Many of the start-up firms that are developing electric, hybrid electric or hydrogen electric propulsion systems for aircraft already have prototypes flying in the skies. These flights are for certification and demonstration purposes as the Federal Aviation Administration (FAA) handles an extensive backlog of more than 100 companies lined up for certification.
E-Propulsion Start-Ups Generate Flurry of Summer Activity
This summer has seen a raft of announcements from start-up firms developing electric propulsion systems for aircraft.
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