9 Days in Summer is a promotional documentary film made by Ford that tells the story of the development of the Ford-funded Cosworth DFV and Lotus 49, the title coming from the nine Formula One races the car took part in 1967, which are also extensively featured in the film.
The Lotus 16 was the second single-seat racing car designed by Colin Chapman, and was built by his Lotus Cars manufacturing company for the Team Lotus racing squad.
 The Lotus 16 was constructed to compete in both the Formula One and Formula Two categories, and was the first Lotus car to be constructed for Formula One competition.
 Its design carried over many technological features of the first Lotus single-seater, the Lotus 12, as well as incorporating ideas which Chapman had been developing while working on the Vanwall racing cars.
 Indeed, such was the visual similarity between the Vanwall and Lotus 16 designs that the Lotus was often dubbed the ""mini Vanwall"" by the contemporary motor sport press.
 Although the Lotus 16 only scored five Formula One World Championship points in the three seasons during which it was used, its raw pace pointed the way for its more successful successors, the Lotus 18 and 21.
The 1968 Tasman Series was the fifth Tasman Series season.
 It began on 6 January 1968 and ended on 4 March after eight races.
 It was won by Jim Clark, driving a Lotus 49T.
John Wall (born 1932 in Crayford, Kent) is an English design engineer, amateur astronomer, amateur telescope maker and member of the British Astronomical Association, now living Coventry England.
Colin Chapman (1928–1982) was an English design engineer, inventor, and builder in the automotive industry, and founder of Lotus Cars.
The Lotus 49 was a Formula One racing car designed by Colin Chapman and Maurice Philippe for the 1967 F1 season.
 It was designed around the Cosworth DFV engine that would power most of the Formula One grid through the 1970s.
 It used its drivetrain as a stressed member, being not the first F1 car to do so, but the first to apply the technique so well that all other teams copied it.
The Lotus 63 was an experimental Formula One car, designed by Colin Chapman and Maurice Philippe for the 1969 season.
 Chapman's reasoning behind the car was that the 3 litre engines introduced in 1966 would be better served by building a car that could take full advantage of its power while retaining the Lotus 49's simplicity.
The 1970 Monaco Grand Prix was a Formula One motor race held at the Circuit de Monaco on May 10, 1970.
 It was race 3 of 13 in both the 1970 World Championship of Drivers and the 1970 International Cup for Formula One Manufacturers.
 Jochen Rindt scored the last victory for the famous Lotus 49.
The Lotus 91 was a car used by the English team Lotus in the 1982 Formula One season, designed by Colin Chapman, Martin Ogilvie and Tony Rudd.
 After several uncompetitive seasons with experimental or mediocre cars, Colin Chapman went back to basics and designed the graceful Lotus 91, based in part on the Williams FW07 and Lotus' own 88 design.
 Powered by the Ford Cosworth DFV, and using a standard Hewland gearbox, the 91 was uncomplicated and easy to maintain.
 Following Brabham's lead, the new car was the first Lotus chassis to use carbon brakes, improving braking performance considerably.
Anthony Colin Bruce Chapman CBE (19 May 1928 – 16 December 1982) was an influential English design engineer, inventor, and builder in the automotive industry, and founder of Lotus Cars.

Question: What influential English design engineer designed the Lotus 49?
Answer: Colin Chapman