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Haxel demonstrator will test propulsion technology for Piasecki’s planned hydrogen-electric PA-890. Credit: Piasecki Aircraft Piasecki Aircraft is preparing to modify an ultralight helicopter by ...

AUSTIN – Remember, if you can, the thrill of driving a go-kart. Then imagine flying one in three dimensions, swooping up and down, back and forth and side to side in an aerial dance. That’s how I felt ...