming available to boat builders and with new lithium batteries capable of storing a higher charge from deep cycle charging which crucially can be repeatedly undertaken without damage, the electric boat scene is gathering momentum. One of the most recent breakthroughs in the world of electric


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