Rolls-Royce's all-electric airplane smashes record with 387.4 MPH top speed
It also hit altitude and average speed records, the company claims.
Spirit of Innovation
We won't have electric airplanes until battery tech improves
They're still too heavy and underpowered to make electrified air travel feasible.
Rolls-Royce's all-electric aircraft completes 15-minute maiden voyage
It has the most power-dense battery pack ever built for an aircraft, the company said.
