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" ... In 2015, they applied for a series of patents and began testing small, 1:10th scale prototypes in a wave tank at the University of Cantabria, on the northern coast of Spain. They soon discovered that the principle worked and the turbines, or freewheels, absorbed the wave energy. The research also helped the team determine where the freewheels should be placed and the optimum design of the outer framework, so that it could easily cope with waves up to five meters in height. ... "
" ... They work by storing energy generated as the flywheel spins at up to 60,000 revs per minute when the car freewheels or brakes, then returning it to the vehicle as it accelerates. Volvo has been at the forefront of developing flywheel power and demonstrated the possibilities in a S60 sedan. The experiment showed up to a 20 per cent improvement in fuel consumption with comparable performance. ... "