Just when you thought quadcopters lacked persistence, let me introduce you to the hydrogen powered Hycopter made by Horizon Corp in Singapore. (4 hours w/o external payload, 2.5 hours with payload)
This is both a good news and bad news story. We may have certain niche uses for such a capability where current Li-ion systems don’t make the grade for ISR or other missions. On the bad news side, it will be a really bad day if this technology falls into terrorist or radicalist camps (ISIS and others).
http://www.uasvision.com/2015/05/11/hydrogen-fuel-cell-powered-quadcopter/
http://newatlas.com/horizon-energy-systems-hycopter-fuel-cell-drone/37585/
http://www.hus.sg/hydrogen-multi-rotor?utm_campaign=Horizon%2BEnergy%2BSystems%2BAnnounces%2Bnew%2B700Wh%2Fkg%2Bfuel%2Bcell%2Bfor%2Bdrones&utm_medium=email&utm_source=Composite%2BUAV%2Bframe%2Bstores%2Bweightless%2Benergy%2B%2F%2Bmulti-rotor%2Baims%2Bfor%2B4hr%2Bflight
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