Built to Air Ministry Spec F7/30, this was the first aircraft to carry the name Spitfire. A gull winged monoplane with a fixed landing gear in “trouser” fairings, it was powered by a Rolls Royce Goshawk engine of some 600 horsepower and carried 4 machine guns. The Air Ministry contract went to the Gladiator from the Gloster Aircraft Company (The RAF’s last biplane fighter). Supermarine’s designer decided to develop a much more advanced design.