The March 2-4-0 was an experimental six-wheeled Formula One racing car built by the March Engineering company of Bicester, UK. It was constructed in late 1976 and tested in early 1977. The car followed on from the successful use by Tyrrell Racing of a six-wheeled car, the Tyrrell P34, in Formula One racing. However, the engineering concept behind the 2-4-0 was quite different. At March Engineering in Bicester, designer Robin Herd had watched the P34 experiment closely and, by late 1976, had come to the conclusion that the 'four front wheels' concept might have been a blind alley. In his assessment, the improved aerodynamics at the front were largely negated by the rear tyres which at 24" (60 cm) diameter would still have accounted for 30 to 40% of the car's total drag. He also felt that with a modern rear wheel drive F1 car, the extra grip could be employed more usefully for the driven wheels. With this in mind, Herd drew up plans for a six-wheeled car with four driven wheels at the rear and all of the wheels the same 16" diameter. His theory was that with all six tyres the same size as the regular F1 front tyre, the car would not only be slimmer than normal F1 cars but would possess improved aerodynamic performance at the rear with much cleaner air passing over the wing. Four driven wheels would also mean better traction and, unlike the Tyrrell, there would be no problem with tyre development since the car would use exactly the same rubber as a conventional F1 car. Herd called this concept '2-4-0', following the Whyte notation used to describe railway rolling stock: two wheels leading, four driven wheels, zero trailing wheels.
