Rolls-Royce developed the ACCEL as a
racing aircraft to gain the all-electric
air speed record, targeting over . The existing electric aircraft record at that time was , set in 2017 by a Siemens powered
Extra 330. On 15 September 2021, Rolls-Royce announced the aircraft, named
Spirit of Innovation, had successfully completed its first flight, flying from
MoD Boscombe Down for fifteen minutes. It subsequently reached a top speed of , and sustained over 3 km, over 15 km, and was able to climb to in 3min 22s. The speeds achieved were accepted as world records for electric aircraft by the
Fédération Aéronautique Internationale in January 2022. == Design ==