Crew of  3
Span 56ft 4ins
 Length 42ft9ins
 Height 12ft 10 ins
 Engines Two 920 h.p. Bristol Mercury XVI radials
 Maximum speed 266mph. at 11,800 ft
Armament Five .303 Browning machine guns
1,000 lb bomb load
Normal range 1,950 miles (maximum)
Service ceiling  31,500
 Weight empty 9,8001b
 Weight loaded 14,400 lb

The Blenheim was a light/medium bomber remarkable for its speed. The maximum speed of the original Blenheim I was 285 m.p.h. which was quicker than the pre-war fighters. The Blenheim was an all-metal monoplane of stressed-skin structure, powered by two Bristol Mercury radial engines. The three-crew bomber was defended by armaments of one .303 Browning machine gun and a Vickers K gun sited in a half-revolvable dorsal turret. As a bomber it could carry up to 1,000 lb of weapons.
The Blenheim I was modified for service as a night-fighter.. An extra pack of four Browning machine guns were fitted beneath the bomb-bay position and an airborne interception radar was also added. The stub-nosed bomber helped defend against enemy night attacks following the Battle of Britain it flew not only from Britain, but also in the Western Desert. The Blenheim IV was built with more powerful engines Bristol Mercury XV radials of 920 h.p., compared to the Mercury VIII at 840 h.p. Altogether 1,930 Blenheim IVs were produced.

No 23 Squadron
No 25 Squadron
No 29 Squadron
No 219 Squadron
No 235 Squadron
No 236 Squadron
No 600 Squadron
 No 604 Squadron
It was one of the most commonly used light bomber of the Royal Air Force (RAF) during the WW II. It was the military version of a light twin-engined transport aircraft. This aircraft was, in Lord Rothermere's intentions, the faster transport aircraft all around the world. In fact, the Bristol Type 142 reached 495 km/h during test flights. It was faster than all other fighters used by RAF, during that period. Unfortunately the military version was not so successful in particular referring to defensive armaments, 1 Browning gun-machine on wing mounting and 1 Vickers Type K on a dorsal turret. The first flight was made on April, 12th 1935 and the number of Blenheim's built during the war totaled 5500.
The Bristol Blenheim Mk I was an all metal, cantilevered wing, twin engined with retractable landing gear. It was powered by two Bristol Mercury VIII radial 9 engines, air cooled, 840 HP each.
Its first operational flight was on January 1937, but showed a great inferiority toward German fighters and so it was used on Mediterranean and African fronts.
The second production version, Mk IV, was powered by 2 Bristol Mercury XV radial 9 engines, air cooled, 920 HP each and it was lengthened of 860 mm. The defensive armaments was greatly increased: 5 machine guns.
On September, 3rd 1939, one Bristol Blenheim Mk IV flew the first operative reconnaissance mission of the war, within German airspace.
On August 1942 they were replaced by Douglas Boston and de Havilland Mosquito. Engine: 2 Bristol Mercury VIII 618 KW each, Wing span: 17.17 m, Length: 12.12 m, Wing surface: 85 sqm, Take off weight: 55.62 KN, Max. speed: 428 km/h (3600 m), Operative ceiling: 8315 m, Range: 1810 km.


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