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Armstrong Whitworth Whitley
Variants

Whitley Mk I
Powered by 795 hp (593 kW) Armstrong Siddeley Tiger IX air-cooled radial engines: 34 built

Whitley Mk II
Powered by 920 hp (690 kW) two-stage supercharged Tiger VIII engines: 46 built

Whitley Mk III
Powered by Tiger VIII engines, retractable "dustbin" ventral turret fitted aft of the wing root armed with two .303 in (7.7 mm) machine guns, hydraulically operated bomb bay doors and ability to carry larger bombs: 80 built

Whitley Mk IV
Powered by 1,030 hp (770 kW) Rolls-Royce Merlin IV inline liquid-cooled engines, increased fuel capacity, extended bomb-aimer's transparency, produced from 1938: 33 built

Whitley Mk IVA
Powered by 1,145 hp (854 kW) Merlin X engines: seven built

Whitley Mk V
The main wartime production version based on the Mk IV, modified fins, leading edge de-icing, manually operated tail and retractable ventral turrets replaced with a Nash & Thompson powered turret equipped with four .303 in (7.7 mm) Browning machine guns, tail fuselage extended by 15 in (381 mm) to improve the field of fire. First flew in December 1938, production ceased in June 1943: 1,466 built

Whitley Mk VI
Proposed Pratt & Whitney- or Merlin XX-powered version: none built

Whitley Mk VII
Designed for service with Coastal Command and carried a sixth crew member, capable of longer-range flights (2,300 mi/3,700 km compared to the early version's 1,250 mi/2,011 km) having additional fuel tanks fitted in the bomb bay and fuselage, equipped with Air to Surface Vessel (ASV) radar for anti-shipping patrols with an additional four 'stickleback' dorsal radar masts and other antennae: 146 built


Sources:
Gunston, Bill - The Encyclodepia of the Worlds Combat aircraft, 1976, Chartwell Books, Inc., New York
Green, William - War Planes Of The Second World War - Fighters - Vol. 2, 1961, Hanover House, New York
Wikipedia

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