SAY T
he SAY 29E currently holds the record as the fastest e-boat in the world (series production, 8-10 m). The
motors, comes from Siemens who have designed a motor for the aeronautical industry that could well be adapted they say, for marine use. With a weight of just 50kg the motor delivers a continuous 260kW (348hp), at just 2,500rpm which is about five times more power than equivalent systems.
With a new generation of digital controllers, managing the ebb and flow of energy with predictive intelligence and the fast development of battery technology, things are looking up. The Dutch manufacturer Mastervolt pioneered full-size 12 and 24 volt lithium-ion batteries for marine use. Their second generation, Ultra range are one third of the weight of an equivalent lead- acid design and come with a claimed life cycle of at least 2,000 deep discharges. Complex electronic circuitry connecting each cell ensures perfect charge and discharge balancing, and guards against the risk of overcharging.
Batteries employing the use of oxygen as one of the reagents are in development and could, be made for a fifth of the price and a fifth as light as lithium, and offer operation times five times
48kn fast and extremely seaworthy carbon composite construction is powered by a drive from Kreisel Electric, the most innovative supplier of e-mobility in Europe. A staggering 360 kilowatts provide the thrust for breathtaking acceleration and make the 29E the forerunner of a new generation of tenders and chaseboats. Her wavecutter bow and the sidewings of the ultra-light hull (at only 400kg) provide maximum stability and enable incredibly high speeds on all water conditions. Behind this special boat, the SAY brand and at the head of the shipyard is Karl Wagner, one of the most experienced carbon specialists in Europe. With his expertise Wagner raised the in-house quality standard and engineering at SAY to an automotive level and optimised the production.
Length 8.85m Beam 2.78m Engine Kreisel Top speed 48kn
Max engine capacity 360kW out put of 500hp Weight 1380kg
www.saycarbon.com
longer. Graphenano based in Spain has developed a graphene polymer battery called the Grabat, which it claims is 33 per cent the weight of lithium ion and four times the energy density. These batteries can recharge 33 times faster than lithium ion, and retain over 80 per cent of their capacity.
When it comes to powering yachts by electricity it would seem that the future is not far away. But what we do know is, that some of the electric tenders on offer are also pushing the boundaries of design aswell.
ONBOARD | SUMMER 2019 | 51
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