Avicopter is testing a technology demonstrator for a vertical-takeoff-and-landing airplane with a central lift fan. The manufacturer, part of China’s state Avic group, exhibited the unmanned piston-engine aircraft at the China Helicopter Exposition in Tianjin this week. Flight testing of the aircraft, the Feihong, went smoothly at first, officials say, but the program is now working on such problems as trying to find the optimum method of achieving maximum altitude: with wing lift only, ...


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