 Complete the following phrase:  Rindt started motor racing in 1961. Switching to single-seaters in 1963, he was successful in both Formula Junior and Formula Two. In , Rindt made his debut in Formula One at the Austrian Grand Prix, before securing a full drive with Cooper for . After mixed results with the team, he moved to Brabham for and then Lotus in . It was at Lotus that Rindt found a competitive car, although he was often concerned about the safety of the notoriously unreliable Lotus vehicles. He won his first Formula One race at the 