Amazing stuff!
"Ukraine has, for the first time, sent into combat a hybrid drone powered by hydrogen fuel. According to the builder Skyeton, a variant of its Raybird was deployed for full-scale combat duty with the Ukrainian Armed Forces in an active war zone.
Hydrogen-powered drones aren't exactly new. They've been around for almost 20 years, though previous examples were mainly technology demonstrators and experimental prototypes. Usually, these were intended as long-endurance, high-altitude craft, though an Israeli-US system called Heven AeroTech Z1 is intended for front-line missions, but this has yet to be deployed. ...
The hybrid system means that craft is quieter compared to a four-stroke engine and has a negligible heat signature, though its altitude is limited to 18,000 ft (5,500 m). ..."
The Raybird is the first hydrogen drone sent into combat
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