The Seafang was the Supermarine Spiteful in naval form. An order for 150 Seafangs was placed but only 10 production aircraft had been delivered when the programme was cancelled. The powerplant was a Griffon 89 engine driving a contra-prop although the initial batch used the Griffon 69 and a normal five-bladed airscrew. Armament was four 20mm cannon. Production 10.