Tyrrell and Zakspeed from 1984-87. Schlesser drove in what would be the only World Championship F1 race of his career. He had previously driven a RAM-Ford to 6th in the non-championship 1983 Race of Champions, then unsuccessfully tried to qualify the car a week later for the French Grand Prix and had not driven an F1 car since. Despite a long and successful career which has included twice winning the Paris-Dakar Rally, Schlesser will forever be remembered for his drive at Monza, as it was his clash on lap 49 of 51 with race leader Ayrton Senna in the McLaren-Honda at the Variante de Rettifilio chicane which took Senna out of the race. This was McLaren's only loss of the season, and handed Ferrari's Gerhard Berger and Michele Alboreto an emotional 1-2 result only a month after the death of Enzo Ferrari. The FW12 proved competitive for Williams in the last few races of the 1988 season. Despite both Mansell and Patrese retiring from the Portuguese Grand Prix (Round 13), better was to come at the next race in Spain with Mansell finishing 2nd behind the McLaren of Alain Prost, while Patrese finished 5th (the race was also Mansell's second and only point scoring race for the season after finishing runner up in both and ). Mansell was then to retire from the last two races of the season in both Japan (accident with the Lotus of Nelson Piquet) and Australia (brake failure), ending his first run with the team after four seasons and 13 wins, while Patrese would finish 6th and 4th in both races. After winning the Formula One Constructors' Championships in both 1986 and 1987 and the Drivers' Championship with Piquet in 1987, Williams dropped to 7th in the standings in 1988, scoring only 20 points for the season in a year when the Honda powered McLaren MP4/4's of 1988 World Champion Ayrton Senna and his team mate, dual World Champion Alain Prost, won 15 of the season's 16 races in the single most dominant season in Formula One history. FW12C During the 1988 season, Williams worked with their new engine supplier Renault to develop the RS1 3.5 V10 engine. Williams designed a test mule for the engine named FW12B, very much like the Judd-powered car Williams used for the 1988 season except the mule was designed to accommodate the extra length of a V10 engine and