Lotus 25

The Lotus 25 was a racing car designed by Colin Chapman for the 1962 Formula One season. It was a revolutionary design, the first fully stressed monocoque chassis to appear in Formula One. In the hands of Jim Clark it took 14 World Championship Grand Prix wins and propelled him to his 1963 World Championship title. Its last World Championship win was at the 1965 French Grand Prix. It was the first Formula One car to use Esso fuel. An early brainchild of Chapman's fertile mind, the original sketches for the car were made on napkins while Chapman discussed his idea while dining out with Frank Costin (designer of Vanwall, Lotus Mk.8, 9, 10, 11 and Lotus 16 bodies, later of Marcos fame). The unveiling of the 25 at Zandvoort in 1962 was a shock for the competition, and particularly for teams like Brabham and UDT/Laystall who had recently purchased 24s from Lotus, with the understanding that they would be "mechanically identical" to the works cars - Chapman reserved the right to alter the bodywork of the cars. The monocoque made the car more rigid and structurally stronger than typical F1 cars of the period. The 25 was three times stiffer than the interim 24, while the chassis weighed only half as much. The car also was extremely low and narrow, with a frontal area of 8 sq ft (0.74 square metres) as compared to the normal 9.5 sq ft (0.88 square metres).