People don’t just fly kites for fun. At a test site near Munich, engineers recently launched an electricity-generating, box-style kite fitted with small, wind-catching rotors. The contraption, tethered to the ground by a hefty cable, flew repeatedly in a predetermined figure of eight — its rotors spinning in the wind. “The wind speed is a couple of times higher than that a conventional wind turbine would see,” says Maximilian Isensee, chief executive of Kitekraft, explaining how the very movement of the kite itself boosts power generation. “That’s why we can get away with much smaller rotors.” The figure of eight…
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