The modified R44 has a hydrogen tank under the tailboom and two cooling nacelles on either side of the cabin.
Credit: Unither Bioelectronics
Unither Flies First Piloted Hydrogen-Powered Helicopter The first piloted flight of a hydrogen-powered helicopter has been accomplished in Canada by Unither Bioelectronics. A subsidiary of biotechnology company United Therapeutics, Unither modified the piston-powered Robinson R44 to hydrogen...
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