Sinclair C5 the event they did not, the project could not continue, due to thermal problems. Neither the C10 nor the C15 ever left the drawing board. Although Sinclair went on to produce more (but much smaller) electric vehicles, the C5 debacle did lasting damage to the reputation of subsequent EVs in the UK, which the media routinely compared to the C5. It was not until a highly regarded manufacturer, Toyota, launched a serious and well-received vehicle in the 1990s, the Prius, that the C5 "jinx" was finally laid to rest. In 2017 Sir Clive's nephew Grant Sinclair presented what he called
Personal air vehicle breakthroughs. A ground transport alternative is enabled by unmanned aircraft technologies: Autonomous Systems and electric propulsion. Barriers include aviation safety, airworthiness, operating costs, usability, airspace integration, aircraft noise and emissions, tackled first by small UAS certification then experience. Other names discussed include PIVITOLs (Personal Vertical TakeOff vehicles), Air-cars, PACs (Personal AirCraft), AVs (Air Vehicles). The first technical paper to explain the difference in vehicle characteristics between PAVs and existing General Aviation single engine piston aircraft was "Personal Air Vehicles: A Rural/Regional and Intra-Urban On-Demand Transportation System" by Mark D. Moore (the NASA PAV Sector Manager) from NASA Langley Research Center.