Handley Page Halifax

Origins In the 1930s, the Royal Air Force (RAF) was primarily interested in twin-engine bombers. These designs put significant demands on engine production and maintenance, both of which were already stretched with the introduction of many new types of aircraft into service. Power limitations were so serious that the British invested heavily in the development of huge engines in the class to improve performance. However, during the late 1930s, none of these engines were ready for production. Meanwhile, the United States, France, Germany and the Soviet Union were developing bombers powered with four engines with favourable results, including excellent range and lifting capacity. Accordingly, in 1936, the RAF decided to investigate the feasibility of a four-engined bomber. During the mid-1930s, the British Air Ministry released Specification P.13/36, seeking a twin-engine heavy-medium bomber suitable for "world-wide use". Further requirements of the specification included the use of a mid-mounted cantilever monoplane wing and all-metal construction, and encouraged use of the Rolls-Royce Vulture engine then in development. In response, Handley Page produced the twin-engine H.P.56 design to meet Specification P.13/36. Handley Page aircraft designer George Volkert had responsibility for the design. Other candidates were submitted for the same specification, including the Avro 679, and designs from Fairey, Boulton Paul and Shorts. All submissions used two engines, using the Rolls-Royce Vulture, Napier Sabre, Fairey P.24 or Bristol Hercules engines. All of these engines were under development and while four-engined bomber designs were considered for specification B.12/36 for a heavy bomber, wings mounting two pairs of engines required additional testing at the Royal Aircraft Establishment (RAE). A stronger wing also required additional strengthening of the overall aircraft structure, increasing design weight. , 1942 In February 1937, following consideration of the designs, the Air Ministry selected Avro's submission, with Handley Page's bid chosen as "second string". Accordingly, during April 1937, the Air Ministry ordered two prototypes of each design. The introduction of the successful P.13/36 candidates was delayed by orders for Armstrong-Whitworth Whitley and Vickers Wellington bombers. In mid-1937, it was decided to order both the Avro 679 and H.P.56 designs "off the drawing board" in order to speed up delivery timetables. During July 1937, Handley Page was instructed to redesign the H.P.56 to use four engines. The Vulture had already been suffering reliability and performance problems. The rival Avro 679 proceeded into service as the Avro Manchester powered by a pair of Vulture engines, but was only built in limited quantities after suffering substantially from engine trouble. The four-engine redesign increased its wingspan from to and added of weight. In September 1937, the Ministry specified the use of four Rolls-Royce Merlin engines; according to aviation author Phillip J. R. Moyes, this redesign to four Merlin engines was done "much against the company's wishes". Towards the end of the year, a full-size mock-up was assessed and production of a pair of H.P.57 prototypes commenced in March 1938. Further design modifications resulted in the definitive aircraft, now considerably enlarged and powered by four Rolls-Royce Merlin X engines. Such was the promise of the new model that, in January 1938, the RAF chose to place their first production order for the type, ordering 100 Mk.I Halifaxes "off the drawing board", at which point the serials which had already been assigned to the H.P.56 were switched to the H.P.57. Prototypes testing, 1942 The first prototype was built at Handley Page's facility in Cricklewood, London, It was then dismantled and transported by road to RAF Bicester (the nearest non-operational RAF airfield with suitable facilities) for reassembly. The first flight of the first prototype Halifax, serial number L7244, was performed by chief test pilot Jim Cordes with E A 'Ginger' Wright as flight test observer on 25 October 1939. During this flight, the undercarriage was locked down as a safety precaution. On 17 August 1940, the first flight of the second prototype, L7245, now complete with full armament and operational equipment, was made from Radlett Aerodrome. The H.P.57 was given the service name Halifax upon acceptance. This name followed the practice of naming heavy bombers after major towns, which in this case was Halifax in Yorkshire. In September 1941, a production Halifax Mk.I participated in an official naming ceremony of the type, officiated by Lord Halifax and Lady Halifax. Production Series production of the Halifax began at Handley Page's factory at Cricklewood and at English Electric's site in Samlesbury, Lancashire. In order to speed up production, Handley Page implemented several new manufacturing techniques, including two pioneering approaches: photo-lofting and split construction. In the latter capacity, each Halifax was built from various sub-assemblies. Surface panels were flush-riveted, although the matt black night bomber camouflage negated its benefit. Handley Page built the assemblies and components at Cricklewood and the aircraft were assembled and flown from Radlett Aerodrome. The first production aircraft flew from Radlett on 11 October 1940. The sizeable production run envisioned required the involvement of several other companies in addition to Handley Page. The resulting Halifax Group was established to oversee the manufacturing programme, comprising English Electric (who had previously built Handley Page Hampdens), various firms within the London Aircraft Production Group, Fairey Aviation, and Rootes Motors. Because of this scheme, Halifaxes were manufactured at sites across the British isles. The Halifax was produced in large numbers during the war and over 40%, or 4,046 of the 10,018 heavy bombers produced in Britain between 1940 and 1944 were Halifaxes. In all, 6,178 Halifaxes were built, the last delivered in April 1945. At the peak, 41 separate factories and dispersed units were involved in production, along with 600 subcontractors and 51,000 employees, with one Halifax completed every hour. The first English Electric-built aircraft was flown from Samlesbury on 15 August 1941. The first production standard Halifax, the Mk.I, had a long bomb bay and six wing bomb cells, and could carry a load. Defensive armament consisted of two Browning machine guns in a Boulton Paul Type C nose turret, with an additional four in a Boulton Paul Type E tail turret. Some aircraft included two additional Vickers K machine guns in beam (side, or "waist") positions. Subtle modifications distinguished the Mk.I aircraft. Aircraft of the first batch of fifty Mk.I Halifaxes were designated Mk.I Series I. Improvements Handley Page were initially disappointed with the performance of the Halifax which was below their predictions, much of this was because they had under-estimated the aircraft's drag. The Mk.III Halifax had a wider span of and had significantly improved performance. Arguably the Merlin engine did not suit the Halifax as much as the Hercules (fitted from the Mk.III on) which suited the Halifax better both aerodynamically and in power. The Halifax Mk.I was quickly followed by 25 of the Mk.I Series II; these featured an increased gross weight from to but with maximum landing weight unchanged at . The Halifax Mk.I Series III featured increased fuel capacity ( and larger oil coolers, the latter of which having been adopted in order to accommodate the Merlin XX engine. A dorsally-mounted two-gun Boulton Paul Type C turret replaced the beam guns. V9977, in-which the first H2S radar was installed; note the early triangular fins. This aircraft crashed in June 1942 as a result of an engine fire. All on board were killed, including the electronic engineer Alan Blumlein. Introduction of Merlin XX engines and a twin dorsal turret instead of waist guns resulted in the Halifax B Mk.II Series I. The Mk.II Series I (Special) achieved improved performance via the removal of the nose and dorsal turrets. The Halifax Mk.II Series IA was fitted with a moulded Perspex nose (this nose became standard upon future Halifax variants), a four-gun Boulton Paul Type A dorsal turret similar to that used in the Boulton Paul Defiant, and Merlin 22 engines. The rudder overbalance / directional instability with engine(s) out problem was solved on the Mk.III with the fitting of a larger D type fin (40% bigger) and modified rudder. The Mk.III Halifax had satisfactory stability in all axes and was more stable in a dive than a Lancaster. A Lancaster tended to go deeper into a dive whereas a Halifax had to be forced to stay in the dive as the speed increased, i.e. it naturally flew out of a dive. Owing to a shortage of Messier-built landing gear and hydraulics, Dowty-built landing gear were used on some aircraft instead. As it was incompatible with the Messier equipment, this led to these Halifax bombers being given new designations: a Mark II built with Dowty gear was the Mark V. The use of castings rather than forgings in the Dowty undercarriage had resulted in an increased production rate but had also led to a reduced landing weight of . The Halifax Mark V were manufactured by Rootes Group at Speke and Fairey at Stockport; operationally, these were generally used by Coastal Command and for training purposes. Some 904 had been built when Mark V production ended at the start of 1944, compared to 1,966 Halifax Mk.IIs. The most numerous Halifax variant was the much improved B Mk.III of which 2,091 were built. First appearing in 1943, the Mk.III featured the Perspex nose and modified tail of the Mk.II Series IA but replaced the Merlin with the more powerful Bristol Hercules XVI radial engine. Other changes included the adoption of de Havilland Hydromatic propellers and a wider wing span with rounded wing tips. With the coming of the Mk.III the Halifax's performance finally matched that of the Lancaster though the latter had a larger bomb load and could take larger bombs. The B.VI Halifax's performance improved still further with a cruising speed of and a maximum speed (in 'Full Speed' supercharger mode) of at . Halifax crews, though admittedly not unbiased, considered the Mk.III Halifax to be the equal of any other bomber, including the Lancaster, and further improved versions (with more powerful Hercules engines) to be superior to all. The improvement in the Halifax Mk.III's performance could be measured objectively. In 1943 4 Group's Halifax squadrons flew 11,607 sorties for a loss of 485 aircraft, a loss rate of 4.2%. Halifax Mk.III production started in early Autumn 1943 and for 1944, when the Mk.III constituted an increasing percentage of the Halifax force, 4 Group flew 25,454 sorties for a loss of 402 aircraft, a loss rate of 1.6%. The Halifax B Mk.IV was a converted B Mk.II non-production design using the Rolls-Royce Merlin 65 engine with a two-stage supercharger and a four-bladed propeller fitted. This resulted in an increase in top speed by to at . Due to a shortage of Merlins with two-stage superchargers production of the B Mk.IV was not proceeded with. The definitive version of the Halifax was the B Mk.VI, powered by the Hercules 100. The final bomber version, the Mk.VII, reverted to the less powerful Hercules XVI. However, these variants were produced in relatively small quantities. The remaining variants were the Halifax C Mk.VIII, an unarmed transport that was fitted with an cargo pannier instead of a bomb bay, which could accommodate a maximum of 11 passengers and the Mk A IX paratroop transport, which had space for up to 16 paratroopers and their equipment. A transport/cargo version of the Halifax was also produced, known as the Handley Page Halton. ==Design==

Overview The Handley Page Halifax was a mostly orthodox design, a mid-wing monoplane with a tail unit featuring twin fins and rudders. The Halifax featured all-metal construction with a smooth, stressed skin covering the majority of the exterior surfaces; the flight control surfaces were an exception, being fabric-covered instead. The slab-sided fuselage contained a 22-foot bomb bay, which contained the majority of the Halifax's payload, while the cockpit was flush with the upper fuselage. The Halifax was powered by four engines, two on each wing. Early production Halifax bombers were powered by models of the Rolls-Royce Merlin engine; later aircraft were commonly powered by the larger Bristol Hercules radial engine. To contain and attach the engines to the airframe, Handley Page developed their own design for the power egg instead of using the typical, slimmer Rolls-Royce counterpart; despite generating increased drag, this in-house design was readily adaptable to the alternative Hercules engine on later aircraft. Each engine drove a Rotol-built compressed wood constant-speed propeller, enabling the Halifax B.I to attain a maximum speed of at . With a typical payload of of bombs and of fuel, it had a range of . The defensive armaments included power-assisted gun turrets in various positions located across the aircraft. Different models of the Halifax used different numbers and combinations of turrets, effectively trading speed for firepower and vice versa. Crew positions and armament The bomb-aimer's position was in the extreme nose with the navigator's table located behind it, with the bomb-aimer additionally serving as the front gunner. Above the navigator's position was the forward gun turret. The wireless (radio) operator was behind the navigator's position, separated by a half-width partition. Starting with the Halifax Mk.II Series IA and from the Mk.III onwards, the nose turret was deleted; instead the bomb-aimer occupied a streamlined perspex nose containing a single hand-held machine gun. On later-built aircraft, the two-gun dorsal turret was replaced by a four-gun Boulton Paul turret. The maximum bomb load was , which was primarily carried in a bomb bay housed within the fuselage, divided into six separate bomb compartments, with three bomb compartments in the inboard sections of each wing; this division of the payload between multiple compartments limited the maximum size of the individual bombs which could be completely enclosed to ; when carrying the Blockbuster bomb of and high capacity (HC) bombs the bomb bay doors could not close fully. ==Operational service==

and Gneisenau at left in dry dock at Brest, France, 18 December 1941. 'Prinz Eugen' is moored at far right. In November 1940, the Handley Page Halifax entered service with No. 35 Squadron at RAF Linton-on-Ouse. Its operational debut occurred on the night of 10–11 March 1941, when six Halifax bombers flew a bombing raid against Le Havre, targeting the area around the docks and any shipping that might be present. The existence of the Halifax was not officially acknowledged until July 1941, after it was used in a daylight attack on La Pallice, France, against the German battleship Scharnhorst. At the end of 1941, the Halifax was withdrawn from daylight bombing operations after intensifying fighter opposition had increased the casualty rates to unsustainable levels. In the second half of 1942, No. 35 Squadron and four other squadrons were selected to form the Pathfinder Force, later expanded to become No. 8 Group. Pathfinder crews flying the Halifax would mark routes and identify and mark targets for the Main Force. Effective marking greatly increased the accuracy and destructive power of Bomber Command. As a Pathfinder and Main Force aircraft, the Halifax was a core part of the bombing offensive against Germany and its Axis allies. By the end of 1943, No. 4 Group had been entirely equipped with the Halifax, and would continue to operate the aircraft until the end of the war. No. 6 Group, formed of Royal Canadian Air Force (RCAF) squadrons, also adopted the Halifax around the same time, and would go on to operate it in each of its 14 squadrons, although it was never solely equipped with the type. At its peak strength, Bomber Command operated a total of 76 Halifax-equipped squadrons. While the early-built models of the Halifax were heavily used by Bomber Command and made valuable contributions to operations, the aircraft's performance was considered unsatisfactory for the most part, mainly due to the underpowered Merlin engine, which meant that it could not fly at the higher altitudes needed to avoid enemy fighters, which were becoming increasingly effective throughout 1943. This was answered by the Halifax Mk.III, which was powered by Bristol Hercules radial engines in place of the Merlins. Introduced into service in November 1943, the Mk.III was first delivered to No. 433 Squadron and No. 466 Squadron. By January 1944, the Hercules-powered Halifax was available in quantity and quickly proved to have superior performance in the face of German fighter defences. Early on, Air Chief Marshal Arthur Harris, head of Bomber Command, was scathing in his criticism of the Halifax's performance in comparison to the new Avro Lancaster, primarily of its bomb-carrying capability: an average Halifax was calculated to drop 100 tons of bombs in its lifetime, compared to a Lancaster's 154. Harris continued to have a poor opinion of the Halifax, despite the fact that later Hercules-engined machines had lower loss rates and higher crew survival rates after abandoning the aircraft than Lancasters, and came very close to the Lancaster's speed and altitude performance. The Halifax was progressively outnumbered in front-line service over occupied Europe as more Lancasters became available from 1943 onwards; many squadrons converted to the Lancaster. Production of the Halifax continued, supposedly because it was more efficient to keep building it than to stop its production and convert to building another aircraft. But any new facilities were devoted to the Lancaster. Harris's view of the Halifax changed sometime after spring 1942. On 2 June 1942, in a response to a telegram sent by Frederick Handley Page, congratulating Harris on the success of the first 1000 bomber Cologne raid, he stated: "My Dear Handley Page. We much appreciate your telegram of congratulation on Saturday night's work, the success of which was very largely due to your support in giving us such a powerful weapon to wield. Between us we will make a job of it." Following the invasion of Europe in 1944, the Halifax resumed daylight bombing operations, performing semi-tactical strikes upon enemy troop concentrations, gun emplacements, and strongpoints of the Atlantic Wall defences along the French coast with a reportedly high degree of accuracy. Other common targets were enemy communications and the launch sites for V-1 flying bombs. Bombing activity became increasingly brazen throughout late 1944 as the Luftwaffe became incapable of putting up effective opposition against allied air forces. The Halifax also found itself being increasingly tasked with transport duties around this time; in one instance, around half a million gallons of petrol was delivered to Brussels in support of the advancing Second Army, then engaged in heavy fighting at Arnhem. During the latter half of 1944, the bombing of German-held oil facilities became a major priority of the offensive. On 27 August, a force of 216 Halifax bombers, alongside smaller numbers of de Havilland Mosquitos and Lancasters and a sizable escort of Supermarine Spitfires, conducted the first major daylight operation by Bomber Command against a target inside Germany that year, attacking the oil refinery at Homberg on the Ruhr. In spite of heavy fire from anti-aircraft defences, no bombers were downed and the refinery was severely damaged in places. Attacks upon oil production facilities throughout Germany would become commonplace within the remaining months of the war. operating in RAF Middle East Command, September 1942 The only Victoria Cross to be awarded to any Halifax pilot went to Cyril J. Barton of No. 578 Squadron for displaying great gallantry in bringing his heavily damaged aircraft back after a raid on Nuremberg on the night of 30/31 March 1944. Barton continued to fly the Halifax while other crew members bailed out. He was killed in the aircraft's crash-landing, but the remaining crew survived due to his actions. glider to the tow hook of a Halifax glider tug, of 295 Squadron, in preparation for Operation Fustian, Tunisia (July 1943) Large numbers of Halifax bombers were also operated by Coastal Command, which used it to conduct anti submarine warfare, reconnaissance and meteorological operations. The Halifax was heavily used to deploy mines in the vicinity of enemy-held ports. It served increasingly in other support capacities as the war progressed, being used as a glider tug, an electronic warfare aircraft for No. 100 Group and to conduct special operations, such as parachuting agents and arms into occupied Europe, for the Special Operations Executive (SOE). As a glider tug the Halifax was superior to the Lancaster, the Halifax Mk.III's "tug weight at take off" was higher than a Lancaster Mk.II's . Throughout early 1945, the Halifax was frequently dispatched against cities within the German homeland, including Hannover, Magdeburg, Stuttgart, Cologne, Münster, Osnabrück and others. During these months, infrastructure such as oil facilities and railways were given a high priority; these targets were attacked right up until the end of the war. According to Moyes, within the final few months, bomber losses had fallen to all-time lows while raids were frequently regarded as having been highly successful. During the final months of the war the improved Halifax Mk.VI and Mk.VII were introduced. In particular, these models had been 'tropicalised' with an eye towards their potential use in the Pacific War against the Empire of Japan. While some of these Mk.VI and Mk.VII machines were deployed to the theatre, they played little meaningful role as the war ended before larger numbers could be brought to bear against Japanese forces. On 25 April 1945, the Halifax performed its last major operation against the enemy in WWII during an attack upon coastal gun batteries on Wangerooge in the Frisian Islands of the North Sea. While the type continued to fly operations after this, these were primarily diversions to other operations and sporadic, uncoordinated attacks against targets of opportunity. Upon the end of the conflict, Bomber Command quickly disbanded the majority of its Halifax-equipped squadrons; the aircraft themselves were transferred to Transport Command. During the type's service with Bomber Command, Halifaxes flew 82,773 operations and dropped 224,207 tons of bombs. 1,833 aircraft were lost. By 1947, the majority of Halifax bombers were deemed to be surplus and scrapped. The Halifax remained in widespread service with Coastal Command and RAF Transport Command, Royal Egyptian Air Force and the ''Armée de l'Air'' until early 1952. The Royal Pakistan Air Force however continued operating them up till 1961, thus Pakistan became the last military user of the type. In 1947, the RPAF inherited two Halifax bombers from the RAF which were later heavily used during the 1st Kashmir War in 1948. RPAF Halifaxes flew several sorties in support of Pakistani and Kashmiri forces (notably in the Battle of Skardu) during which they conducted night-time Airdrop missions. After the war, six ex-RAF Halifax-BVIs were purchased in 1949. Due to their high operational costs, the RPAF Commanders decided not to enlarge the Halifax fleet too much. These airplanes were later transferred to the newly raised No. 12 Squadron PAF, where they were only used in emergency situations. Gradually, they were transferred to long-term storage and were later scrapped. In September 1997 Halifax 57 Rescue of Canada excavated Halifax LW682 from a bog near the River Dender in Belgium. The plane was part of RCAF 426 Squadron, and had been shot down near Geraardsbergen during a raid on Leuven, Belgium on 12 May 1944. During the excavation, the bodies of three crew members were recovered and later given proper burial. Several items from the plane were used in restoration of NA337, while other items were transferred to museums. The airframe was melted down and used to construct the ceiling of the RAF Bomber Command Memorial in London, which was unveiled in 2012. Civilian operation at Manchester Airport in 1950 A number of former RAF Halifax C.8s were sold from 1945 and used as freighters by a number of mostly British airlines. In 1948, 41 civilian Halifax freighters were used during the Berlin Air Lift, operating 4,653 sorties carrying freight and 3,509 carrying bulk diesel fuel. Nine aircraft were lost during the airlift. The low-cost airline business pioneer Freddie Laker bought and serviced war-surplus Halifaxes for Bond Air Services operations in the Berlin airlift. With the airfreight market in decline, most of the civilian Halifaxes were scrapped on their return to England. The last civilian-operated Halifaxes were withdrawn from service in late 1952. == Variants ==

(yellow) and the Avro Lancaster (blue) Pre-Halifax designs ;H.P.55 :Proposed twin-engine bomber aircraft, never built. ;H.P.56 :Proposed twin-engine bomber aircraft, fitted with two Rolls-Royce Vulture engines, never built. H.P.57 ;H.P.57 :L7244 – Prototype first flew on The first Halifax prototype with four Merlin 10 engines and no armament. :L7245 – Second prototype first flew from Radlett on 17 August 1940 and was more representative of the production configuration including armament. ;;Halifax B.I Series I undergoing maintenance at RAF Middleton St George, County Durham ::Four-engined long-range heavy-bomber aircraft powered by Rolls-Royce Merlin X engines; the first production version. Armament consisted of nose turret with two guns, tail turret with four guns and two beam guns. Recognizable from large deep radiator intakes containing circular Gallay radiators and oil cooler. 50 produced. ;;Halifax B.I Series II ::Stressed for operating at a higher gross weight. 25 produced. ;;Halifax B.I Series III ::Re-engined with Merlin XX engines with slimmer coolers, introduced new twin-gun Boulton Paul type C upper turret in place of beam guns, with revised undercarriage and additional centre-section fuel tanks. 9 produced. H.P.58 ;Halifax Mk.II :Projected variant with revised armament including cannon and no tail turret. Due to problems with the new armament, the project was cancelled and the Mk.II designation given to H.P.59. H.P.59 at Brindisi, Italy. Note the parachute canisters containing supplies for the Yugoslav National Liberation Army loaded into the bomb bay and wing cells getting airborne from RAF Portreath, Cornwall, towing an Airspeed Horsa glider to Tunisia during Operation Beggar, June 1943 ;Halifax Mk.II :New variant with increased takeoff weight, fuel and weapons carriage. ;Halifax B.II Series I :First series of the bomber variant; from March 1942 onwards, these were fitted with TR1335 navigation aids. ;Halifax B.II Series I (Special), SOE :Special version for Special Operations Executive (SOE) used to drop supplies over Europe. Nose armament and dorsal turret removed, the nose being faired over, as well as changes to the fuel vent pipes and exhaust shrouds. ;Halifax B.II Series I (Special) , with a faired-over nose. During April–May 1942, this aircraft took part in a number of raids on the in Fættenfjord near Trondheim, Norway. :Generally similar to the aircraft used by the SOE, these were employed in the bombing role. These aircraft were more varied in appearance, especially concerning the fitting of dorsal armament with some aircraft retaining the standard Boulton Paul "Type C" turret in different mounts with others mounting a "Type A" turret. There were also examples with no dorsal turret, similar to the SOE-aircraft. ;Halifax B.II Series IA :Modified with new glazed nose section, Merlin XX or 22 engines, new square Morris radiators and new "D" fin and rudder. The dorsal turret was changed to a four-gun Boulton Paul Type A Mk.VIII, and there were improvements to the bomb bay door sealing. Some aircraft were fitted with the H2S radar. ;Halifax B.II Series I, Freighter :A few Mk.IIs were employed in the transport role in Great Britain (unmodified SOE-aircraft) and in the Middle East (simple modifications to allow carriage of engines or Spitfire fuselages). ;Halifax B.II Series II :Single aircraft (HR756) modified with three-blade Rotol propellers and Merlin 22 engines. Rejected in favour of Mk.III. ;Halifax A.II :According to some sources, a handful of the airborne forces Halifaxes were converted into B.IIs. If this is true they might have been designated A.II or may have retained their bomber designations. ;Halifax GR.II :Coastal Command variant of the Halifax B.II. ;Halifax GR.II Series I :A handful of aircraft converted from Series I or Special to GR.II standard, having differences in dorsal armament. The main difference was the fitting of a ASV.Mk 3 radar in an H2S type fairing. Sometimes, a machine gun was fitted in the faired nose. ;Halifax GR.II Series IA :Definitive Coastal Command variant of the GR.II with glazed nose mounting machine gun, Merlin XX or 22 engines, B-P A-type dorsal turret and extra long-range fuel tanks in fuselage. A ventral turret with a single machine gun was mounted on most aircraft although some employed the ASV.Mk 3 radar in its place. ;Halifax Met.II :Some sources suggest that there were a meteorological variant of the B.II, designated Met.II, but this is unlikely. H.P.61 in front of a Halifax bomber, circa 1944 ;Halifax B.III :Main production variant, fitted with Bristol Hercules engines. B.III bombers were fitted with transparent nose dome with single machine gun, Boulton Paul dorsal turret with four guns and tail turret with four guns. All but first few had longer wing with rounded wingtips that increased wingspan to 104 ft 2 in (31.75 m). 2,091 produced. ;Halifax A.III :Halifax B.III bombers converted into glider tug and paratroop transport aircraft. ;Halifax C.III :Halifax B.III bombers converted into military transport aircraft. H.P.63 undergoing a 24-hour overhaul at RAF Holmsley South, Hampshire, 1943 s via tow ropes of No. 298 Squadron and No. 644 Squadron, at RAF Woodbridge, Suffolk, prior to launch ;Halifax B.V :Four-engined long-range heavy-bomber, powered by four Rolls-Royce Merlin XX engines with square empennage and wingtips. Armament as B.III. 904 produced. ;Halifax B.V Series I (Special) ;Halifax A.V :Halifax B.V bombers converted into glider tugs and paratroop transport aircraft. ;Halifax GR.V :Coastal Command variant. Halifax B.V bombers converted into maritime reconnaissance aircraft. ;Halifax B.VI :Four-engined long-range heavy-bomber, powered by four Bristol Hercules XVI radial engines with H2S radar. No dorsal turret. Square empennage, round wing tips. 643 produced. ;Halifax C.VI :Halifax B.VI bombers converted into military transport aircraft. ;Halifax GR.VI :Coastal Command variant. Halifax B.VI bombers converted into maritime reconnaissance aircraft. ;Halifax B.VII :Four-engined long-range heavy-bomber, powered by four Bristol Hercules XVI radial engines. Round wing tips. Armament as B.III ;Halifax A.VII :Halifax B.VIIs converted into paratroop transport and glider tug aircraft. ;Halifax C.VII :Halifax B.VIIs bombers converted into military transport aircraft. H.P.70 ;Halifax C.VIII :Cargo and passenger transport aircraft. H.P.71 ;Halifax A.IX :Paratroop transport, glider tug aircraft. H.P.70 Halton ;Halton I :Interim civil transport version; postwar, a number of Halifax bombers were converted into civilian transport aircraft. ;Halton II :VIP transport aircraft for the Maharajah Gaekwar of Baroda. ==Operators==

Military operators at RAF Foulsham in 1945 in 1944 ; • Royal Australian Air Force • No. 460 Squadron RAAF • No. 462 Squadron RAAF • No. 466 Squadron RAAF ; • Royal Canadian Air Force • No. 405 Squadron RCAF • No. 408 Squadron RCAF • No. 415 Squadron RCAF • No. 419 Squadron RCAF • No. 420 Squadron RCAF • No. 424 Squadron RCAF • No. 425 Squadron RCAF • No. 426 Squadron RCAF • No. 427 Squadron RCAF • No. 428 Squadron RCAF • No. 429 Squadron RCAF • No. 431 Squadron RCAF • No. 432 Squadron RCAF • No. 433 Squadron RCAF • No. 434 Squadron RCAF ; • Royal Egyptian Air Force ; • Free French Air Forces • No. 12 Squadron ; • Polish Air Forces in exile in Great Britain • No. 301 Polish Bomber Squadron • C Flight No. 138 Squadron RAF, later No. 1586 (Polish Special Duties) Flight before reforming as 301 Squadron Special Duties • No. 304 Polish Bomber Squadron RAF ; • Royal Air Force • No. 10 Squadron RAF • No. 35 Squadron RAF • No. 47 Squadron RAF • No. 51 Squadron RAF • No. 58 Squadron RAF • No. 76 Squadron RAF • No. 77 Squadron RAF • No. 78 Squadron RAF • No. 96 Squadron RAF • No. 102 Squadron RAF • No. 103 Squadron RAF • No. 108 Squadron RAF • No. 113 Squadron RAF • No. 138 Squadron RAF • No. 148 Squadron RAF • No. 158 Squadron RAF • No. 161 Squadron RAF • No. 171 Squadron RAF • No. 178 Squadron RAF • No. 187 Squadron RAF • No. 190 Squadron RAF • No. 192 Squadron RAF • No. 199 Squadron RAF • No. 202 Squadron RAF • No. 224 Squadron RAF • No. 246 Squadron RAF • No. 295 Squadron RAF • No. 296 Squadron RAF • No. 297 Squadron RAF • No. 298 Squadron RAF • No. 502 Squadron RAF • No. 517 Squadron RAF • No. 518 Squadron RAF • No. 519 Squadron RAF • No. 520 Squadron RAF • No. 521 Squadron RAF • No. 578 Squadron RAF • No. 614 Squadron RAF • No. 620 Squadron RAF • No. 624 Squadron RAF • No. 640 Squadron RAF • No. 644 Squadron RAF Civil operators ; • Aircarrier (Former Wikner aircraft) • Geoffrey Wikner (B.III converted with a 15-passenger interior) ; • Aero Cargo • CTAI • SANA (Societe Anonyme de Navigation Aeriennes) ; • Peteair • Vingtor Airways ; ; • Alpha Airways • LAMS (South Africa) ; • Air Globe ; • Air Freight • Airtech • Bond Air Services • British American Air Services • British Overseas Airways Corporation • Chartair • C.L. Air Surveys • Eagle Aviation • Lancashire Aircraft Corporation • London Aero and Motor Services (LAMS) • Payloads • Skyflight • Union Air Services • V.I.P. Services • Westminster Airways (converted as a bulk fuel carrier for Berlin Airlift) • World Air Freight Halton operators ; India • Maharajah Gaekwar of Baroda ; • Louis Breguet ; • Alpha Airways ; • Bond Air Services • British American Air Services • British Overseas Airways Corporation • Westminster Airways • Worldair Carrier ==Surviving aircraft==

Of the 6,176 Halifaxes built, three complete examples remain. Recovery of Halifax wrecks Halifax NA337 and LW682A have been recovered by a Canadian group, Halifax 57 Rescue. Halifax NA337 was recovered in 1995 from under Lake Mjøsa, Norway before being restored at the National Air Force Museum of Canada in Trenton, Ontario. In 1997, LW682 was recovered from a bog near Geraardsbergen, Belgium. Halifax 57 Rescue was also involved the recovery and subsequent burial of three crew members. Parts were used to restore NA337, and the rest was melted down for the London RAF Bomber Command Memorial. and LW170 near Scotland. Once recovered, the plan is for HR871 to be moved to the Nanton, Alberta Bomber Command Museum of Canada for restoration. ==Specifications (Mk.III)==