The Seafire FR.47 was the last variant of the classic R J Mitchell / J Smith fighter, with very little remaining of the Supermarine Type 300. The elliptical wing had been considerably modified and the Griffon engine with a six-bladed contra-rotating propeller had replaced the Merlin. The contrast from the Spitfire Mk I was vast, the Seafire FR 47 had twice as much power, a speed increase from 355mph to 451mph and a threefold increase in firepower.