Full Documentary of the Racing Life of Colin Chapman. Improved Audio|Video!
Colin Chapman pioneered the use of struts as a rear suspension device. Even today, struts used in the rear of a vehicle are known as Chapman struts, while virtually identical suspension struts for the front are known as MacPherson struts that were invented 10 years earlier in 1949.
Chapman's next major innovation was popularising monocoque chassis construction within automobile racing, with the revolutionary 1962 Lotus 25 Formula One car. The technique resulted in a body that was both lighter and stronger, and also provided better driver protection in the event of a crash. Although a previously little-used concept in the world of motorsport, the first vehicle to feature such a chassis was the road-going 1922 Lancia Lambda. Lotus had been an early adopter of this technology with the 1958 Lotus Elite. The modified monocoque body of the car was made of fibreglass.
When American Formula One driver Dan Gurney first saw the Lotus 25 at the Dutch Grand Prix at Zandvoort, he was so struck by the advanced design that he invited Chapman to the 1962 Indianapolis 500, where Gurney made his Indy début at the wheel of a space-frame rear engined car designed by John Crosthwaite (who had previously worked for Chapman) and built by American hot-rodder Mickey Thompson. Following the race, Chapman prepared a proposal to Ford Motor Company for an aluminium monocoque Indianapolis car using a 4.2-litre aluminium V-8 Ford passenger car engine. Ford accepted the proposal. The Lotus 29 debuted at Indianapolis in 1963, with Jim Clark finishing second. This design concept fairly quickly replaced what had been for many decades the standard design formula in racing-cars, the tube-frame chassis. Although the material has changed from sheet aluminium to carbon fibre, this remains today the standard technique for building top-level racing cars.
Inspired by Jim Hall, Chapman was among those who helped introduce aerodynamics into Formula One car design. Lotus used the concept of positive aerodynamic downforce, through the addition of wings, at a Tasman Formula race in early 1968, although Ferrari and Brabham were the first to use them in a Formula One race at the 1968 Belgian Grand Prix. Early versions, in 1968 and 1969, were mounted 3 feet (0.91 m) or so above the car, to operate in 'clean air' (air that would not otherwise be disturbed by the passage of the car). The under designed wings and struts failed regularly, however, compelling the FIA to require the wing mounting hardware to be attached directly to the sprung chassis. Chapman also originated the movement of radiators away from the front of the car to the sides, to decrease frontal area (lowering aerodynamic drag) and centralising weight distribution.
Chapman was also an innovator in the business end of racing. He was among the first entrants in Formula One to turn their cars into rolling billboards for non-automotive products, initially with the cigarette brands Gold Leaf and, most famously, John Player Special.
Chapman, working with Tony Rudd and Peter Wright, pioneered the first Formula One use of "ground effect", where a low pressure was created under the car by use of venturis, generating suction (downforce) which held it securely to the road whilst cornering. Early designs utilized sliding "skirts" which made contact with the ground to keep the area of low pressure isolated.
Chapman and his lead driver, Mario Andretti, pictured during their double World Championship-winning 1978 season with the ground effect Lotus 79. Chapman next planned a car that generated all of its downforce through ground effect, eliminating the need for wings and the resulting drag that reduces a car's speed. The culmination of his efforts, the Lotus 79, dominated the 1978 championship. However, skirts were eventually banned because they were susceptible to damage, for example from driving over a kerb, whereafter downforce would be lost and the car could then become unstable. The FIA made moves to eliminate ground effect in Formula One by raising the minimum ride height of the cars from 1981 and requiring flat bottom cars from 1983. Car designers have managed to claw back much of that downforce through other means, aided by extensive wind tunnel testing.
One of his last major technical innovations was a dual-chassis Formula One car, the Lotus 88 in 1981. For ground effect of that era to function most efficiently, the aerodynamic surfaces needed to be precisely located and this led to the chassis being very stiffly sprung. However, this was very punishing to the driver, resulting in driver fatigue. To get around this, Chapman introduced a car with two chassis. One chassis (where the driver would sit) was softly sprung. The other chassis (where the skirts and such were located) was stiffly sprung.
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