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The de Havilland Mosquito was a Britishmarker combat aircraft that excelled in versatility during the Second World War. Originally conceived as an unarmed fast bomber, the Mosquito adapted to many other roles during the air war where it saw service in the European theatre, the Pacific theatre of Operations and the Mediterranean Theater, including: low to medium altitude daytime tactical bomber, high altitude night bomber, pathfinder, day or night fighter, fighter-bomber, intruder, maritime strike and fast photo reconnaissance aircraft carrying out aerial reconnaissance. It was also used as the basis for a single-seat heavy fighter, the de Havilland Hornet. Upon the Air Ministry's decision to enter the Mosquito into production in 1941, it was the fastest operational aircraft in the world.

Entering widespread service in 1942 the Mosquito supported RAF strategic night fighter defence forces in the United Kingdommarker from Luftwaffe raids, most notably defeating the German aerial offensive Operation Steinbock in 1944. Offensively the Mosquito units also conducted night time fighter sweeps in indirect and direct protection of RAF Bomber Command's bomber fleets to reduce RAF bomber losses in 1944 and 1945. The Mosquito increased German night fighter losses to such an extent the Germans were said to have awarded two victories for shooting one down.As a bomber it also took part in "special raids", such as pinpoint attacks on Prisoner-of-war camp, Gestapomarker or German intelligence and security force bases as well as tactical strikes in support of the British Army in the Normandy Campaign. Some Mosquitos also saw action in RAF Coastal Command during the Battle of the Atlantic, attacking Kriegsmarine U-Boat and transport ship concentrations, particularly in the Bay of Biscaymarker offensive in 1943 in which significant numbers of U-Boats were sunk or damaged.

The aircraft served with the Royal Air Force (RAF) and many other air forces during the Second World War and postwar. The Mosquito was known affectionately as the "Mossie" to its crews and was also known as "The Wooden Wonder" or "The Timber Terror" as the bulk of the aircraft was made of laminated plywood.

Design and development



Concept and design

Throughout the 1930s, de Havilland established a reputation in developing innovative high-speed aircraft such as the DH.88 Comet mailplane and DH.91 Albatross airliner that had already successfully employed the composite wood construction that the Mosquito would use. The firm had little experience of working with the Air Ministry, and when a contract was specified for new bombers, de Havilland's all-wood design approach was considered to be out of keeping with official policy.

The performance of the de Havilland designs were impressive. The construction of their aircraft compensated for the general low power of aero engines available at the time. The de Havillland DH.91 Albatross was capable of cruising at 210 mph (338 km/h) at 11,000 ft (3,350 m). The wooden construction and stressed skin covering not only saved weight and compensated for the low power engines, but simplified production and enabled a fast construction rate.The potential of the construction design could be seen in the design of the DH.88, which heavily influenced the design of the Mosquito. In October 1934, the purpose-built Comet Racer C-ACSS, Grosvenor House, flew the London-Melbourne Centenary Air Race. They completed the race, winning the competition flying 11,300 miles (18,180 km) in 70 hours 54 minutes and 18 seconds. Later the aircraft flew from Gravesend to Sydneymarker, Australia before flying to Blenheim, New Zealandmarker in 10 days, 21 hours, 22 minutes over a distance of 26,450 miles (42,566 km).

Just under two years later, de Havilland took an interest in Air Ministry specification P.13, issued on 8 September 1936 which asked for a twin-engined "medium bomber" suitable for "worldwide use" which could carry a 1,000 pound (450 kg) bombload for 1,000 miles while operating at and and a maximum 8,000 lb (3,630 kg) bombload. Their work on this specification led de Havilland to consider that a smaller aircraft could do the same job.. De Havilland were not invited to tender a design to P.13/36; the specification would lead to the Avro Manchester and Handley Page Halifax.

In 1937, the concept of a fast unarmed bomber including a design comparable to P.13/36, was put before the Air Ministry by Volkert of Handley Page. Within the RAF it had support as an idea worth pursuing in case the need appeared as well as raising concerns that the (economic) benefits over conventional bombers were marginal given the limited operational role it could play. The Ministry was also considering the maximum use of non-strategic materials for aircraft production, leading to the development of the Albemarle medium bomber which was largely constructed from spruce and plywood on a steel tube frame.

de Havilland wanted to go further than the P. 13 requirement and at first looked at bomber adaptions of existing designs, such as the Albatross airliner. Eventually however, de Havilland issued a new design for a twin-engine wood constructed bomber. It would be aerodynamically clean and powered by the Rolls-Royce Merlin engine which even at that early point, offered huge promise. The original plan of the Mosquito was to be faster than enemy fighter aircraft, and therefore would not need a defensive armament comprised of gun turrets, which in turn would slow it down and make interception more likely. This was in complete contradiction to contemporary RAF design philosophy, which required well-armed heavy bombers (it was much more akin to the German schnellbomber concept). The design received the designation DH.98.

The de Havilland design was deemed radical by the Air Ministry and received several rejections owing to the conflicting policy of the two (the RAF wanted heavy well-armed bombers). The last frontline operational aircraft the RAF had taken from de Havilland was the DH.9a.. The RAF required an aircraft that could act as a heavy bomber and a long range aircraft, had sufficient speed to reduce the time spent over defended airspace. The priority given to speed was emphasised and a design cabable of combining medium bomber capability, with reconnaissance ability and "general purpose classes" into one basic design. The design was also to be capable of maritime strike, and specifications for torpedo carrying equipment was also to be part of this new design. In addition the Ministry suggested two forward and two rear firing machine guns for defence.The Air Council then decided that further requirements, such as remotely controlled guns, and a top speed of 275 mph (442 km/h) at 15,000 ft (4,570 m) on two-thirds engine power and a range of 3,000 miles (4,830 km) with a 4,000 lb (1,810 kg) bomb load.

In April 1938, de Havilland's initial design had started off as an adaptation of the Albatross, armed with three gun turrets and a six-man crew, and powered by two Rolls-Royce Merlin engines. It would carry 6,000 lb (2,720 kg kg) of bombs to Berlinmarker and back at 11,000 ft (3,350 m). Geoffrey de Havilland was concerned that the Air Ministry would not allow a design constructed of wood carrying bombs 3,000 miles (4,830 km) in wartime. On 7 July, Geoffrey de Havilland sent a letter to Air Marshal Wilfred Freeman, an old friend of de Havilland since the First World War, and now the Air Council's member for Research and Development, for help in the case of opposition. Freeman gave the plans the green light.

The Albatross design produced would need at least a three man crew and six to eight forward firing guns and a couple of handheld defensive weapons with provision for a rear turret. All this produced a total weight of 19,000 lb (8,616 kg), a top speed of 300 mph (483 km/h) and cruise speed of 268 mph (431 km/h) at 22,500 ft (6,860 m). de Havilland considered this impossible for the time being, and expected the aero companies in Britain to struggle with the specifications of P.13/36. As it transpired, the Avro Manchester and Handley Page HP.56 were problematic designs due to the problems with the Rolls-Royce Vulture. Changing to four Merlins gave the successful Lancaster and Halifax.

Bishop sketched out the Mosquito at Salisbury Hall. Bishop had worked on the Comet under de Havilland's chief designer and the Albatross under A E Hagg.

Later development, the Mosquito design takes shape

The restrictive design features placed upon the P.13 specification prompted de Havilland to approach the medium bomber project with a radical new design. They decided to eradicate the defensive armament altogether as it would save one-sixth in total weight of the aircraft. In consequence production would be easier and faster with a delivery rate far in advance of any competition designs. Without armament, the crew could be kept at two, a pilot and navigator. The chief designer, Ronald Eric Bishop, made provision for the addition of 20 mm cannon installed in the nose. This was a feature (forward firing heavy armament) that was very successful in wartime.

The Air Ministry was not happy with de Havilland's proposals. They wanted a heavily-armed bomber to conform to their concept that heavily armed formations of bombers would make it through to their targets. On 27 July 1938, de Havilland distanced themselves further by stating the P.13 specification could not be met by a two Merlin engine aircraft unless the Air Ministry only wanted half of the 4,000 lb (1,810 kg) bomb load, then a larger and slower bomber would be needed.de Havilland pressed for their new design and during the Munich Crisis in September 1938, they presented their brand new design which was manned by two crew and powered by two Merlins without any defensive armament. Speed, de Havilland vowed, would be its defence. In the First World War, de Havilland was satisfied that the Airco DH.4 bomber was able to outpace the fighters of the day. The wood design would also shave a year off the time it would take to build a metal prototype.

In October 1938, the Ministry rejected de Havilland's proposal, sceptical about the idea of a wooden plane and the concept of the unarmed bomber. The Air Ministry were only interested in all metal bombers that could defend themselves with their heavy defensive armament. To accommodate them, de Havilland built a series of mock-ups with a turret installed in the fuselage armed with two machine guns. But other than this, de Havilland refused to change the fundamentals of their design.On 20 September 1939, de Havilland wrote to Freeman again:
We believe we can produce a twin-engined bomber which would have a performance so outstanding that little defensive equipment would be needed.
This would employ the well tried out method of construction used in the Comet and Albatross and being of a wood or composite construction would not encroach on the labour and material used in the expanding RAF.
It is especially suited to really high speeds because because all surfaces are smooth, free from rivets, overlapped plates and undulations and it also lends itself very rapid and subsequent production.


In November 1939, de Havilland were progressing through various schemes using different engines and considering the effects of defensive armament on their designs. A four-gun turret defence was possible with Griffon engines while keeping speed up. The Ministry were still supportive for the aircraft for development purposes but availability of engines and turrets would make production of any more than the prototypes impracticable. Rather than commit the design team to a single aircraft, fifty Merlin-engined DH.98 and two turreted prototypes were decided upon. At a meeting considering de Havilland's, Blackburn's and Bristol's fast bomber ideas in November, Wilfrid Freeman gained support for dH to be directed to produce a fast aircraft with increasing power, firstly with Merlin engines then RR Griffons and after that Napier Sabres.

Freeman was supportive and agreed to the lack of armament but doubted de Havilland's performance estimates which claimed a two crew wooden twin engine bomber could fly 1,500 miles (2,410 km) and at a speed faster than a Spitfire. He did believe, by using ducted air radiators and faired propeller roots, the aircraft could reduce drag to a large extent. Despite the agreement there was still strong opposition to a two crew bomber, the Air Ministry wanted at least a third crewman to reduce the workload of the others on long flights.

On 12 December 1939 the Vice-Chief of the Air Staff, Director General of Research and Development, Air Officer Commanding-in-Chief (AOC-in-C) of RAF Bomber Command met to thrash out the details of the design and its uses for future strategy. The AOC-in-C could not accept an unarmed bomber, but insisted it would be suited for reconnaissance missions with F24 cameras. On that day the Air Council ordered the DH.98 prototype built under specification B.1/40.

After more talks between the company and Air Ministry and operational commands, on 29 December 1939 the project received official backing when the Air Ministry asked for a "basic" bomber requirement for a bomber capable of carrying of 1,000 lb (450 kg) bomb load and with a range of 1,500 miles (2,410 km). Finally, on 1 January 1940 a further meeting, chaired by Air Marshal Wilfred Freeman took place with Geoffrey de Havilland, John Buchanan, Deputy of Aircraft Production and John Connolly, Buchanan's chief of staff. de Havilland claimed the Mosquito was the "fastest bomber in the world", and added "it must be useful". Freeman supported its production for RAF service and ordered a single prototype for an unarmed bomber variant to specification B.1/40/dh, and powered by two Merlin engines. The aircraft was to have a speed of 397 mph (639 kph) at 23,700 ft (7,220 m) and a cruising speed of 327 mph (527 kph) at 26,600 ft (8,110 m) with a 1,480 mile (2,380 km) range at 24,900 ft (8,500 m) on full tanks. Maximum service ceiling was to be 32,100 ft (9,780 m).

Project Mosquito

Air Marshal Roderic Hill ordered a contract for 50 DH.98 aircraft, including one prototype, which was finally placed under Specification B.1/40 on 1 March 1940. Design and prototype construction was able to begin almost immediately, but work was cancelled again after the Battle of Dunkirk in order to focus on existing types.

Instead, the Supermarine Spitfire, Hawker Hurricane, Vickers Wellington, and Bristol Blenheim aircraft got priority. It was decided there was no production capacity for aircraft like the DH.98, which was not expected to by in service until early 1941. This was mostly due to the shortage of Merlin engines which were needed in fighter aircraft. The Mosquito was only reinstated as a priority in July 1940 after de Havilland promised Lord Beaverbrook 50 machines by December 1941. de Havilland knew this was unlikely; only 20 Mosquitos were built that year. During this time Beaverbrook, as Minister for Aircraft Production, asked Air Marshall Freemann to cease work on the project. Freeman did not issue such an order but it seemed the project would be shut down when the design team were denied the materials with which to build their prototype. Only when Beaverbrook was satisfied that work would not divert effort from the repairing of Merlin engines and production of Tiger Moth trainers, was it allowed to continue.

The Battle of Britain raged while the prototypes were being built, and 25% of the factory time was lost in the bomb shelters. Nevertheless, the original day bomber prototype, W4050, was rolled out on 19 November 1940, and first flew on 25 November, only ten months after the go-ahead. The original estimates were that as the Mosquito prototype had twice the surface area and over twice the weight of the 1940 Spitfire Mk II, but also with twice its power, the Mosquito would end up being 20 mph (32 km/h) faster. Over the next few months, W4050 surpassed this estimate, easily besting the Spitfire Mk II in testing at RAF Boscombe Downmarker in February 1941 at a top speed of 392 mph (631 km/h) at 22,000 ft (6,700 m) altitude, compared to a top speed of 360 mph (579 km/h) at 19,500 ft (6,000 m) for the Spitfire. It also bested the Spitfire at low to medium altitude, some 6,000 ft (1,830m).

The Air Ministry was still not happy with the concept of the unarmed bomber. Nevertheless, in the aftermath of the Battle of Britain, interest in long-range heavy fighter and bomber destroyers began. The original 50 prototype order was changed to 20 bomber variants and 30 fighters; it was still uncertain whether the fighter version should have dual or single controls or should carry a turret so three prototypes were required. This caused some delays as half built wing components had to be strengthened for the expected higher combat load requirements. The nose sections also had to altered, from clear perspex, to solid noses designed to hold heavy air-to-air combat weapons.

Prototypes and test flights

Construction of a prototype Mosquito fighter version was carried out at the secret Salisbury Hall facility. The prototype was given the factory serial E-0234 and later allocated the military serial W4050.

During testing, it was found that the Mosquito day bomber prototype had the power and internal capacity to carry not the of bombs originally specified but four times more. In order to better support the higher loads the aircraft was capable of, the wingspan was increased from 52 ft 6 in (16.0 m) to 54 ft 2 in (16.5 m). It was also fitted with a larger tailplane in comparison to later production types, an improved exhaust system, and lengthened nacelles that improved stability. These modifications became standard across the production versions. The skin on the tail surfaces was all wood and plywood covered while the rudder and elevators were made of aluminium and the elevators fabric covered. In 1943 the elevators were covered in metal to increase speed in dives. The two Merlin 21 two-speed single stage supercharged engines were installed. The propellers were de Havilland Hydromatic constant speed three-blade airscrews.

On 3 November 1940 the aircraft was transported by road to Hatfield where it was placed in small blast proof assembly building where successful engine runs were made on 19 November. On 24 November 1940, taxying trials were carried out by Geoffrey de Havilland Jr who was the chief test pilot and responsible for maiden flights. The tests were successful and the prototype was subsequently readied for flight testing. On 25 November the aircraft made its first flight piloted by Geoffrey De Havilland Jr., who flew W4052 off a field beside the shed it was built in.The flight was made 11 months after the start of detailed design work, a remarkable achievement under the conditions of the time (without the assembly line method).

John E. Walker, Chief Engine Installation designer went with de Havilland. The take-off was "straight forward and easy". The undercarriage was not retracted until a considerable height was obtained. The aircraft reached 220 mph (354 km/h) and the only problem was the failure of the undercarriage doors to fully close. They remained open by some 12 in (31 cm) as speed increased. This problem persisted for some time. Another teething problem was the inability of the tailwheel to caster properly which caused the airframe in the rear fuselage to fracture during tests at Boscombe in 1941. This problem was solved in June - July 1941 by the fitting of a Dowty unit. The left wing of E-0234 had a tendency to drag to port slightly, so a rigging adjustment was carried out before further flights.



On 5 December 1940 the E-0234, now with the serial W4050, experienced tail buffeting at speeds of 240-255 mph (386-41-kph). The pilot noticed this most in the control column, and handling became more difficult. de Havilland explored the problem and came to the conclusion it was a stall generating, away from the engine nacelles and on the underside of the wing. The disturbed airflow was striking the tailplane causing the buffeting. Slots were fitted to smooth the air flow and deflect it from striking the tailplane with such force. Wool tufts were attached to the suspect areas as well during testing to investigate direction of airflow. The slots failed to achieve anything. The buffeting was eliminated by introducing stretched nacelles which extended back beyond the trailing edge of the wing, in February 1941. This meant the flaps had to be divided into inboard and outboard sections.

With teething problems largely solved, John Cunningham flew W4050 on 9 February 1941. He was greatly impressed by the lightness of the controls and generally pleasant handling characteristics". Cunningham concluded that when the type was fitted with radar it would be a perfect replacement for the Beaufighter.

During its trials the previous month, 16 January 1941, W4050, a bomber/reconnaissance aircraft outpaced a Spitfire at 6,000 ft (1,830 m). Over February the main priority was speed trials in level flight, during which it reached 390 mph (627 km/h) at 22,000 ft (6,700 m). Official trials began at Boscombe Down on 19 February which satisfied the de Havilland company. On 20 April 1941 it was demonstrated to Lord Beaverbrook, the Minister of Aircraft Production. The Mosquito made a series of flights including one rolling climb on one engine. Also present was General Henry H. Arnold and his aide, Major Elwood Quesda:
I do recall the first time I saw the Mosquito as being impressed by its performance, which we were aware of.
We were impressed by the appearance of the airplane that looks fast usually is fast, and the Mosquito was, by the standards of the time, an extremely well streamlined airplane, and it was highly regarded, highly respected.


The trials set up future production plans between Britain, Australia and Canadamarker. The Americans did not pursue their interest. It was thought the P-38 Lightning could handle the same duties just as easily. Arnold felt the design was being overlooked, and urged the strategic personalities in the United States Army Air Force to learn from the design if they chose not to adopt it. The USAAF then requested one airframe to evaluate, but this was only a few days before the Attack on Pearl Harbormarker, and the USAAF entered the war without a fast dual purpose reconnaissance machine.

W4051 was to be the second prototype, but an airframe fracture in W4050 meant that W4051's airframe was to used as a replacement. W5051 received a production standard fuselage and actually saw combat operations. W4050 flew on 10 June 1941, the third Mosquito after W4052, which flew on 15 May 1941. W4055 flew the first operational Mosquito flight on 17 September 1941.During the flight testing the Mosquito was fitted with a number of innovations. W4050 was fitted with a turret behind the cockpit for drag tests. It was not adopted and the idea was abandoned in July 1941. The W4052 had the first version of the Youngman Frill airbrake fitted to the fighter prototype. The frill was opened by bellows and venturi effect to provide rapid deceleration during interceptions and was tested between January - August 1942 but was abandoned when lowering the undercarriage, it was discovered, had the same effect.

The W4052 was extensively used as the fighter variant prototype. It differed from its bomber brethren in a number of ways. It was powered by an upgraded variant of the Merlin 21 of 1,460 hp (1,088 kW), it also had a flat bullet proof windshield. It was tested with powerful armament such as 40 mm cannon and other modifications, bomb racks, fuel drop tanks, barrage balloon cable cutters in the leading edge of the wings, Hamilton airscrews and braking propellers as well as drooping aileron systems which enabled a steep approaches and a larger rudder tab. The prototype continued to serve as a test machine until it was scrapped on 28 January 1946.

W4050 continued to be used for long and varied testing programs. In June 1942 it was powered by two Merlin 61s, a two-stage supercharger powerplant. It was used to eliminate problems on W4052. Most of this related to the former's exhaust and armament systems. Flash eliminators had to be fitted to the NF.II to prevent the crew from being blinded by muzzle flash during the firing of the weapons. The cooling intake shrouds that were to cool the exhausts overheated after a while. Flame dampers prevented the exhaust glow on night operations but they had an effect on performance. Multiple ejector and open ended exhaust stubs configuration ended the problem and were used in the PR.VIII, B.IX and B.XVI variants. This increased speed performance in the B.IX alone by 10-13 mph (16–21 km/h).

By the time testing was over and the Air Ministry had authorised mass production plans to be drawn up on 21 June 1941 the aircraft was the world's fastest operational aircraft. The Air Ministry authorised 19 PR. models and 176 fighters. A further 50 were unspecified. In July 1941 the Air Ministry confirmed these would be unarmed fast bombers. The Mosquito would enjoy its fastest aircraft status for another two and a half years. On 18 and 19 July 1941 M4050 was fitted with Merlin 61s and reached 433 mph (697 km/h) at 28,500 ft (8,690 m). Multiple ejector exhausts contributed to the increase in speed. On 20 October 1941 W4050 achieved a speed of 437 mph (703 km/h) in level flight. Using two-stage Merlin 77s, it reached 439 mph (706 km/h) in December 1943.

By the end of January 1942 contracts had been awarded for 1,378 Mosquitos of all variants, including 20 T.III trainers and 334 FB.VI bombers. Another 400 were to be built by de Havilland Canada.

Basic design (based on the FB Mk VI)

The Mosquito was a mid-wing (or shoulder-wing) aircraft powered by two Merlin engines. In the most produced variant, the FB 6 (Fighter-bomber Mark 6), two Merlin Mk 23 or Mk 25 engines driving three-bladed hydromatic propellers powered the aircraft.

Construction

The airframe was built mostly from wood. The oval-section fuselage was built in two halves in jigs over a mahogany or basic shape. The join was along the vertical centre line. The spilt construction greatly aided the assembly of the internal equipment as it allowed the technicians easy access. The fuselage construction joints were made from balsa wood and plywood strips. The spruce multi-ply was connected by a V joint, which was balsa made, along with the interior frame. The spruce would be reinforced by plywood strips at the point where the two halves joined to form the V joint. Located on top of the joint the plywood formed the outer skin. During the joining of the two halves ("boxing up"), two laminated wooden cramps would be used in the after portion of the fuselage to act as support.

The fuselage itself was separated by seven bulkheads made up of two plywood skins parted by spruce blocks, which formed the basis on each half for the outer shell. The bulkhead was a repeat of the spruce design for the fuselage halves; a balsa sheet sandwich between two plywood sheets/skins. Among the glues used was Casein resin plus many other screws and flanges (made of various woods) which held the structure together. After securing the two halves, the fuselage was covered with fabric and was then doped with cellulose dope which was either sprayed or brushed onto the surface. A coat of silver dope was then applied before exterior camouflage was applied. The underside was cut to allow for wing assembly.

The all wood wing was installed into the roots by means of four large attachment points. The wing was built as a one piece structure and was not divided into separate construction sections. It was made up of two main spars, spruce and plywood compression ribs, stringers and a plywood covering. The outer plywood skin was covered and doped like the fuselage. The engine radiators were fitted in the inner wing, just outboard of the fuselage on either side. These gave less drag. The radiators themselves were split into three sections: an oil cooler section outboard, the middle section forming the coolant radiator and the inboard section serving the cabin heater. The wing contained metal framed and skinned ailerons but the flaps were made of wood and were hydraulically controlled. The nacelles were mostly wood, but the engine mounts were all metal as were the undercarriage parts (for strength). The outer leading wing edge had to be brought 22 in. (55 cm) further forward to accommodate this design. The main tail unit was all wood built. The control surfaces, the rudder and elevator were aluminium framed and fabric covered.

Fuel, landing gear, electrical power and armament systems

The main landing gear were housed in the nacelles behind the engines. These were raised and lowered hydraulically. The main landing gear shock absorbers were of the rubber in compression type with twin pneumatic brakes for each wheel. The tailplane wheel was retractable.

The fuel systems allowed the light Mosquito frame to obtain a considerable range. There were nine fuel tanks. The two in the outer wing, the "outer tanks", each contained 58 gallons of fuel. The two inner wing fuel tanks, located between the wing root and engine nacelle contained 143 gallons of fuel each. The central tank mounted in the fuselage between bulkhead number two and three aft of the cockpit, consisted of two 25 gallon fuel tanks. The total fuel load of 452 gallons was initially deemed appropriate for the type. The range could be increased further; the Mk 6 could have larger fuselage tanks, increasing the capacity of the fuselage from 50 to 63 gallons. Two 100 gallon fuel cells were added under the wings to increase the total to 715 gallons. Both the inner wing, and fuselage tanks are listed as the "main tanks".The central and inner wing tanks were pressurised to reduce fuel vaporisation at high altitude; a feature needed in the photographic reconnaissance variants. The pressure venting cock located behind the pilots seat controlled the pressure valve; as the altitude increased the valve increased the volume applied by a pump. This system was extended to include field modifications of the fuel tank system.The engine oil tanks were in the engine nacelles. Each nacelle contained a 15 gallon oil tank including a 2.5 gallon air space. The oil tanks themselves had no separate coolant controlling systems. The coolant header tank was in the forward nacelle, behind the propeller. The remaining coolant systems were controlled by the coolant radiators shutters in the forward inner wing compartment, in between the nacelle and the fuselage and behind the main engine cooling radiators which were fitted in the leading edge. Electric-pneumatic operated radiator shutters directed and controlled airflow through the ducts and into the coolant valves to predetermined temperatures.

A later Mosquito variant showing the air and oil coolant radiators in the leading edge of the wing.
The leading edge was split into two between the engine nacelle and the fuselage


Electrical power came from a 24 volt DC generator on the starboard (No. 2) engine and an alternator on the port engine which supplied AC power for radios.. The radio shutters, superchargers, gun camera, bomb bay, bomb/rocket release and all the other crew controlled instruments were powered by a 24 volt battery.

The radio communication devices included VHF and HF communications, GEE navigation and IFF and G.P devices.

The design of the Mark VI allowed for a provisional long-range fuel tank to increase range for action over enemy territory, for the installation of bomb release equipment specific for depth charge explosives for strikes against enemy shipping, or for the simultaneous use of rocket projectiles and a 100 gallon drop tank under each wing for a 200 gallon supplement to the main fuel cells. The FB 6 had a wingspan of 54 ft 2 in (16.51 m), a length (over guns) of 41 ft 2 in. (12.55 m). It had a maximum speed of 378 mph (608 km/h) at 13,200 ft (4,023 m). Maximum take-off weight was 22,300 lb (10,124 kg) and the range of the aircraft was 1,120 miles (1,802 km) with a service ceiling of 26,000 ft (7,925 m).

Its armament was a four Browning .303 machine guns and four 20 mm Hispano cannons for air and soft ground targets. Its bomb load consisted of 2,000 lb (907 kg) of bombs or eight RP-3 unguided rockets.

Performance

Due to the design and light frame, the Mosquito had a low stall speed of 105 knots with undercarriage and flaps raised. When both were lowered, the stall speed decreased to 90 - 100 knots. Stall speed at normal approach angle and conditions was 90 - 95 knots. Warning of the stall was given by buffeting and would occur 10 knots before stall was reached. The conditions and impact of the stall were not severe. The wing did not drop unless the control column was pulled back. The nose drooped gently and recovery was easy.For cruising the maximum speed for obtaining maximum range was 170 knots at 17,000 lb weight.The design was noted for having light and effective control surfaces which allowed for good manoeuvrability. It was noted that the rudder should not be used aggressively at high speeds and the poor aileron control at low speeds when landing and taking off was also a problem. For flying at low speeds the flaps had to be set at 15°, speed reduced to 175 knots and rpm set to 2,650. Speed could be reduced to the acceptable 130 knots for low speed flying.

Variants

Prototypes

A Mosquito PR41 restored to display standard at the Australian War Memorial.
Three prototypes were built, each with a different configuration. The first to fly was the bomber prototype W4050 on 25 November 1940, followed by the night fighter model on 15 May 1941 and the photo-reconnaissance model on 10 June 1941.

Photo-reconnaissance aircraft

The photo-reconnaissance prototype became the basis for the Mosquito PR Mk I. The first operational sortie by a Mosquito was made by a PR Mk I on 17 September 1941 (the Bomber Mk IV entered service in May 1942 with No. 105 Squadron). On the very first mission, the unarmed Mosquito PR. I outpaced three Messerschmitt Bf 109s that attempted to engage the aircraft at 23,000 ft (7,000 m).The Mosquito PR Mk IV was 27 Mosquito B. Mk IV bombers, converted into two-seat photo-reconnaissance aircraft. The type first flew in April 1942.The Mosquito PR Mk VIII was the next photo-reconnaissance version. It was to fill as an interim solution until Mk PR IX and XVI models were available in large numbers. The VIII was based on the IV but it was powered by two Rolls-Royce 61 engines in place of Merlin 21/22s. It first flew on 20 October 1941. The four built were converted from B. IVs.The Mosquito PR Mk IX was another unpressurized version without any armament. It first flew on 24 March 1943; 54 were built in total. It was based on the Mosquito B.Mk IX bomber aircraft. Powered by two 1,680 hp (1,253 kW) Merlin 72/73 or 76/77 engines. It could carry either two 50 gallon (230 litre), two 100 gallon (455 litre) or two 200 gallon (910 litre) droppable fuel tanks. In total 90 were built.

The Mosquito PR Mk XVI had a pressurised cockpit and three additional fuel tanks in the bomb bay. It was powered by two Rolls-Royce Merlin 72/73 or 76/77 piston engines. 435 of these were built.The Mosquito PR Mk 32 was a long-range, high-altitude pressurized photo-reconnaissance version. It was powered by a pair of two-stage supercharged 1,960 hp (1,260 kW) Rolls-Royce Merlin 113 and Merlin 114 piston engines. The Merlin 113 on the starboard side and the Merlin 114 on the port. First flown in August 1944, only five were built and all were conversions from PR. XVIs.The Mosquito PR Mk 34 and PR Mk 34A was a very long-range unarmed high altitude photo-reconnaissance version. The fuel tank and cockpit protection armour were removed. Addition fuel was carried in a bulged bomb-bay: 1,192 gallons which was the equivalent of 5,419 miles. A further two 200 gallon (910 litre) drop tanks under the outer wings gave a range of 3,600 miles (5,800 km) cruising at 300 mph (480 km/h). Powered by two 1,690 hp (1,259 kW) Merlin 114s first used in the PR. 32. The port Merlin 114 drove a Marshal cabin supercharger. 181 were built including 50 built by Percival Aircraft Company at Lutonmarker.All PR. 34s were installed with four split F.52 vertical cameras, two forward, two aft of the fuselage tank and one F.24 oblique camera. Sometimes a K.17 camera was used for air surveys. In August 1945 the PR.34A was the final photo-reconnaisance variant with one Merlin 113A and 114A each delivering 1,710 hp (1,274 kW).

Bombers

On 21 June 1941 the Air Ministry ordered that the last ten Mosquitos, ordered as PR aircraft, should be converted to bomber use. These ten machines were part of the original 1 March 1940 production order. These became the B.IV Series I. Aircraft W4072 was to be the prototype. It flew for the first time on 8 September 1941. The 50 B.IV series II bombers differed from the series I in having a larger bomb bay to increase the payload to four 500 lb bombs instead of four 250 lb (115 kg) bombs of Series I. This was made possible by shortening the stabilizer of the 500 lb (230 kg) bomb so that these four larger weapons could be carried.

The bomber prototype led to the B Mk IV, of which 273 were built. The B Mk IV could accommodate four 500 lb bombs, or a 2,000 lb (227 kg) total load in the bomb bay. Some of these variants were later converted for special operations with the Highball anti-shipping weapon. A B.IV was used a trials aircraft for the bomb. In RAF Bomber Command 54 B.IVs were modified to have bulged bomb bays to carry a 4,000 lb (1,812 kg) High explosive bomb to operate as a light night-striking force.

A Mosquito B.IX also holds the record for the most combat missions flown by an Allied bomber in the Second World War. LR503, known as "F for Freddie" because of its squadron code letters, GB*F, first served with 109 and subsequently 105 Squadron of the RAF. It flew 213 sorties during the war, only to crash at Calgary airport during the 8th Victory Loan Bond Drive on 10 May 1945, two days after VE Day, killing both the pilot, Flt. Lt. Maurice Briggs, DSO, DFC, DFM and navigator Fl. Off. John Baker, DFC and Bar.

Fighter Aircraft

Developed during 1940, the Mosquito F Mk II was developed and the first prototype was completed on 15 May 1941. These aircraft were fitted with four 20 mm (.79 in) Hispano cannon in the fuselage belly and four .303 in (7.7 mm) Browning machine gun mounted in the nose. This fit required the movement of the crew ingress/egress door from the bottom to the right side of the nose. The aircraft also featured a modified windscreen, with flat bulletproof panels in front,.

Night fighter aircraft

The first production night fighter Mosquitos were designated the Mosquito NF Mk II. A total of 466 were built with the first entering service with No. 157 Squadron in January 1942, replacing the Douglas Havoc. These aircraft were similar to the F Mk II, but were fitted with the AI Mk IV metric wavelength radar. The herring-bone transmitting antenna was mounted on the nose and the dipole receiving antennae were carried under the outer wings. A number of NF IIs had their radar equipment removed and additional fuel tanks installed for use as night intruders. These aircraft, designated NF II (Special) were first used by 23 Squadron in operations over Europe in 1942. No. 23 Squadron was then deployed to Malta on 20 December 1942, and operated against targets in Italy.

Ninety-seven NF Mk IIs were upgraded with centrimetric AI Mk VIII radar and these were designated the Mosquito NF.Mk XII. The Mosquito NF Mk XIII, of which 270 were built, was the production equivalent of the Mk XII conversions. The centimetric radar sets were mounted in a solid "thimble" (Mk XII / XIII) or "bull nose" (Mk XVII / XIX) radome, which required the machine guns to be dispensed with. The other night fighter variants were the Mk XV, Mk XVII (converted Mk IIs), Mk XIX and Mk 30. The last three marks mounted the U.S.marker-built AI Mk X radar.

  • Mosquito NF Mk X: Unbuilt night fighter version.
  • Mosquito NF Mk XI: Unbuilt night fighter version.
  • Mosquito NF Mk XIV: Unbuilt night fighter version.
  • Mosquito NF Mk XV: This designation was given to five Mosquito B.Mk IV bombers, which were converted into two-seat high-altitude night fighters.
  • Mosquito NF Mk XVII: Designation for 99 NF.II conversions, with single-stage Merlin 21, 22, or 23 engines, but British AI.X (US SCR-720) radar.
  • Mosquito NF Mk XIX: Improved version of the Mosquito NF XIII night fighter aircraft. It could be fitted with American or British AI radars. 220 built.
  • Mosquito NF Mk 30: High-altitude night fighter version. Powered by two 1,710 hp (1,275 kW) Roll-Royce Merlin 76 piston engines, enabling a top speed at . It also carried early electronic countermeasures equipment. 526 built.
  • Mosquito NF Mk 31: Unbuilt night fighter version.


After the war, two more night fighter versions were developed, the NF Mk 36 and the NF Mk 38.

  • Mosquito NF Mk 36: Similar to the Mosquito NF.Mk 30, but fitted with the American-built AI.Mk X radar. Powered by two 1,690 hp (1,260 kW) Roll-Royce Merlin 113/114 piston engines. 266 built.
  • Mosquito NF Mk 38: Similar to the Mosquito NF.Mk 30, but fitted with the British-built AI Mk IX radar. 50 built.


To warn German night fighters that they were being tracked by these radars , the Germans introduced Naxos ZR radar detectors.

Mosquito night intruders of No. 100 Group RAF, Bomber Command, were also fitted with a device called "Serrate" to allow them to track down German night fighters from their Lichtenstein B/C and SN-2 radar emissions, as well as a device named "Perfectos" that tracked German IFF signals.

Fighter-bomber aircraft

The most numerous Mosquito variant was the FB Mk VI fighter-bomber of which 2,298 were built, some one-third of Mosquito production. The protoype was converted from a B.VI first flew in February 1943.

The FB Mk VI was powered by two 1,460 hp (1,088 kW) Merlin 21s or 1,635 hp (1,218 kW) Merlin 25s. It first flew on 1 June 1942. Some 19 that were built by Airspeed Ltd were eventually modified to be completed as FB.XVIIIs. Two were converted to TR.33 maritime assault prototypes. The variant was generally armed with four 20 mm cannon and four .303 (7.7 mm) machine guns for hitting soft ground targets. The main hitting power came from the two 250 lb (115 kg) bombs enclosed in the bomb bay plus more and was later plus two RP-3 "60 lb" rockets to carry out anti-shipping strikes. Other variations of armament fixtures could have entailed eight 60 lb (27 kg) rockets in place of any other internal load. Later the main bomb load was upgraded to two 500 lb (230 kg) bombs. Alternatively, a third option could have been an aerial mine or depth charge for attacking German submarines.

The FB Mk VI proved durable in dogfights with single-engine fighter aircraft. Retaining the forward firing armament Mosquito FB Mk VIs of No. 143 Squadron RAF were engaged by 30 Focke-Wulf Fw 190s from Jagdgeschwader 5 on 15 January 1945. In the ensuing battle the Mosquitos lost five aircraft but shot down five Fw 190s in return as well as sinking an armed trawler and two merchant ships.

Other fighter-bomber variants were the Mosquito FB Mk XVIII (sometimes known as the Tsetse) of which 18 were built and a total of 27 were made by converting Mk VIs. These were fitted with a Molins "6-pounder Class M" cannon, a modification of the QF 6-pounder anti-tank gun weighing 1,580 lb (716 kg) fitted with an auto-loader to allow both semi- or fully-automatic fire, in the nose, along with two .303 in (7.7 mm) sighting machine guns. The cannon was later deleted. The Air Ministry initially suspected that this variant would not work, but mock tests proved otherwise. Although the gun provided the Mosquito with yet more anti-shipping firepower for use against U-boats it required a steady, and hence vulnerable, approach-run to aim and fire the gun. In comparison, rockets were more effective, especially because the 6-pounder was a significant weight penalty. The gun carried 24 rounds for the 6 pounder which had a muzzle velocity of 2,950 ft/s (900 m/s). The guns had an excellent range, some 1,800 - 1,500 yards (1,650 - 1,370 m). The gun was sensitive to sidewards movement and an attack required a dive from 5,000 ft (1,520 m) at a 30° angle with the Turn and bank indicator on centre. A move during the dive could jam the cannon.The prototype was converted from a FB.VI and was first flown on 8 June 1943.

The effect of the new weapon was demonstrated on 10 March 1944 when four Mk VIs escorting XVIIIs from 248 Squadron engaged a German convoy of one U-Boat and four destroyers, protected by 10 Ju 88s. Three of the Ju 88s were shot down. Pilot Tony Phillips destroyed one Ju 88 with four shells, one of which tore the engine off the Ju 88. The U-Boat was damaged. On 25 March U-976 was sunk by Molins-equipped Mosquitos. On 10 June, U-821 was abandoned in the face of intense air attack from No. 248 Squadron, and was later sunk by a Liberator of No. 206 Squadron. On 5 April 1945 Molins Mosquitos again demonstrated their value and attacked five German surface ships in the Kattegatmarker and set all of them on fire and sinking. The Sperrbrecher was lost with all hands, some 200 bodies being recovered by Swedishmarker vessels. Some 900 German soldiers died in total. On 9 April German U-Boats U-804, U-843 and U-1065 were spotted in formation heading for Norwaymarker. All were sunk. U-251 and U-2359 followed on the 19 April and 2 May 1945.

Despite the preference for rockets, a further development of the idea was carried out using the even larger 32-pounder, a gun based on the QF 3.7 inch AA gun designed for tank use, the airborne version using a novel form of muzzle brake. Developed to prove the feasibility of using such a large weapon in the Mosquito, this installation was not completed until after the war when it was flown and fired in a single aircraft without problems before being scrapped. The FB Mk 26 and FB Mk 40, based on the Mk VI, were built in Canadamarker and Australia and were powered by later versions of the Packard-built Merlin engines. The FB.26 was the Canadian variant version of the VI and improved from the FB.21. Two 1,620 hp (1,207 kW) single stage Packard built Merlin 225s. Some 300 were built and another 37 converted to T.29 standard. 212 FB.40s were built by versions of FB.VI were produced by de Havilland Australia. Six were converted to PR.40; 28 to PR.41s one to FB.42 and 22 to T.43s tactical assault aircraft. Most units were powered by Packard-built Merlin 31 or 33s.

All the fighter variants shared a number of common features. They had a flat, single-piece armoured windscreen and the pilot was provided with a fighter-style control stick rather than a wheel. The guns in the nose also meant that the bomber variants' entry hatch in the nose had to be relocated to a door on the starboard side, forward of the leading edge.

Training aircraft

The Mosquito was also built as a trainer.
  • Mosquito T Mk III : Two-seat training version. Powered by two Rolls-Royce Merlin 21 piston engines. 348 of the T Mk III were built for the RAF and Fleet Air Arm. de Havilland Australia built 11 T Mk 43 trainers, similar to the Mk III.


Torpedo reconnaissance fighter aircraft

To meet specification N.15/44 for Royal Navy use, de Havilland produced a carrier-borne variant. This resulted in 50 Sea Mosquito TR Mk 33s which featured folding wings, a thimble nose radome and fuselage hardpoints for mounting aerial torpedoes. These were followed by 14 Sea Mosquito TR Mk 37s, which differed in having ASV Mk. XIII radar instead of the TR.33's AN/APS-6.

Target tug aircraft

The Royal Navy also operated the Mosquito TT Mk 39 for target towing. A number of B Mk XVIs bombers were converted into TT.Mk 39 target tug aircraft. The RAF's target tug version was the Mosquito TT Mk 35 which were the last aircraft to remain in operational service, finally being retired in 1956.

Foreign variants

Canadian-built aircraft

A total of 1,133 (to 1945) Mosquitos were built by De Havilland Canada at Downsview Airfield in Downsview Ontario (now Downsview Park in Toronto Ontario).
  • Mosquito B Mk VII : Canadian version based on the Mosquito B Mk V bomber aircraft. Powered by two 1,418 hp (1,057 kW) Packard Merlin 31 piston engines, 25 built.
  • Mosquito B Mk XX : Canadian version of the Mosquito B Mk IV bomber aircraft, 145 built, of which 40 were converted into F-8 photo-reconnaissance aircraft for the USAAF.
  • Mosquito FB Mk 21 : Canadian version of the Mosquito FB Mk VI fighter-bomber aircraft. Powered by two 1,460 hp (1,089 kW) Rolls-Royce Merlin 31 piston engines, three built.
  • Mosquito T Mk 22 : Canadian version of the Mosquito T Mk III training aircraft.
  • Mosquito B Mk 23 : Unused designation for a bomber variant.
  • Mosquito FB Mk 24 : Canadian fighter-bomber version. Powered by two 1,620 hp (1,208 kW) Rolls-Royce Merlin 301 piston engines, two built.
  • Mosquito B Mk 25 : Improved version of the Mosquito B Mk XX Bomber aircraft. Powered by two 1,620 hp (1,208 kW) Packard Merlin 225 piston engines, 400 built.
  • Mosquito FB Mk 26 : Improved version of the Mosquito FB Mk 21 fighter-bomber aircraft. Powered by two 1,620 hp (1,208 kW) Packard Merlin 225 piston engines, 338 built.
  • Mosquito T Mk 27 : Canadian-built training aircraft.
  • Mosquito T Mk 29 : A number of FB Mk 26 fighters were converted into T Mk 29 trainers.


Australian-built aircraft

  • Mosquito FB Mk 40 : Two-seat fighter-bomber version for the RAAF. Powered by two 1,460 hp (1,089 kW) Roll-Royce Merlin 31 piston engines. A total of 178 built in Australia.
  • Mosquito PR Mk 40 : This designation was given to six FB Mk 40s, which were converted into photo-reconnaissance aircraft.
  • Mosquito FB Mk 41 : Two-seat fighter-bomber version for the RAAF. A total of 11 built in Australia.
  • Mosquito PR Mk 41 : Two-seat photo-survey version for the RAAF. A total of 17 built in Australia.
  • Mosquito FB Mk 42 : Two-seat fighter-bomber version. Powered by two Rolls-Royce Merlin 69 piston engines. One FB Mk 40 aircraft was converted into a Mosquito FB Mk 42.
  • Mosquito T Mk 43 : Two-seat training version for the RAAF. A total of 11 FB Mk 40s were converted into Mosquito T Mk 43s.


Production

The bulk of the Mosquito was made of custom plywood. The fuselage was a frameless monocoque shell made of sheets of Ecuadorean balsawood sandwiched between sheets of Canadian birch, but in areas needing extra strength—such as along cut-outs—stronger woods replaced the balsa filler. The plys were formed to shape by band clamps over large concrete moulds, each holding one half of the fuselage, split vertically. While the casein-based glue in the plywood dried, carpenters cut a sawtooth joint into their edges while other workers installed the controls and cabling on the inside wall. When the glue was completely dried, the two halves were glued and screwed together. A covering of doped Madapolam (a fine plain woven cotton) fabric completed the unit. The fuselage could be made in a week by six technicians.

Factory fresh Mosquito B.XVI aircraft
The wings were similar but used different materials and techniques. The main wing was built as a single unit. To form the basic shape, two birch plywood box spars were connected by plywood ribs, and stringers spanned the ribs. The skinning was also birch plywood, one layer thick on the bottom and doubled up on the top; between the two top layers was another layer of fir stringers. Building up the structure used an enormous number of brass screws, 30,000 per wing. The wing was completed with wooden flaps and aluminium ailerons.

When both parts were complete the fuselage was lowered onto the wing, and once again glued and screwed together. The remainder consisted of wooden horizontal and vertical tail surfaces, with aluminium control surfaces. Engine mounts of welded steel tube were added, along with simple landing gear oleos filled with rubber blocks. Wood was used to carry only in-plane loads, with metal fittings used for all triaxially loaded components such as landing gear, engine mounts, control surface mounting brackets, and the wing-to-fuselage junction. The total weight of metal castings and forgings used in the aircraft was only .

The glue used was initially casein-based. After a series of unexplained crashes of aircraft operating in tropical climates, this was changed to "Aerolite", a synthetic urea-formaldehyde adhesive developed by Dr. Norman de Bruyne at Aero Research Limited (ARL), which was better able to resist deterioration in high humidity conditions. De Havilland also pioneered the use of radio frequency heating to accelerate curing of the adhesive.

In England, fuselage shells were mainly made by the furniture companies Ronson, E. Gomme, Parker Knoll and Styles & Mealing. The specialized wood veneer used in the construction of the Mosquito was made by Roddis Manufacturing in Marshfield, Wisconsinmarker, United States. Hamilton Roddis had teams of dexterous young women ironing the (unusually thin) strong wood veneer product before shipping to the UK. Wing spars were made by J.B. Heath and Dancer & Hearne. Many of the other parts, including flaps, flap shrouds, fins, leading edge assemblies and bomb doors were also produced in High Wycombe, Buckinghamshire, which was well suited to these tasks due to a well established furniture-manufacturing industry. Dancer & Hearne processed much of the wood from start to finish, receiving timber and transforming it into finished wing spars at their High Wycombemarker factory.

Production
Producer and site Number built
de Havilland Hatfield, Hertfordshiremarker 3,326
de Havilland Leavesden, Hertfordshire 1,476
Standard Motor Company, Coventrymarker 1,066
Percival Aircraft Company, Lutonmarker 245
Airspeed Aircraft, Portsmouthmarker 122
de Havilland Hawardenmarker, Chestermarker 96
de Havilland Canada, Torontomarker 1,076
de Havilland Australia, Sydneymarker 212


About 5,000 of the 7,781 Mosquitos made contained parts made in High Wycombe. In Canada, fuselages were built in the Oshawa, Ontariomarker plant of General Motors of Canada Limited. These were shipped to De Havilland of Canadamarker in Toronto for mating to fuselages and completion. De Havilland Australia started construction in Sydney. These production lines added 1,076 from Canada and 212 from Australia.

Total Mosquito production was 7,781 of which 6,710 were built during the war. The ferry operation of the Mosquito from Canada to the war front was problematic, as a small fraction of the aircraft would mysteriously disappear over the mid-Atlantic. The theory of "auto-explosion" was offered, and, although a concentrated effort at de Havilland Canada to address production problems with engine and oil systems reduced the number of aircraft lost, it was unclear as to the actual cause of the losses. The company introduced an additional five hours flight testing to "clear" production aircraft before the ferry flight. By the end of the war, nearly 500 Mosquito bombers and fighter-bombers were delivered successfully by the Canadian operation.

In total, both during the war and post war, de Havilland exported 46 FB.V1 and 29 PR.XVI to Australia, two FB.VI and 18 NF.30s to Belgiummarker, approximately 205 FB.26, T.29, T.27s to Nationalist China, 19 FB.VIs to Czechoslovakiamarker in 1948, 6 FB. VIs to Dominicamarker, a few B.IVs, 57 FB.VI, 29 PR.XVIs and 23 NF.XXX to Francemarker. Some T.IIIs were exported to Israelmarker along with 60 FB.VIs, and at least 5 PR.XVIs and 14 naval versions. Four T.IIIs, 76 FB.VIs, one FB.40 and four T.43s were exported to New Zealandmarker. Three T.IIIs were exported to Norwaymarker, and 18 FB.VIs which were later converted to night fighter standard. South Africa received two F.II and 14 PR.XVI/XIs and Swedenmarker received 46 NF.XIXs. Turkeymarker received 96 FB.VIs and several T.IIIs, and Yugoslavia had 60 NF.38s, 80 FB.VIs and three T.IIIs delivered.

Operational history

The de Havilland Mosquito operated in many roles during the Second World War. Mosquito equipped squadrons were asked to perform medium bomber, reconnaissance, tactical strike, anti-submarine warfare and shipping attack and Night fighter duties, both defensive and offensive until the end of the war.

Mosquitos were widely used by the RAF Pathfinder Force which marked targets for night-time strategic bombing. Despite an initially high loss rate, the Mosquito ended the war with the lowest losses of any aircraft in RAF Bomber Command service. Post war, the RAF found that when finally applied to bombing, in terms of useful damage done, the Mosquito had proved 4.95 times cheaper than the Lancaster

Special Luftwaffe units (Jagdgeschwader 25 and Jagdgeschwader 50) were formed to combat the Mosquito attacks, though they were rather unsuccessful. Hermann Göring ordered the formation of the units in response to the "political humiliation" in April 1943. JG 25 and JG 50 were to be commanded by Oberstleutnant Herbert Ihlefeld and Major Hermann Graf. The units were "little more than glorified squadrons and achieved little against the elusive RAF aircraft". To cover the Luftwaffe's impotence the units were given great propaganda value by German propaganda. Walter Grabmann stated that the units were not worth the expenditure in light of the results they obtained.

The Mosquito famously annoyed the Commander in Chief of the Luftwaffe, Reichsmarschall Hermann Göring, when on the 20 January 1943, the tenth anniversary since the Nazis seizure of power, a Mosquito attack knocked out the main Berlin broadcasting station putting his speech off air. Göring complained about the high speed of the aircraft and its wooden structure, built by a nation he perceived to have large amounts of metal reserves, while the Germans had shortages of such materials and could not produce such a design.

The Mosquito operated in both defensive and offensive operations for the duration of the war. The Mosquito flew its last official European war mission on 21 May 1945, when Mosquitos of 143 Squadron and 248 Squadron RAF were ordered to continue to hunt German submarines that might be tempted to continue the fight. Only passive E-Boats were encountered.

Some of the most successful RAF pilots flew the Mosquito. Night fighter pilots Wing Commander Branse Burbridge claimed 21 kills, Bob Braham claimed some of his 29 kills in a Mosquito.

Operators





Survivors

There are approximately 30 surviving examples around the world with several under restoration. The largest collection on Mosquitos is at the de Havilland Aircraft Heritage Centremarker, which owns three aircraft. Three are currently under restoration to fly including one owned by Jerry Yagen, crafted by Glynn Powell in Aucklandmarker, New Zealandmarker.

Specifications

DH.98 Mosquito F. Mk II

DH.98 Mosquito B Mk XVI

Mosquito P.R.34


Popular culture

De Havilland Mosquitos feature prominently in the 1964 film 633 Squadron alongside actors Cliff Robertson and Harry Andrews. The film was notable for its use of genuine, airworthy aircraft, rather than models, for many of the scenes.

Mosquitos also play the title role of the 1969 film Mosquito Squadron, starring David McCallum and Charles Gray.

The Mosquito also appeared in the 1954 film The Purple Plain starring Gregory Peck and Bernard Lee, and although the aerial scenes were shot using models, the take-offs and ground scenes were shot using RAF aircraft.

See also

References

Notes


Bibliography


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    • Second revised and updated edition published 1995 by Crécy Books Ltd, ISBN 0-947554-41-6.
  • Sweetman, Bill and Rikyu Watanabe. Mosquito. London: Jane's Publishing Company Ltd., 1981. ISBN 0-7106-0131-X.
  • Thirsk, Ian.de Havilland Mosquito: An Illustrated History Volume 2. Manchester, UK: Crécy Publishing Limited, 2006. ISBN 0-85979-115-7.


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