Legend Team #6 JPS Lotus 78
JPS Lotus 79 – 1978
Driver : Mario Andretti
Ronnie Peterson
Chairman: Colin Chapman
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The Lotus 79 was the first F1 car to take full advantage of ground effects aerodynamics, pioneered in its immediate predecessor, the Lotus 78. The undercar pressure problems in the 78 were resolved with the 79, with further design work on the venturi tunnels under the car, which allowed the low pressure area to be evenly spaced along the whole of the underside. This was achieved by extending the rear bodywork to a point inside the rear wheels, allowing the underside to extend further back, instead of ending abruptly in front of the rear wheels as on the 78. As a result, the rear suspension was also redesigned to allow the air to exit the rear more cleanly than on its predecessor. This allowed a smaller rear wing to be designed, causing less drag. When the car first appeared, the upper bodywork was steeply raked and featured "Coke bottle" sidepods. After work in the wind tunnel, these features were found to be unnecessary, as the car generated so much downforce anyway. These features were, however, later incorporated into the Lotus 80. In all, five chassis were built during the design’s lifetime, with the prototype 79/1 being sold to Héctor Rebaque to race as a privateer entrant.
The car was powered by the Ford Cosworth DFV and constructed of sheet aluminium honeycomb, specially strengthened for the pressures exerted on the car by the ground effect. The fuel tank was one single cell behind the driver, as opposed to separate fuel tanks as on the 78. This had the advantage of increasing fire protection and moving the centre of gravity to the middle of the car, helping cornering and braking. The 79 was also the first F1 car to be designed using computer design aids.[citation needed] In fact, it was the first F1 car to use computers to analyse it in the pits on race weekends.
The car was secretly tested in late 1977 by Ronnie Peterson and proved extremely fast, but the chassis suffered early fatigue due to the severe suction and g-forces generated by the ground effect. The 79 produced about 30% more downforce than the 78, something not foreseen by Ogilvie and Rudd, who went back to the drawing board. The chassis was strengthened in specific points, mostly around the monocoque and load bearing points on the chassis tub, and the car was found to be even faster than before.
The need for smooth airflow dictated the car must have clean lines. Nicknamed "Black Beauty" by the press and F1 fans alike, for its graceful design and sleek profile and its black and gold livery through sponsorship by John Player Special cigarettes, the Lotus 79 was instantly competitive on its debut, the 1978 Belgian Grand Prix at Zolder. It took pole at the hands of Mario Andretti by more than a second, and won the race comfortably. Andretti said after driving the 79 for the first time that the Lotus 78 was like driving a London bus. Peterson once quipped, after scoring an impressive pole position, that the car was so brilliantly set up, all he had to do was steer.
The 79 was not without its problems, however. Wright and Ogilvie noted that the car was very marginal in some aspects of its design. Andretti had reservations over the car’s brakes, which faded noticeably over a race distance, especially in hot conditions; the exhaust had a tendency to overheat, and the monocoque tub was not as stiff as the team would have liked, which meant a new casting had to be fabricated several times during the two seasons the car was used.
