One of the tractors could be from Porsche being. Theoretically. As a 12 hp classic car, air-cooled, with a top speed of 16.5 km/h. Ferdinand Porsche, a member of the NSDAP since 1937, allowed himself to be persuaded to develop tractors instead of just racing cars. Hitler wanted a people’s tractor for his Volkswagen. Porsche delivered because: If you can do asphalt, you can do it on the field. I thought so. Then came the war.