The Blackburn T.5 Ripon was a carrier-based torpedo bomber and reconnaissance biplane designed and produced by the British aircraft manufacturer Blackburn Aircraft. It was the basis for both the license-produced Mitsubishi B2M and the improved Blackburn Baffin. The Ripon was designed as a successor to the Blackburn Dart torpedo bomber as well as a long-range reconnaissance aircraft to fulfil Air Ministry Specification 21/23. The first prototype made its maiden flight on 17 April 1926, it was subsequently redesigned with a more effective engine installation, an enlarged rudder and increased wing sweepback. It was originally ordered into production for the Fleet Air Arm (FAA), which primarily operated the type as a torpedo bomber. The Ripon was operated by the FAA between 1930 and 1935, after which point it was withdrawn in favour of the Blackburn Baffin, which was an improved derivative of the Ripon. It was also produced overseas in Finland; many of the Ripons in service with the Finnish Air Force saw extensive use in both the Winter War and the Continuation War, typically flying nighttime reconnaissance missions. Development Background The origins of the Ripon can be traced back to the mid-1920s and the issuing of Air Ministry Specification 21/23, which sought a replacement for the Fleet Air Arm's (FAA) single-seat Dart that could operate both as a torpedo bomber and an reconnaissance aircraft. It was stipulated that it should have a two-man crew, comprising a pilot and navigator/gunner to facilitate long-range reconnaissance missions; for the same reason, the aircraft was to have a maximum endurance of at least 12 hours. A further requirement was that it should have an interchangeable undercarriage between wheeled and float-equipped configurations, facilitating its operation from both land and sea. Blackburn begin work on its response to the specification during 1925, directed by F. A. Bumpus. The resulting aircraft, which was designed around the Napier Lion V engine, drew heavily on the preceding Blackburn Velos coastal defence seaplane, having a broadly similar structure with the exception of its use of single-bay wings and the anhedral on the bottom central section. The lower mainplane was of a slightly larger span than the lower, while an atypical feature in the form of a lower wing root fairing. A single Lewis gun fitted on a rotating mounting around the rear cockpit formed the defensive armament. Offensive armaments consisted of six 230lb bombs, or three 520lb bombs, or a