The two-metre-tall part-scale demonstrator ofthe 5MW VAWT, made up of a long stabliser tube that rotates in the water, avertical-axis rotor and a spar-type foundation, was trialled at Marin'sfacility in Wageningen in waves equivalent to real-life heights of 15 metresand currents as fast as four metres per second.

“A key point in these tests is that wind andwaves are present simultaneously in a controlled environment, allowing thestudy of the complex motions and loads of the rotating wind turbine in wind,waves and current," says Marin project manager Erik-Jan de Ridder.

"These