Driven by Jackie Stewart, the Tyrrell 003 debuted at the 1971 Spanish Grand Prix and won at the first attempt. Owners Ken Tyrrell and Jackie Stewart took advantage as Lotus and Ferrari struggled during 1971; they won six races with Stewart claiming his second World Championship. Designed by Derek Gardner, the project, codenamed "SP" which meant "Special Project", cost Tyrrell over £22,000 of his own money. The resulting car named Tyrrell 001 made its debut at Oulton Park at a non-championship race. After the season had finished Gardner redesigned some sections of the car, altering the airbox, remodelling the nose section, lengthening the wheelbase and slightly narrowing the monocoque. The redesigned car became known as the 002 and 003, which were chassis numbers given to each of the cars made for the 1971 season. Tyrrell 003 remains the Tyrrell team's most successful car being one of the most Grand Prix winning chassis in Formula One history.