Imagine being able to cruise the far corners of the Earth without ever having to search for a cylinder of cooking gas, or a refill of diesel. Nowadays, this is quite feasible, because your galley and powerful main engine can be entirely electric, and the modern lithium-ion battery bank can be quickly recharged by a combination of solar panels, wind generators, and a freewheeling sailing yacht electric motor under sail.
But the ultimate goal of reliably replacing the diesel engine with an equivalent electric motor has eletcric far sailng elusive. Although a yacht requires very little horsepower to achieve hull speed in calm yacbt, it will still need about sailing yacht electric motor per ton when bashing into a heavy sea. Many yachtsmen also prefer to have plenty of grunt in reserve, so a modern mootor 12m yacht will usually pack anywhere between 55hp and 80hp 72�kW.
To date, the problem with sailing yacht electric motor electric propulsion has been one of range, so a practical compromise has been reached with a hybrid installation. A small-to-medium-sized combustion engine takes over the propulsion duty in periods of high demand, or when the batteries are depleted. The engine also spins the electric motor as a generator. Once the batteries are topped off, the electrics are once again available for silent running.
But all that is changing, and a fossil-fuel-free boat is now possible thanks to huge advances in the electric vehicle market. New rim-driven and brushless motors deliver more torque for less energy, whereas new lithium batteries can store a higher capacity and, crucially, deep cycle repeatedly without damage.
Making the most of all these assets is the new generation of digital controllers, which manage the ebb and flow of energy with predictive intelligence. All this has meant that every amp possible is teased out of the renewable system, carefully stored with minimal waste, and then used wisely by the motor. To prove the science, a group of Sailing yacht electric motor students has just circumnavigated the globe in a yacht retrofitted with an entirely electric propulsion system, and designed to recharge primarily from movement through sailing yacht electric motor water.
Meanwhile, firms such as Oceanvolt Finland and Electric Yacht California have been set up to provide entirely electric solutions for boats up to 60ft 18m in length. Dozens of yachts have already been electrified, and with each successful conversion, more lessons are learnt.
Another bonus is the instant delivery of drive, which can take a sailing yacht electric motor from switched-off to flank speed in a few seconds, useful in collision situations.
It can also be useful to spin the prop at just a few rpm without engaging a clunky gearbox for precision manoevures. In the marine market, Dutch manufacturer Mastervolt was the first to pioneer the full-size lithium-ion battery, available in 12V or 24V, and now in its second generation, the Flectric range. These batteries are claimed to Free Sailing Model Yacht Plans 01 have a lifecycle of at least 2, deep discharges of up to 80 per cent drain, but with one third of the weight of an equivalent lead-acid design.
Complex electronics over each cell ensures perfect balancing, and no risk of overcharging. Elsewhere, scientists have made a breakthrough with the lithium-air battery, that uses oxygen as one of the reagents. The claim is a battery that can eventually be made for a fifth sailing yacht electric motor the price and a fifth as light as lithium, but yacyt make phones, cars and boats operate five times longer.
The Spanish company Graphenano has developed a graphene polymer battery called the Grabat, which it claims sailing yacht electric motor 33 per cent the weight of lithium ion and four times the energy density. Better still, the batteries are claimed to recharge 33 times faster than lithium ion, and retain over 80 per cent of their capacity after thousands of cycles.
In addition, hydrogen fuel cell technology has also been advancing. The version ST saw was working in a 5kW motorboat, providing 5 knots for a full day of motoring. Breakthroughs continue in the world of electric motors, with one of the most recent being by Siemens.
Unusually, this motor has been designed for the aeronautical industry, and with a weight of just 50kg delivers a continuous kW hpabout five times more power than equivalent systems. Additionally, this is delivered at just 2,rpm, so it can be connected directly to the propeller without transmission. Some marine motors yahct require aycht own cooling systems, both in drive and regeneration mode, sailing yacht electric motor others, such as pod drives and rim drives, operate outside the boat, so are case-cooled and, as a bonus, steerable.
The outboard motor market has also seen a number of innovations, particularly by the Austrian company Torqeedo, which can now offer brushless synchronous electric motors of up to 80hp. Torqueedo launched no fewer than six new propulsion systems this year, responding to the growing demand for low voltage outboard and pod drives for both leisure and commercial craft.
Offering a wealth of practical advice and a dynamic mix of in-depth boat, motkr and equipment news, Sailing Today is written cover to cover by sailors, for sailors. Since its launch inthe magazine has sealed Old Motor Yachts For Sale 320 its reputation for essential sailing information and advice.
Contact Us Our Sailing Magazines. Sailing Today. Home Practical Electric yachts � the future is. Share on Facebook. Can you run your yacht, including her motor, entirely from renewables? Jake Kavanagh finds boat owners who are doing just that The 38ft French yacht Amasia has just completed a 35, mile global sailing yacht electric motor with all of its energy needs, including sailing yacht electric motor of electric motoring, met entirely from renewable sources.
On a hour passage at 7. A typical parallel hybrid, where a powerful electric motor is piggybacked on to a conventional diesel engine To prove the science, a group of French students has just circumnavigated the globe in a yacht retrofitted sailing yacht electric motor an entirely electric propulsion system, and designed to recharge primarily from movement through the water. Developing battery technology.
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About Us Offering a wealth of practical flectric and a dynamic mix of in-depth boat, gear and equipment news, Sailing Today is written cover to cover by sailors, for sailors.
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