 Sopwith won several races in the Sphinx Allard.Sopwith called his team Equipe Endeavour after his father's America's Cup racing yacht.In 1954 Sopwith decided to expand Equipe Endeavour with some friends and ordered cars from Coopers.From early 1954 to late 1955 Crosthwaite worked with John Cooper of Cooper Cars supervising production and final design of Equipe Endeavour sports cars on Sopwith’s behalf.