McLaren introduced the first carbon-fibre monocoque to race in Formula One with the 1981 MP4/1.
Designed chiefly by John Barnard with contributions from Steve Nichols and Alan Jenkins, the MP4/1 replaced the conventional aluminium-based structure with a lightweight, exceptionally stiff carbon-fibre composite monocoque. McLaren worked with Hercules Aerospace in the United States because the necessary manufacturing expertise and autoclave facilities were not readily available in Britain.
The Lotus 88 is the main source of confusion. Lotus’s car appeared earlier at the 1981 United States Grand Prix West and used a carbon-fibre composite chassis, but officials banned it from racing that weekend. McLaren’s MP4/1 therefore became the first carbon-fibre monocoque car to actually compete in a Grand Prix.
The design’s safety benefits became dramatically visible after John Watson’s major crash at Monza in 1981. The monocoque remained substantially intact while the car broke apart around it, helping convince sceptics that carbon fibre could protect drivers as well as improve stiffness and reduce weight. The technology soon became standard across F1.