Rolls-Royce has flown its all-electric Spirit of Innovation aircraft and says it will embark on an intense testing program to validate its engineering projections. The sleek prototype took off from the U.K. Ministry of Defense’s Boscombe Down test facility on Sept. 15. for a 15-minute hop. The flight was uneventful. The aircraft differs from most … Continue reading Rolls-Royce Flies Electric Prototype