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The Avro Type 694 Lincoln was a British four-engined heavy bomber of the Second World War, first flying on 9 June 1944 and entering service in August 1945, too late to be used in action. The last piston-powered bomber built for the RAF, a total of 604 were built.
The Avro Lincoln was Roy Chadwick's development of the Avro Lancaster, built to the Air Ministry Specification B.14/43, having longer span, higher aspect ratio (10.30 compared with 8.02) wings with two-stage supercharged Rolls-Royce Merlin 85 engines, bigger fuselage with bigger fuel and bomb loads. As a result, it could fly higher and further than the Lancaster. The prototype Lincoln was assembled at Manchester's Ringway Airport and made its maiden flight from there on 9 June 1944.
The type was intended for use in the Second World War in the Far East as part of Tiger Force and was known initially as the Lancaster IV and V (the V having the Merlin 68A engines), but was renamed Lincoln I and II respectively.
The Lincoln became operational too late to serve with the Royal Air Force and Commonwealth air forces in World War II. One Lincoln pattern aircraft was completed in Canada by Victory Aircraft. No. 75 Squadron RNZAF re-equipped with the type but disbanded shortly after the end of the war. In the postwar Royal Air Force, the Lincoln equipped several bomber squadrons. Nearly 600 Lincolns were built to equip 29 RAF squadrons. Due to the lack of range they were partially replaced by Boeing Washingtons which could reach targets inside the Iron Curtain. They were phased out of use in the late 1950s, and were completely replaced by jet bombers by 1963.
The Lincoln was used in combat during the 1950s in Kenya against the Mau-Mau, and Malaya during the Malayan Emergency. One was shot down by a Russian MiG-15 in 1957 as it flew to Berlin on a training flight.
The type later served with Argentina and the Royal Australian Air Force. Argentinian models were used several times during its service in several military coups. From 1946- 1949, 73 Lincolns were built in Australia, the largest aircraft ever built there.
The RAAF heavily modified their aircraft in the 1950s for use in anti-submarine warfare, giving them a 6' 6" longer nose to house acoustic submarine detection gear and its operator, larger fuel tanks to give 13 hours endurance, and modifying the bomb bay to accept torpedoes. The "long-nose" variant, officially the Mk. 31, was particularly difficult to land at night, as the bomber used a tailwheel and the long nose obstructed the pilot's view of the runway. Only 20 were built.
The Avro Shackleton maritime patrol aircraft was derived from the Lincoln, as was the Tudor airliner, which used the wings of the Lincoln married to a new pressurized fuselage.
Two Lincoln IIs were operated by D. Napier & Son Ltd. for icing research from 1948 to 1962.
A transport conversion of the Lincoln II, using the streamlined nose and tail cones of the Lancastrian and a ventral cargo pannier, was known as the Avro 695 Lincolnian.
One Lincoln Freighter converted by Airflight Ltd was used on the Berlin Air Lift by Surrey Flying Services Ltd. In addition, one Argentine example was converted to a Lincolnian by Avro at Langar. Four Lincolnian conversions by Field Aircraft Services for use as meat haulers in Paraguay, were not delivered and subsequently scrapped.
Postwar, Lincolns were frequently employed as testbeds in new jet engine development. RF403, RE339/G and SX972 flew with a pair of Armstrong Siddeley Python turboprops outboard in place of the Merlins. SX972 was further modified to fly with a pair of Bristol Proteus turboprops. RA716/G had a similarly placed pair of Bristol Theseus turboprops and later also flew with Avon turbojets replacing the pair of turboprops. RE530 kept its Merlins but had a Napier Naiad turboprop in the nose. It later flew, bearing the civilian registration G-37-1, with a similarly placed Rolls-Royce Tyne which it displayed at the 1956 Society of British Aircraft Constructors (SBAC) show. SX973 had a Nomad turboprop installed in a similar nose-mounted installation. RA643 flew with a Bristol Phoebus turbojet in the bomb bay, and SX971 had an afterburning Rolls-Royce Derwent mounted ventrally.
Argentine Air Force, Royal Australian Air Force, Royal Canadian Air Force, Royal Air Force
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