 Complete the following phrase:  For the 1976 Formula One season, Canadian Walter Wolf had bought 60 of the team Frank Williams Racing Cars, agreeing to keep on previous owner Williams as manager. However, Williams left the team before the start of the 1977 season to form his new team Williams Grand Prix Engineering. Having run a renamed Hesketh 308C in 1976, Wolf now needed to build his own car, recruiting a group of talented designers for the job, spearheaded by Harvey Postlethwaite, who had worked at Hesketh Racing. WR1 became the teams first self-constructed car and it made an instant impression when Scheckter won on its début at the 1977 Argentine Grand Prix. The South African would go on to win two additional races, the prestigious Monaco Grand Prix and the teams home race in Canada, all in the WR1 chassis. He eventually finished the Championship in second place. Overall, WR1 was the most successful of the three chassis used in 1977: it raced in ten of the 17 races, scoring all three wins and one fastest lap. Scheckter managed another fastest lap at the Japanese Grand Prix in WR3 and one pole position with WR2 at 