 Complete the following phrase:  Taking cues from Brabhams Formula One special, and through evolution of the Formula Three curved tube chassis design, Maddock produced a new Formula Two design for 1956: the Cooper T41. He developed this the subsequent year into the Mark II, or Cooper T43, model. Where the 1956 car had been developed for Climaxs FWB, this 1957 car was intended for Climaxs new FPF four-cylinder engine. While the FWB was a development of a pump engine adapted for automobile use, the FPF was a bespoke, dry sumped racing design. Even in Formula Two form Maddocks lightweight cars could produce strong performances against more powerful machinery, but the true potential of the design was shown when Rob Walker Racing decided to build a T43 with an enlarged 1964 cc FPF engine  and the works entered it for the 