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Boulton & Paul Overstrand
The Boulton Paul P.75 Overstrand was the last of the twin-engine biplane medium bombers of the Royal Air Force, a series that had begun during the First World War with the likes of the Vickers Vimy and Handley Page Type O. The Overstrand saw brief service in the late 1930s and by the Second World War, only a few surviving aircraft remained in operation with training units.
==Design and development==
The Overstrand was a development of the Boulton Paul Sidestrand, which had first flown in 1928 and like the Sidestrand was named for a village in Norfolk, home also of Boulton Paul's Norwich factory. The Sidestrand was similar to its First World War predecessors, in that it had open cockpits and hand-operated machine-guns. Unlike its predecessors, the Sidestrand could fly at 140 mph (225 km/h) making operating the guns in exposed positions difficult, particularly in the nose.〔Winchester 2003, p. 11.〕〔Lewis 1967, p. 238.〕 The Overstrand was fitted with an enclosed and powered nose turret with a Lewis gun, the first RAF aircraft to have a power-operated turret. Rotation was by pneumatic motors, elevation and depression of the gun by hydraulic rams. The cockpit was also enclosed but the dorsal and ventral gun positions remained open, though shielded.
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