Bristol Blenheim

Aircraft name
Bristol Blenheim
Description
Role	Three-seat light bomber
Crew
Dimensions
Length		12.98 m
Wingspan		17.17 m
Height		3.00 m
Wing area		43.57 m²
Weights
Empty		4,441 kg
Loaded
Maximum take-off		6,532 kg
Powerplant
Engines	2 Bristol Mercury XV radial piston engines
Power
Performance
Maximum speed		428 km/h
Combat range
Ferry range
Service ceiling		8,310 m
Rate of climb
Armament
Guns	5 7.7 mm
Bombs		599 kg

The Blenheim was a high-speed light bomber used extensively in the early days of WWII, 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 860hp 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 .303 in a semi-retracting dorsal turret firing to the rear. A 1,000lb 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 Finland and Yugoslavia. Other countries bought it outright, including Romania, Greece, and Turkey. Total production in England amounted to 1,351 Mk.I's.

Work on an extended range reconnaissance version started as the Mk.II, which increased tankage from 278 gallons to 468, 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 905hp 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.

Bristol Blenheim, England, 2001. Larger version

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 950hp. 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.

Units Using the Blenheim

Royal Air Force

• No. 6 Squadron
• No. 8 Squadron
• No. 11 Squadron
• No. 13 Squadron
• No. 14 Squadron
• No. 15 Squadron
• No. 18 Squadron
• No. 21 Squadron
• No. 23 Squadron
• No. 25 Squadron
• No. 27 Squadron
• No. 29 Squadron
• No. 30 Squadron
• No. 34 Squadron
• No. 35 Squadron
• No. 39 Squadron
• No. 40 Squadron
• No. 42 Squadron
• No. 44 Squadron
• No. 45 Squadron
• No. 52 Squadron
• No. 53 Squadron
• No. 55 Squadron
• No. 57 Squadron
• No. 59 Squadron
• No. 60 Squadron
• No. 61 Squadron
• No. 62 Squadron
• No. 64 Squadron
• No. 68 Squadron
• No. 82 Squadron
• No. 84 Squadron
• No. 86 Squadron
• No. 88 Squadron
• No. 90 Squadron
• No. 92 Squadron
• No. 101 Squadron
• No. 104 Squadron
• No. 105 Squadron
• No. 107 Squadron
• No. 108 Squadron
• No. 110 Squadron
• No. 113 Squadron
• No. 114 Squadron
• No. 139 Squadron
• No. 140 Squadron
• No. 141 Squadron
• No. 143 Squadron
• No. 144 Squadron
• No. 145 Squadron
• No. 162 Squadron
• No. 173 Squadron
• No. 203 Squadron
• No. 211 Squadron
• No. 212 Squadron
• No. 218 Squadron
• No. 219 Squadron
• No. 222 Squadron
• No. 223 Squadron
• No. 226 Squadron
• No. 229 Squadron
• No. 233 Squadron
• No. 234 Squadron
• No. 235 Squadron
• No. 236 Squadron
• No. 242 Squadron
• No. 244 Squadron
• No. 245 Squadron
• No. 248 Squadron
• No. 252 Squadron
• No. 254 Squadron
• No. 267 Squadron
• No. 272 Squadron
• No. 285 Squadron
• No. 287 Squadron
• No. 288 Squadron
• No. 289 Squadron
• No. 404 Squadron
• No. 406 Squadron
• No. 407 Squadron
• No. 454 Squadron
• No. 459 Squadron
• No. 489 Squadron
• No. 500 Squadron
• No. 516 Squadron
• No. 521 Squadron
• No. 526 Squadron
• No. 527 Squadron
• No. 528 Squadron
• No. 600 Squadron
• No. 601 Squadron
• No. 604 Squadron
• No. 608 Squadron
• No. 614 Squadron

Fleet Air Arm

• No. 748 Squadron
• No. 759 Squadron
• No. 762 Squadron
• No. 770 Squadron
• No. 771 Squadron
• No. 772 Squadron
• No. 775 Squadron
• No. 776 Squadron
• No. 780 Squadron
• No. 787 Squadron
• No. 788 Squadron
• No. 798 Squadron

External links

Bristol Blenheim / Bolingbroke

Bristol 142M, 149, and 160 Blenheim

Referenced By