Home Electric Aircraft The Skai VTOL: 400 miles, zero-emissions, hydrogen-powered. The Skai VTOL: 400 miles, zero-emissions, hydrogen-powered. 2 Sep 2019 | Air Taxi, UAM/AAMeVTOLHydrogenNews This High-Tech VTOL Is the First to Harness Hydrogen for Eco-Friendly Flights The bird’s 400-mile, zero-emission range makes it especially interesting.