• From one of the world's premier performance marques • Three-cylinder air-cooled diesel engine • Mechanically and cosmetic restored by Jonny Orwin of Holmforth Following spells at the Austro-Daimler, Mercedes-Benz and Steyr companies, all of which benefited greatly from his monumental engineering prowess, Dr Ferdinand Porsche set up his own design consultancy in Stuttgart on 25th April 1931.

Dr Ing hc F Porsche KG's most celebrated of product of the 1930s was, of course, Hitler's 'People's Car - the Volkswagen - but the company was also active in other fields, literally so in the case of its tractor project.

A handful of prototypes was constructed prior to WW2, the first of which were powered by petrol engines, before Dr Porsche turned to diesel power, eventually developing a series of one-, two-, three- and four-cylinder air-cooled engines ranging in output from 14 to 55bhp.

An unusual feature of Porsche's tractor system (fitted to all models right up to the end of production) was...