Supermarine’s replacement for the Spitfire was very similar in lines to the later Spitfires. It had an all-new wing with straight leading and trailing edges and a wide-track inward retracting undercarriage. An armament of four cannon was carried. The Spiteful showed no large improvement in performance over the later Spitfires and the new jet technologies promised to make it obsolete so only 17 were produced. In trials a top speed in level flight of 494 mph was reached. The wing design of the Spiteful was later used in the Supermarine Attacker naval jet fighter.