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The Bristol Type 142 Blenheim was a high-speed light bomber used extensively in the early days of World War II, built by Bristol Aeroplane Company.

The design had started as a civilian aircraft, a project of Lord Rothermere, owner of the Daily Mail. In order to promote British aviation, he asked the industry to deliver the fastest civilian aircraft in Europe, capable of carrying 6 passengers and 2 crew members. Bristol responded with the Type 142, and when it first flew as Britain First in 1934 it proved to be faster than any fighter the RAF had at the time.

Needless to say the Air Ministry was interested in such a plane for their own uses, and quickly sent out Specification B.28/35 for prototypes of a bomber version of the 142M (M for "military"). The main changes were to move the wing higher on the fuselage from its former low position, to allow room under the spar for a bomb-bay. The aircraft was all-metal with twin Bristol Mercury radial engines of 860 hp (640 kW) each. It carried a crew of three – pilot, navigator/bombardier and gunner/wireless operator – and was armed with a forward firing .303 machine-gun in the wing root and a 0.303 in (7.7 mm) in a semi-retracting dorsal turret firing to the rear. A 1,000 lb (450 kg) bomb load was carried in the internal bay.

The plane was ordered directly from the plans, and the first production model, known at the time as the Bolingbroke, served as the first and only prototype. The name then became Blenheim I, and deliveries started in 1937. The plane would prove to be so successful that it was licensed by a number of countries, including FinlandSuomen TasavaltaRepubliken Finland ( In Detail) ( In Detail) National motto: None Official languages Finnish and Swedish Capital Helsinki President Tarja Halonen Prime minister Matti Vanhanen Area Total % water Ranked 64th 337,030 km² 9. 4% Population Tot and YugoslaviaThe Kingdom of Yugoslavia was a Balkan state which existed from December 1, 1918 to mid-April 1941. History The kingdom was formed in 1918 under the name Kingdom of Serbs, Croats and Slovenes ( Serbo-Croatian Kraljevina Srba, Hrvata i Slovenaca Slovenian. Other countries bought it outright, including RomaniaRomania (formerly spelled Rumania or Roumania is a country in southeastern Europe. Romania is bordered by Ukraine and Moldova in the northeast, Hungary and Serbia in the west and Bulgaria to the south. Romania also has a small sea coast on the Black Sea., GreeceGreece formally called the Hellenic Republic (in Greek: ) Hellenike Demokratia , is a country in the southeast of Europe on the southern tip of the Balkan peninsula. It is bounded on land by Bulgaria, the Former Yugoslav Republic of Macedonia and Albania, and TurkeyTurkey (officially the Republic of Turkey Turkish Turkiye is a country located in Southwest Asia with a small part in southeastern Europe. Until 1922 the country was the center of the Ottoman Empire. The Anatolian peninsula, between the Black Sea and the. Total production in England amounted to 1,351 Mk.I's.

Work on an extended range reconnaissanceReconnaissance is the military term for methods of gathering information about an enemy. It is often referred to as recce (British) or recon (American). The associated verb is reconnoiter reconnoitre in British English). Examples of reconnaissance include version started as the Mk.II, which increased tankage from 278 to 468 gallons, but only one was completed. Another modification resulted in the Mk.III, which lengthened the nose to provide more room for the bombardier. This required the nose to be "scooped out" in front of the pilot to maintain visibility during takeoff and landing. However both of these modifications were instead combined, along with a newer version of the Mercury engine with 905 hp (675 kW) and a second gun in the rear cockpit, to create the Blenheim IV. When it was introduced in 1939, the Mk.IV (Type 149 to Bristol) was the fastest bomber in the world, and 3,307 would eventually be produced.

The longer range also lent itself to a Canadian need for a patrol bomber, and Fairchild started production there with the original name as the Bolingbroke. After a small run of British-like planes as the Mk.I, Fairchild switched production to the Mk.IV with American instruments and equipment. These versions also included anti-icing boots and a dinghy. Some of these planes served as bombers during the Aleutians campaign, but most of the 150 served in the intended role as patrol bombers on the Atlantic coast. Another 450 were completed as the Mk.IV-T as trainers, and saw extensive use in the Commonwealth Air Training Plan.

Another modification was attempted to create a heavy- fighter version, using a solid nose containing four more Browning machine-guns. Originally known as the Bisley, the production aircraft were renamed Blenheim V and featured a strengthened structure, pilot armour, interchangeable nose gun pack or bombardier position, and yet another new Mercury with 950 hp (710 kW). The Mk.V (Type 160) was used primarily in the Far East.

Blenheims operated widely in many combat roles until about 1943. By that point most fighters could carry similar bombloads at much higher speeds, the surviving examples when most were used for training. The Blenheim also served as the pattern for the Beaufort and, eventually, Beaufighter.