(Types 142M, 149, 160)
|Blenheim Mk IV being maintained, Middle East, c. 1942|
|Role||Light bomber / fighter|
|Manufacturer||Bristol Aeroplane Company|
|First flight||12 April 1935|
|Retired||1944 (United Kingdom) |
|Primary users||Royal Air Force|
Royal Canadian Air Force
Finnish Air Force
Royal Yugoslav Air Force
|Variants||Bristol Beaufort |
Bristol Fairchild Bolingbroke
It was adapted as an interim long-range and night fighter, pending the availability of the Beaufighter. It was one of the first British aircraft to have all-metal stressed-skin construction, to utilise retractable landing gear, flaps, powered gun turret and variable pitch propellers. A Canadian-built variant named the Bolingbroke was used as an anti-submarine and training aircraft.
The Blenheim Mk I outshone most biplane fighters in the late 1930s but stood little chance against the German Messerschmitt Bf 109 during daylight operations, though it proved successful as a night fighter. The Mark IV variant was equally unsuccessful in its daylight bombing role, suffering major losses in the early stages of the war.
- 1 Design and development
- 2 Operational history
- 3 Variants
- 4 Operators
- 5 Survivors
- 6 Specifications (Blenheim Mk IV)
- 7 See also
- 8 References
- 9 External links
Design and development
In 1934, Lord Rothermere, owner of the Daily Mail newspaper, challenged the British aviation industry to build a high-speed aircraft capable of carrying six passengers and two crew members. At the time, German firms were producing a variety of record-breaking high-speed designs, such as the Heinkel He 70, and Rothermere wanted to recapture the title of fastest civilian aircraft in Europe. Bristol had been working on a suitable design as the 'Type 135' since July 1933, and further adapted it to produce the Type 142 to meet Rothermere's requirements.
Named 'Britain First', this first flew at Filton on 12 April 1935, and proved to be faster than any fighter in service with the Royal Air Force at the time. The Air Ministry was obviously interested in such an aircraft and quickly sent out Specification B.28/35 for prototypes of a bomber version; the 'Type 142M' (M for military). The main change was to move the wing from a low-wing to a mid-wing position, allowing room under the main spar for a bomb bay. The aircraft was all-metal with two Bristol Mercury VIII air-cooled radial engines, each of 860 hp (640 kW). It carried a crew of three - pilot, navigator/bombardier and telegraphist/air gunner. Armament comprised a single forward-firing .303 in (7.7 mm) Browning machine gun outboard of the port engine and a .303 in (7.7 mm) Lewis Gun in a semi-retracting Bristol Type B Mk I dorsal turret firing to the rear. From 1939 onwards, the Lewis gun was replaced by the more modern .303 in (7.7 mm) Vickers VGO machine gun of the same calibre. A 1,000 lb (450 kg) bomb load could be carried in the internal bay.
To achieve its relatively high speed, the Blenheim had a very small fuselage cross-section, with its upper front glazing all at one angle in the form of a "stepless cockpit", that used no separate windscreen panels for the pilot. Pilot's quarters on the left side of the nose were so cramped that the control yoke obscured all flight instruments while engine instruments eliminated the forward view on landings. Most secondary instruments were arranged along the left side of the cockpit, with essential items like propeller pitch control actually placed behind the pilot where they had to be operated by feel alone. Like most contemporary British aircraft, the bomb bay doors were kept closed with bungee cords and opened under the weight of the released bombs. Because there was no way to predict how long it would take for the bombs to force the doors open, bombing accuracy was consequently poor.
The aircraft was ordered directly from the drawing board with the first production model serving as the only prototype. The service name then became Blenheim Mk I after the famous battle during the War of the Spanish Succession. Subsequent deliveries started on 10 March 1937, with 114 Squadron being the first squadron to receive the Blenheim. The aircraft was built under license by countries including Finland and Yugoslavia, which built 60 aircraft. Other countries bought it, including Romania, Greece and Turkey. Total production of the Blenheim Mk I in England was 1,351 aircraft.
Work on an extended-range reconnaissance version started as the Blenheim Mk II, which increased tankage from 278 gal (1,264 L) to 468 gal (2,127 L), but only one was completed. Another modification resulted in the Blenheim Mk III, which lengthened the nose, and thereby dispensed with the "stepless cockpit" format of the Mk.I in introducing a true windscreen in front of the pilot, 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 the turret acquired a pair of Brownings instead of the Vickers K; creating the Blenheim Mk IV. A total of 3,307 were produced.
Another modification led to a long-range fighter version; the Blenheim Mk IF. For this role, about 200 Blenheims were fitted with a gun-pack under the fuselage for four .303 in (7.7 mm) Brownings. Later, the Airborne Intercept (AI) Mk III or IV radar was fitted to some aircraft in use as night fighters; these were the first British fighters to be equipped with radar. Their performance was marginal as a fighter, but they served as an interim type, pending availability of the Beaufighter. About 60 Mk IVs were also equipped with the gun pack as the Mk IVF and were used by Coastal Command to protect convoys from German long-range bombers.
The last bomber variant was conceived as an armoured ground attack aircraft, with a solid nose containing four more Browning machine guns. Originally known as the Bisley, (after the shooting competitions held at Bisley), the production aircraft were renamed Blenheim Mk V and featured a strengthened structure, pilot armour, interchangeable nose gun pack or bombardier position, and yet another Mercury variant, this time with 950 hp (710 kW). The Mk V was ordered for conventional bombing operations, with the removal of armour and most of the glazed nose section. The Mk V, or Type 160, was used primarily in the Middle East and Far East.
On the day that war was declared on Germany a Blenheim piloted by Flying Officer Andrew McPherson was the first British aircraft to cross the German coast and the following morning 15 Blenheims from three squadrons set off on one of the first bombing missions. With the rapid advances in technology which had taken place in the late 1930s, by then the aircraft was already obsolescent. The Blenheim was regarded as a pleasant aircraft to fly, although it did have some characteristics which could catch even experienced pilots by surprise. It had become heavier as extra service equipment was installed; much of this was found to be needed through operational experience. This, coupled with the rapid performance increases of fighters, had eclipsed the Blenheim's speed advantage. The light armament of one .303 in (7.7 mm) Vickers VGO in the turret and one .303 in (7.7 mm) Browning machine gun in the port wing was seldom able to deter fighter opposition. Squadrons were forced to use several different improvisations in an attempt to provide better defensive armament, until officially sanctioned modifications were able to be introduced in early 1940. The Blenheim also proved to be vulnerable to flak, especially around the rear fuselage. Flexible, self-sealing liners had been fitted to the fuel tanks but they were still not fully protected against the 20 mm MG FF cannon carried by the Luftwaffe's Bf 109s and Bf 110s. After France fell to Germany in June 1940, the Free French Air Force was formed at RAF Odiham in the form of Groupe Mixte de Combat (GMC) 1, consisting of a mixed bag of Blenheims and Westland Lysander liaison/observation aircraft, which eventually went to North Africa and saw action against the Italians and Germans.
The Battle of Britain
The Blenheim units operated throughout the battle, often taking heavy casualties, although they were never accorded the publicity of the fighter squadrons. The Blenheim units raided German occupied airfields throughout July to December 1940, both during daylight hours and at night. Although most of these raids were unproductive, there were some successes; on 1 August five out of 12 Blenheims sent to attack Haamstede and Evere (Brussels) were able to bomb, destroying or heavily damaging three Bf 109s of II./JG 27 and apparently killing a Staffelkapitän identified as Hauptmann Albrecht von Ankum-Frank. Two other 109s were claimed by Blenheim gunners.[f] Another successful raid on Haamstede was made by a single Blenheim on 7 August which destroyed one 109 of 4./JG 54, heavily damaged another and caused lighter damage to four more. There were also some missions which produced an almost 100% casualty rate amongst the Blenheims; one such operation was mounted on 13 August 1940 against a Luftwaffe airfield near Aalborg in north-eastern Denmark by 12 aircraft of 82 Squadron. One Blenheim returned early (the pilot was later charged and due to appear before a court martial but was killed on another operation), the other 11, which reached Denmark, were shot down, five by flak and six by Bf 109s. As well as the bombing operations, Blenheim-equipped units had been formed to carry out long-range strategic reconnaissance missions over Germany and German-occupied territories. In this role, the Blenheims once again proved to be too slow and vulnerable against Luftwaffe fighters and they took constant casualties.
Cologne power stations raid
The action on 12 August 1941 was described by the Daily Telegraph in 2006 as the "RAF's most audacious and dangerous low-level bombing raid, a large-scale attack against power stations near Cologne." The raid was a low-level daylight raid by 54 Blenheims under the command of Wing Commander Nichol of No. 114 Squadron RAF. The Blenheims hit their targets (Fortuna Power Station in Oberaußem-Fortuna and the Goldenberg Power Station in Hürth-Knapsack) but 12 of the Blenheims were lost during the raid, 22% of those that took part which was far above the sustainable loss rate of less than 5%. The England cricketer S/L Bill Edrich was awarded the DFC for his part in the raid.
The Bristol Blenheim was used by both Bomber and Fighter Commands. Some 200 Mk I bombers were modified into Mk IF long-range fighters with 600 (Auxiliary Air Force) Squadron based at Hendon, the first squadron to take delivery of these variants in September 1938. By 1939, at least seven squadrons were operating these twin-engine fighters and within a few months, some 60 squadrons had experience of the type. The Mk IF proved to be slower and less nimble than expected, and by June 1940, daylight Blenheim losses were to cause concern for Fighter Command. It was then decided that the Mk IF would be relegated mainly to night fighter duties where No. 23 Squadron RAF who had already operated the type under night time conditions had better success.
In the German night bombing raid on London, 18 June 1940, Blenheims accounted for five German bombers thus proving they were better suited to night fighting. In July, No. 600 Squadron, by then based at RAF Manston, had some of its Mk IFs equipped with AI Mk III radar. With this radar equipment, a Blenheim from the Fighter Interception Unit (FIU) at RAF Ford achieved the first success on the night of 2–3 July 1940, accounting for a Dornier Do 17 bomber. More successes came and before long, the Blenheim proved itself invaluable as a night fighter. Gradually, with the introduction of the Bristol Beaufighter in 1940–1941, the Blenheim was supplanted by its faster, better armed progeny.
Blenheims continued to operate widely in many combat roles until about 1943, equipping RAF squadrons in the UK and in British bases in Egypt, Iraq, Aden, India, British Malaya, Singapore, and the Dutch East Indies. Many Blenheims were lost to Japanese fighters during the Malayan Campaign, battles for Singapore, and Sumatra. By that point, the traditional daylight light bomber role was more effectively carried out by suitable fighter-bombers, and the surviving examples were relegated to training duties. Nonetheless, the Blenheim played a role in preventing India from falling and recapturing Burma, destroying over 60 aircraft on the ground in raids on Bangkok early in the campaign.
One Blenheim pilot, Squadron Leader Arthur Scarf, was posthumously awarded the Victoria Cross for an attack on Singora, Thailand, on 9 December 1941. Another bomber of No. 60 Squadron RAF was credited with shooting down Lt Col Tateo Katō's Nakajima Ki-43 fighter and badly damaging two others in a single engagement on 22 May 1942, over the Bay of Bengal. Katō's death was a severe blow for the Imperial Japanese Army Air Force. The Air Ministry's replacement for the Blenheim as a daylight bomber, another Bristol design the Buckingham, was overtaken by events and changes in requirements and considered inferior to the de Havilland Mosquito, and as such did not see combat. The final ground attack version - the Blenheim Mk V - first equipped 139 Squadron in June 1942. Eventually 13 squadrons - mainly in the Middle East and Far East - received this variant but operated them generally only for a few months.
In 1936, the Finnish Air Force ordered 18 Blenheim Mk Is from Britain and two years later, they obtained a manufacturing license for the aircraft. Before any aircraft could be manufactured at the Valtion lentokonetehdas (State Airplane Factory) in Finland, the Winter War broke out, forcing the Finns to order more aircraft from the UK. A further 24 British-manufactured Blenheims were ordered during the Winter War. After the Winter War, 55 Blenheims were constructed in Finland, bringing the total number to 97 aircraft (75 Mk Is and 22 Mk IVs). The Finns also received 20 half-completed ex-Yugoslavian Mk IV Blenheims captured by Germany, together with manufacturing tools and production equipment, as well as a huge variety of spare parts. Yugoslavia had ceased production of the Mk I and commenced a production run of Mk IVs just prior to the April 1941 invasion.
The Finnish Blenheims flew 423 missions during the Winter War, and close to 3,000 missions during the Continuation War and Lapland War. Blenheim machine gunners also shot down eight Soviet aircraft. Thirty-seven Blenheims were lost in combat during the wars. After the war, Finland was prohibited from flying bomber aircraft by the Paris Peace Treaty, with Finland's Blenheims being placed into storage in 1948. However, in 1951, five Blenheims were re-activated for use as target tugs, with the last flight of a Finnish Blenheim taking place on 20 May 1958.
- Blenheim Mk I
- Three-seat twin-engined light bomber, powered by two 840 hp (630 kW) Bristol Mercury VIII radial piston engines, armed with a 0.303 in (7.7 mm) machine gun in the port wing, plus a 0.303 in (7.7 mm) Vickers K gun in the dorsal turret, maximum bombload 1,000 lb (450 kg). 1,552 built. Company designation Type 142M.
- Blenheim Mk IF
- Night fighter version, equipped with an AI Mk III or Mk IV airborne interceptor radar, armed with four 0.303 in (7.7 mm) machine guns in a special gun pack under the fuselage. About 200 Blenheim Mk Is were converted into Mk IF night fighters.
- Blenheim Mk II
- Long-range reconnaissance version with extra fuel tankage. Only one Blenheim Mk II was built.
- Blenheim Mk III
- Blenheim Mk IV
- Improved version, fitted with protective armour, powered by two 905 hp (675 kW) Bristol Mercury XV radial piston engines, armed with a 0.303 in (7.7 mm) machine gun in the port wing, plus two 0.303 in (7.7 mm) machine-guns in a powered operated dorsal turret, and two remotely controlled rearward-firing 0.303 in (7.7 mm) machine gun mounted beneath the nose, maximum bombload 1,000 lb (450 kg) internally and 320 lb (150 kg) externally. 3,307 built.
- Blenheim Mk IVF
- Long-range fighter version, armed with four 0.303 in (7.7 mm) machine guns in special gun pack under the fuselage. About 60 Blenheim Mk IVs were converted into Mk IVF fighters.
- Blenheim Mk V
- High-altitude bomber version, powered by two Bristol Mercury XV or XXV radial piston engines.
There are currently no Blenheim or Bolingbroke aircraft that are airworthy. The first airworthy Blenheim had been rebuilt from a scrapped Bolingbroke over a 12-year period, only to crash at an airshow at Denham within a month of completion. A replacement Bolingbroke Mk IVT was rebuilt to flying status in just five years and painted to represent a Blenheim Mk IV in RAF wartime service. It began appearing at air shows and exhibitions in the UK, flying since May 1993 and was used in the 1995 film version of Shakespeare's Richard III. This aircraft crashed on landing at Duxford on 19 August 2003; the crash was feared to have made it a write-off, but it is presently undergoing an extensive repair and conversion to Mark 1 status ("Short nose" version) in conjunction with The Aircraft Restoration Company (ARC or ARCo), most of the work being done by volunteers. Funds are raised through donations and also by The Blenheim Society who run a Grand Flying Draw among many other activities. The aircraft is currently in Hangar 3 at the Imperial War Museum at Duxford and is the property of Blenheim (Duxford) Ltd.
In Canada, a number of other Bolingbrokes survived the war but were summarily consigned to the scrap heap. Postwar, enterprising farmers often bought surplus aircraft such as these for the scrap metal content, tires for farm implements, and even for the fuel remaining in the tanks. Some surviving examples in Canada of the Bolingbroke can be traced back to this period. The Canadian Warplane Heritage Museum in Hamilton, Ontario is rebuilding a Bolingbroke to airworthy status. The Commonwealth Air Training Plan Museum in Brandon, Manitoba has restored the exterior of one Bolingbroke, painting it in the Air Training Plan yellow color. This particular aircraft is on display at a location on the Trans-Canada Highway in Brandon. A restored Bolingbroke is on static display at the British Columbia Aviation Museum in Victoria, British Columbia. The Canadian Museum of Flight at Langley Airport, Langley, British Columbia has on display the restored nose and cockpit section of a Bolingbroke, and holds the rest of an entire airframe in storage pending future restoration and display. In Finland, the sole surviving original Blenheim in the world, a Mk IV registered as BL-200 of the Finnish Air Force, has been completely restored and is now on show at the Aviation Museum of Central Finland at Tikkakoski. In the summer of 1996, a Bristol Blenheim Mk IVF was recovered from the sea, a few km off Rethymnon, Crete. The aircraft belonged to No. 203 Squadron RAF and was downed by friendly fire on 28 April 1941. The Blenheim was restored and moved to the Hellenic Air Force Museum.
In Arizona, the Pima Air Museum has a Bristol Blenheim Mk IV on static display.
Specifications (Blenheim Mk IV)
Data from British Warplanes of World War II
- Crew: 3
- Length: 42 ft 7 in (12.98 m)
- Wingspan: 56 ft 4 in (17.17 m)
- Height: 9 ft 10 in (3.0 m)
- Wing area: 469 ft² (43.6 m²)
- Empty weight: 9,790 lb (4,450 kg)
- Loaded weight: 14,400 lb (6,545 kg)
- Powerplant: 2 × Bristol Mercury XV radial engine, 920 hp (690 kW) each
- Propellers: Three-bladed Hamilton Standard propeller
- Maximum speed: 266 mph (231 kn, 428 km/h at 11,800 ft (3,597 m))
- Cruise speed: 198 mph (172.25 kn, 319 km/h)
- Range: 1,460 mi (1,270 nmi, 2,351 km)
- Service ceiling: 27,260 ft (8,310 m)
- Rate of climb: 1,500 ft/min (7.6 m/s)
- Wing loading: 30.7 lb/ft² (150 kg/m²)
- Power/mass: 0.13 hp/lb (.21 kW/kg)
- 1200 lb (540 kg)
- 4 × 250 lb (113 kg) bombs or
- 2 × 500 lb (227 kg) bombs internally and 8× 40 lb (18 kg) bombs externally
- Bristol Beaufort
- Bristol Beaufighter
- Bristol Fairchild Bolingbroke
- Bloch MB.170
- Dornier Do 17
- Tupolev SB
- List of bomber aircraft
- List of aircraft of the United Kingdom in World War II
- List of aircraft of World War II
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|Wikimedia Commons has media related to Bristol Blenheim.|
- RAF Bristol Blenheim history
- No. 211 Squadron RAF
- Blenheim Society
- Aircraft Restoration Company
- Finnish Mk IV Blenheim restoration
- "Up in the Blenheim, a civilian pilot's impressions..."; Flight, 24 June 1937
- "How the Bristol Blenheims are erected"; Aircraft Engineer (supplement to Flight), 19 May 1938
- "In the air IV – Flying the Blenheim"; Flight, 15 November 1945
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