Sinclair C5 The C5 would be available initially by mail order at a cost of £399 and would subsequently be sold via high-street stores. Sinclair issued a glossy sales brochure characterising the vehicle as a part of an ongoing exercise in "cutting giants down to size, turning impersonal tyrants into personal servants". The brochure highlighted Sinclair's achievements in producing affordable pocket calculators, home computers, and pocket televisions and declared, "with the C5, Sinclair Vehicles puts personal, private transport back where it belongs – in the hands of the individual." The photographs accompanying the text showed housewives and teenagers driving the C5 to
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.