The Blackburn B-54 and B-88 were prototype carrier-borne Anti-submarine warfare aircraft of the immediate post Second World War-era developed for the Royal Navy's Fleet Air Arm (FAA). They shared a conventional monoplane design with a mid-mounted inverted-gull wing and tricycle undercarriage. The pilot and observer sat in tandem under a long canopy atop the fuselage. The B-54 had a piston engine and the B-88 a gas turbine driving a large contra-rotating propeller. The radar scanner was mounted in a retractable radome in the rear fuselage, behind a long internal weapons bay. The program was cancelled in favour of the Fairey Gannet aircraft.