A company with experience producing fuel-cell propulsion systems for military unmanned air vehicles has unveiled plans to develop a hydrogen-electric four-seat aircraft. With significantly longer range than battery-powered electric aircraft, the Element One is designed for regional flights between country towns, says the concept's developer, Singapore-based HES Energy Systems.The Element One concept combines hydrogen fuel cells with distributed electric propulsion to enable the aircraft to fly up to 500 km (310 mi.) with compressed gaseous-hydrogen storage and up to 5,000 km with liquid-hydrogen storage, says Taras Wankewycz, HES managing director.
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机译：一家拥有为军用无人机生产燃料电池推进系统的经验的公司宣布了开发氢电四座飞机的计划。该概念开发商的总部设在新加坡的HES Energy Systems表示，Element One的续航里程比电池供电的电动飞机长得多，专为乡村小镇之间的区域性飞行而设计。ElementOne概念将氢燃料电池与分布式电力推进相结合，从而实现了HES常务董事Taras Wankewycz说，这种飞机在压缩气态氢存储下可以飞行500公里（310英里），在液态氢存储下可以飞行5,000公里。
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