The first Cooper car to enter a Formula One Grand Prix was Harry Schell's Mark IV, fitted with an V-twin engine, at the 1950 Monaco Grand Prix. However, Maddock's contribution to this design was minor. Cooper's conventionally front-engined Cooper Bristol cars also contested a number of World Championship Grands Prix during the Championship's Formula Two years in and . Mike Hawthorn's notoriously rapid example took fourth place in the 1952 Belgian Grand Prix to earn the first world championship points for Cooper, and third place in the 1952 British Grand Prix. The design of the Cooper Bristol was largely based on that of the Mark V Formula Three car, though, with Maddock principally acting as a draughtsman.