Sweden’s Radinn—short for Radical Innovation—has introduced the Wakejet Cruise jet-powered surfboard, which features the latest in board-sport technology. Similar to powered surfboards from Jet Surf and other companies, this board is powered by an onboard motor. The Wakejet Cruise features a jet-propulsion engine, which the user controls by wireless handheld remote. The board can travel for up to a half hour at its top speed of 25 knots or for up to a full hour at slower speeds. (The replaceable battery pack h…