https://phys.org/news/2018-07-rolls-royce-unveils-hybrid-taxi-farnborough.html > Rolls said it hoped to manufacture a prototype version of its electric vertical take-off and landing (EVTOL) vehicle within the next 18 months, and could potentially take to the skies in the early 2020s. > The Rolls-Royce EVTOL plane will seat four or five people, with a flying range of 500 miles (805 kilometres) and a top speed of 200 miles per hour.