Ferrari 643 F1 91
Ferrari's 643 chassis was officially named the F1-91, but it was really only introduced in the 1991 French Grand Prix. It was not an entirely different car but instead a development of the 642 chassis. A host of changed had been made nonetheless, including a longer wheel base and longer flanks with straight central sections. The suspension design remained unchanged with a push-rod spring action system, torsion bars vertical to the front axle and helicoid springs on the rear axle, but many elements were redesigned to vary the geometries. The engine still had five valves per cylinder as pneumatic springs had not yet been developed and the intake trumpet adjustment system was only introduced at the end of the season.
It soon proved not to be up to Ferrari's expectations though, despite a second place finish by Prost at its debut. Reliability problems did not get resolved and the car was no match against the McLaren MP4/6 or the Williams FW14. The situation got worse enough that Alain Prost even said it would be easier to drive a tank than this car. This led to Prost being sacked from Ferrari one race from the end of the season. Ferrari's test driver Gianni Morbidelli then ran the final race of that year alongside Jean Alesi.
The car scored 39.5 points of the teams 55.5 points in 1991 with 8 podiums and finished 3rd in the constructors championship.
The end of the season also saw Luca di Montezemolo return to Maranello as President and CEO of Ferrari.
Chassis: Monocoque in composite: carbon-fibre and Kevlar honeycomb
Length: 4,400 mm
Designation: Ferrari Tipo 037
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