Cosworth tried to design a full Formula One Grand Prix car in 1969. The car was designed by Robin Herd. It used a new design of a 4WD transmission designed by Keith Duckworth. This transmission was different from the Ferguson transmission used by all other 4WD F1 cars of the 1960s. It was powered by a version of the DFV engine built out of magnesium. The plan was to drive the car at the British Grand Prix. Cosworth withdrew the car without any explanation. Herd left Cosworth to form March Engineering. The F1 car project was canceled. The external design of the car was Herd's use of Mallite sheeting. Mallite is a product made from layers of wood and aluminum. The Mallite was for the main structural monocoque (car body) sections. This is a procedure he developed on the first McLaren single-seat race cars, including the McLaren M2B of 1966.