Developers of a multi-rotor hover craft billed as the first flying vehicle to be powered by hydrogen fuel cells unveiled a full-scale model in Southern California, in a show-and-tell that raised some eyebrows but never left the ground.
A mockup of the futuristic aircraft, dubbed “Skai” by its inventors, was put on exhibit for investors, the news media and other invited guests outside the BMW Group’s Designworks studio in Newbury Park, a suburb north of Los Angeles.
