The brothers were even more enthusiastic about the car than the boat and like all of his projects, Campbell wanted "Bluebird CN7", to be the best of its type, a showcase of British engineering skills. The British motor industry, in the guise of Dunlop, BP, Smiths Industries, Lucas Automotive, Rubery Owen as well as many others, became heavily involved in the project to build the most advanced car the world had yet seen. CN7 was powered by a specially modified Bristol-Siddeley Proteus free-turbine engine of driving all four wheels. "Bluebird CN7" was designed to achieve 475–500 mph and was completed by the spring of 1960.