Fly and Surf Above the Water! Inspired by the movie Back to the Future™ and in tribute to the famous Silver Surfer™ the Hoverboard by ZR® is a hydro-propelled board, which allows the user to ride and surf in total freedom above the water. The Hoverboard by ZR® user can manage the board with ease and can reach up to 8 meters above the water, to an average speed of 40 km/h.