ALBAWABA - Unither Therapeutics, a US-based biotechnology company specializing in innovative treatments for chronic illnesses, has announced the successful test flight of the world’s first hydrogen-powered helicopter. R44 first hydrogen helicopter US company Unither Therapeutics announced the test launch of its hydrogen-powered helicopter. According to the company, the aircraft successfully completed a test flight lasting three minutes and 16 seconds in total. Notably, the R44 helicopter was equipped with a ...