The Vickers Virginia was a biplane heavy bomber of the British Royal Air Force, developed from the Vickers Vimy. Design and development Work on the Virginia was started in 1920, as a replacement for the Vimy. Two prototypes were ordered on 13 January 1921 and another two prototypes were ordered in September 1922. The Virginia was similar to the Vimy but notably had a lowered front gunner's pulpit to allow the pilot a greater field of view, 20 ft (6 m) greater wingspan and a 9 ft (3 m) longer fuselage. The aircraft was powered by twin Napier Lion engines and flew for the first time on 24 November 1922. At the Aircraft Experimental Establishment at RAF Martlesham Heath, the Virginia prototype underwent type trials. One of the first modifications was to replace the original two-bladed propellers with four-bladed propellers. An unusual set of "fighting top" turrets were added to the top wings, but these were later deleted from production aircraft. Marks I–VI had straight wings and the Mark VII introduced swept outer wings. Starting with the Mark III the Virginia mounted a rear fuselage gunner, who was moved into a tail turret in the Mark VII. The Mark X was introduced in late 1924 and featured a duralumin and steel structure covered in fabric, aluminium, and wood. A total of 124 Virginias were built, of which 50 were Mark Xs. Operational history The first squadron of Virginia Mark Is was formed in 1924. Despite mediocre performance, the aircraft served frontline units until 1938, when it was replaced by the newer Wellingtons, Hampdens and Whitleys. Designs such as the Fairey Hendon and Handley Page Heyford supplemented rather than replaced the Virginia. The final almost all-metal Virginia Mark X was the most numerous RAF bomber until the Heyford in 1934. After its technical obsolescence as a bomber it was used for photography and for parachute training, with jump platforms installed behind the engine nacelles. On 26 June 1940, a committee discussing the need for airborne cannon for use against invading tanks suggested equipping Virginias with the equally antiquated COW 37 mm gun (1.46 in Coventry Ordnance Works gun). This was not acted on. In the 1930s, the Virginias were used in some of the first tests of inflight refueling, although they were never used outside of tests. The Virginia was developed in parallel with the Vickers Victoria freighter and the two