A projected two-seat biplane, powered by a Rolls-Royce Kestrel FXI, to Specification O22/26, which called for a high performance Fleet spotter/reconnaissance machine. All-up weight 3,900 lb. The Hawker proposal to this specification led directly to the Osprey. Other prototypes built to this specification were the Fairey Fleetwing, Blackburn Nautilus and Short Gurnard.