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97-481: The de Havilland DH.89 Dragon Rapide is a 1930s short-haul biplane airliner developed and produced by British aircraft company de Havilland . Capable of accommodating 6–8 passengers, it proved an economical and durable craft, despite its outdated plywood construction. Developed during the early 1930s, the Dragon Rapide was essentially a smaller, twin-engined version of the four-engined DH.86 Express , and shared

194-559: A Scots term for a school teacher. Hundreds of additional Dominies were also constructed during the war. Other Rapides continued to be operated by British airlines throughout the war under the auspices of the Associated Airways Joint Committee (AAJC). Postwar, many military aircraft were returned to civilian service. Shortly after the end of the Second World War, de Havilland introduced a Dragon Rapide replacement,

291-411: A monoplane is its ability to combine greater stiffness with lower weight. Stiffness requires structural depth and where early monoplanes had to have this provided with external bracing, the biplane naturally has a deep structure and is therefore easier to make both light and strong. Rigging wires on non-cantilevered monoplanes are at a much sharper angle, thus providing less tension to ensure stiffness of

388-519: A "private venture" (PV). This would then be offered to the ministry for evaluation. The ministry may well release a specification based on the private venture aircraft if the plane aroused interest from the RAF or the ministry due to its performance or some other combination of features. The system of producing aircraft to a specification ran from 1920 to 1949 during which the Air Ministry was replaced by first

485-463: A basic mark number system. Mk 1 aircraft were those constructed pre-war, while Mk 2 and Mk 3 Rapides were ex-military conversions to a six-passenger cabin and eight-passenger cabin respectively. Those Rapides that were re-engined with a pair of de Havilland Gipsy Queen engines, were referred to as Mk 4s. These had an improved climb, cruise speed and single engine performance, but an increased all-up weight of 6,000 pounds (2,700 kg). By 1966, use of

582-426: A biplane has the wings positioned directly one above the other. Moving the upper wing forward relative to the lower one is called positive stagger or, more often, simply stagger. It can increase lift and reduce drag by reducing the aerodynamic interference effects between the two wings by a small degree, but more often was used to improve access to the cockpit. Many biplanes have staggered wings. Common examples include

679-608: A documented jet-kill, as one Lockheed F-94 Starfire was lost while slowing down to 161 km/h (100 mph) – below its stall speed – during an intercept in order to engage the low flying Po-2. Later biplane trainers included the de Havilland Tiger Moth in the Royal Air Force (RAF), Royal Canadian Air Force (RCAF) and others and the Stampe SV.4 , which saw service postwar in the French and Belgian Air Forces. The Stearman PT-13

776-446: A downwards-facing recognition light and metal propellers could be fitted as options. From 1937, to signify the fitting of improved trailing edge flaps, aircraft thus equipped were accordingly re-designated as DH.89A ; earlier-built Rapides were commonly retrofitted to this standard during their service life as well. During July 1934, the first production Rapide, G-ACPM , performed the type's public debut at Hatfield with its entry into

873-509: A faster and more comfortable successor to the Dragon. As the available engine power and speed increased, the drag penalty of external bracing increasingly limited aircraft performance. To fly faster, it would be necessary to reduce external bracing to create an aerodynamically clean design; however, early cantilever designs were either too weak or too heavy. The 1917 Junkers J.I sesquiplane utilized corrugated aluminum for all flying surfaces, with

970-513: A fleet of Rapides on scheduled services from Ronaldsway Airport near Castletown to airports in north-west England including Blackpool, Liverpool and Manchester. Some of its aircraft had been transferred to it after operation by Railway Air Services. During late 1935, the first of an initial batch of 16 Rapides were shipped to the manufacturer's Canadian branch, de Havilland Canada , for modification and re-sale purposes. Canadian aircraft received various changes, including an extended dorsal fin and

1067-432: A low wing loading , combining both large wing area with light weight. Obtaining a large enough wing area without the wings being long, and thus dangerously flexible was more readily accomplished with a biplane. The smaller biplane wing allows greater maneuverability . Following World War I, this helped extend the era of the biplane and, despite the performance disadvantages, most fighter aircraft were biplanes as late as

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1164-507: A minimum of struts; however, it was relatively easy to damage the thin metal skin and required careful handling by ground crews. The 1918 Zeppelin-Lindau D.I fighter was an all-metal stressed-skin monocoque fully cantilevered biplane, but its arrival had come too late to see combat use in the conflict. By the 1930s, biplanes had reached their performance limits, and monoplanes become increasingly predominant, particularly in continental Europe where monoplanes had been increasingly common from

1261-507: A modified undercarriage arrangement, allowing for either wheels, skis, or floats to be interchangeably installed, dependent upon usage and weather conditions. The sole Canadian prototype, CF-AEO , was sold onto Quebec Airways in June 1935. Further Rapides were delivered to other customers in Canada, such as Canadian Airways , who used it on their West Coast and maritime routes. On 30 January 1942,

1358-411: A number of common features, such as its tapered wings, streamlined fairings and Gipsy Six engines. First named the "Dragon Six", the type was marketed as "Dragon Rapide" and later simply known as the "Rapide". Upon its introduction in summer 1934, it proved to be a popular aircraft with airlines and private civil operators alike, attaining considerable foreign sales in addition to its domestic use. Upon

1455-473: A somewhat unusual sesquiplane arrangement, possessing a more substantial lower wing with two spars that eliminated the flutter problems encountered by single-spar sesquiplanes. The stacking of wing planes was suggested by Sir George Cayley in 1843. Hiram Maxim adopted the idea for his steam-powered test rig, which lifted off but was held down by safety rails, in 1894. Otto Lilienthal designed and flew two different biplane hang gliders in 1895, though he

1552-446: A typical Dominie-to-Rapide conversion performed by de Havilland involved the repainting of the exterior (replacing the wartime camouflage scheme) and the installation of sound proofing , upholstered seats and a new décor within the cabin area. Additionally, various third party companies offered and performed their own conversion schemes, including Field Aircraft Services , Airwork Limited, Air Enterprises , W.A. Rollason Limited and

1649-411: Is a two bay biplane , the extra bay being necessary as overlong bays are prone to flexing and can fail. The SPAD S.XIII fighter, while appearing to be a two bay biplane, has only one bay, but has the midpoints of the rigging braced with additional struts; however, these are not structurally contiguous from top to bottom wing. The Sopwith 1½ Strutter has a W shape cabane, however as it does not connect

1746-547: Is better known for his monoplanes. By 1896 a group of young men in the United States, led by Octave Chanute , were flying hang gliders including biplanes and concluded that the externally braced biplane offered better prospects for powered flight than the monoplane. In 1903, the Wright Flyer biplane became the first successful powered aeroplane. Throughout the pioneer years, both biplanes and monoplanes were common, but by

1843-609: Is much more common. The space enclosed by a set of interplane struts is called a bay (much as the architectural form is used), hence a biplane or triplane with one set of such struts connecting the wings on each side of the aircraft is a single-bay biplane . This provided sufficient strength for smaller aircraft such as the First World War -era Fokker D.VII fighter and the Second World War de Havilland Tiger Moth basic trainer. The larger two-seat Curtiss JN-4 Jenny

1940-680: The Avro Anson . K4772 was later used by the Royal Aircraft Establishment (RAE) in automatic landing trials before being broken down for spares. Work on a militarised version of the Rapide was not wasted as multiple sales were soon completed with other military customers, the first of which being to the Spanish government in December 1935. Sensing demand for the type, de Havilland continued to modify

2037-524: The Bristol M.1 , that caused even those with relatively high performance attributes to be overlooked in favour of 'orthodox' biplanes, and there was an allegedly widespread belief held at that time that monoplane aircraft were inherently unsafe during combat. Between the years of 1914 and 1925, a clear majority of new aircraft introduced were biplanes; however, during the latter years of the First World War,

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2134-684: The Grumman Ag Cat are available in upgraded versions with turboprop engines. The two most produced biplane designs were the 1913 British Avro 504 of which 11,303 were built, and the 1928 Soviet Polikarpov Po-2 of which over 20,000 were built, with the Po-2 being the direct replacement for the Soviet copy of the Avro 504. Both were widely used as trainers. The Antonov An-2 was very successful too, with more than 18,000 built. Although most ultralights are monoplanes,

2231-478: The Handley Page Hampden and Handley Page Hereford . Typographical designation of mark numbers (Mk.) varied over time and inconsistencies are common, e.g., Mark II , Mk. II , II , etc. Initially Roman numerals were used, changing to Arabic numerals post- World War II , e.g., Supermarine Spitfire Mk I to Supermarine Spitfire Mk 24 . Note 1: where possible mark numbers are given here in this list in

2328-758: The Lancashire Aircraft Corporation (LAC). By 1958, 81 examples were recorded as still flying on the British register. In the Netherlands, airline KLM , keen to restart operations, set about procuring a handful of Rapides even prior to the end of the war, commencing the first of its re-launched services during September 1945. Various British airlines also became prolific users of the type; British European Airways (BEA), formed on 1 January 1946, took order 39 Rapides during February 1947. BEA used many across its fledgling network, later focusing upon services within

2425-595: The Lite Flyer Biplane, the Sherwood Ranger , and the Murphy Renegade . The feathered dinosaur Microraptor gui glided, and perhaps even flew, on four wings, which may have been configured in a staggered sesquiplane arrangement. This was made possible by the presence of flight feathers on both forelimbs and hindlimbs, with the feathers on the forelimbs opening to a greater span. It has been suggested that

2522-499: The Manufacturer X.XX/XX , e.g., the Avro B.35/46 – this is in addition to the manufacturer's own separate internal designation for the aircraft, e.g., Avro 698. With several manufacturers submitting designs to the same specification this could result in a number of different aircraft with the same X.XX/XX designation, e.g., Handley Page B.35/46 , etc. Upon acceptance of the design(s)

2619-630: The Manufacturer Service-name , e.g., the Avro Anson , however upon acceptance of a new variant the previous (initial) version automatically became the 'Mark I', so in the example given, the previous (first) version of the Anson retrospectively became the Avro Anson Mk I upon acceptance of an Avro Anson Mk II . Sometimes planned variants would be later cancelled leading to 'missing' mark numbers, or

2716-639: The Ministry of Aircraft Production (MAP) in 1940 and then the Ministry of Supply (MoS) in 1946. The system was applied to commercial aircraft as well, two being the de Havilland Comet and Vickers Viscount . During the period, over 800 specifications were issued. Each specification name usually followed a pattern. A leading letter was usually present to identify the aircraft purpose. The codes used included B for "heavy bomber ", e.g., B.12/36, P for "medium bomber", e.g., P.13/36, F for " fighter ", e., F.10/35, and A for "army co-operation", e., A.39/34. The second part

2813-556: The Ministry of Aircraft Production . A number of Dragon Rapides were used to provide internal flights under the control of National Air Communications (NAC). Perhaps one of the most significant early uses of the Rapide during the war occurred during the crucial weeks of May–June 1940, in which the Battle of France occurred; Rapides of No. 24 Squadron acted as aerial couriers between Britain and France; out of 24 aircraft, 10 Rapides were lost during this intense period of fighting. Following

2910-539: The Nieuport-Delage NiD 42 / 52 / 62 series, Fokker C.Vd & e, and Potez 25 , all serving across a large number of air forces. In the general aviation sector, aircraft such as the Waco Custom Cabin series proved to be relatively popular. The Saro Windhover was a sesquiplane with the upper wing smaller than the lower, which was a much rarer configuration than the reverse. The Pfalz D.III also featured

3007-536: The de Havilland Dove . During summer 1933, the de Havilland aircraft company commenced work upon an aircraft to meet an Australian requirement, producing a four-engined faster passenger aircraft capable of seating ten passengers, the DH.86 Dragon Express . An important feature of the DH.86 was the newly developed and powerful Gipsy Six engine, a six-cylinder variant of the four cylinder Gipsy Major engine. The DH.86 would serve as

de Havilland Dragon Rapide - Misplaced Pages Continue

3104-490: The de Havilland Tiger Moth , Bücker Bü 131 Jungmann and Travel Air 2000 . Alternatively, the lower wing can instead be moved ahead of the upper wing, giving negative stagger, and similar benefits. This is usually done in a given design for structural reasons, or to improve visibility. Examples of negative stagger include the Sopwith Dolphin , Breguet 14 and Beechcraft Staggerwing . However, positive (forward) stagger

3201-400: The 1934 King's Cup Race . While having achieved an average speed of 158 MPH, G-ACPM had to be withdrawn from the race during Heat 9 of Round 2 when the wing sustained damage caused by hail while flying over Waddington, Lincolnshire . Another purpose-built Rapide, ZK'-ACO , was entered into the 1934 MacRobertson Air Race ; fitted with three additional fuel tanks within the fuselage to extend

3298-409: The 60th airframe to be produced, G-ADWZ , was modified and used by de Havilland as a trials aircraft. Fitted with elongated rear windows, cabin heating, thickened wing tips, and a strengthened airframe to allow for an elevated gross weight of 5,500 pounds (2,500 kg), G-ADWZ later participated in trials at Martlesham Heath, after which the higher gross weight was cleared for service. In response to

3395-759: The BAC Lightning; the British Aircraft Corporation itself and Hawker Siddeley (HS) then later merged and became British Aerospace , subsequently becoming BAe (now BAE Systems ). Thus the previously mentioned Avro Vulcan was subsequently referred to as the Hawker Siddeley Vulcan; similarly, the Blackburn Buccaneer later became the Hawker Siddeley Buccaneer. Where possible, for clarity the aircraft in this list are listed under

3492-529: The British Air Ministry, which sought to expand this capability. Repeat orders were placed by Airwork in the lead up to the Second World War, upon which point the firm's fleet of Rapides were all taken on by the Royal Air Force (RAF). Edward, Prince of Wales (later Edward VIII ), owned a single Dragon Rapide ( G-ADDD ), which he frequently used for carrying out his royal duties. He flew this aircraft to London on his accession as king in 1936, making him

3589-503: The CR.42 was able to achieve success in the defensive night fighter role against RAF bombers that were striking industrial targets throughout northern Italy. The British Fleet Air Arm operated the Fairey Swordfish torpedo bomber from its aircraft carriers, and used the type in the anti-submarine warfare role until the end of the conflict, largely due to their ability to operate from

3686-518: The Caribou , performed the first non-stop flight between the Canadian mainland and Britain in 30 hours 55 minutes, although the intended target for this long distance flight had originally been Baghdad , Iraq . Despite its relative success, British production of the Dragon was quickly ended when in favour of the more powerful and elegant de Havilland Dragon Rapide , which had been specifically designed to be

3783-503: The First World War, the British Royal Aircraft Factory developed airfoil section wire named RAFwire in an effort to both increase the strength and reduce the drag. Four types of wires are used in the biplane wing structure. Drag wires inside the wings prevent the wings from being folded back against the fuselage, running inside a wing bay from the forward inboard corner to the rear outboard corner. Anti-drag wires prevent

3880-565: The French Nieuport 17 and German Albatros D.III , offered lower drag than a conventional biplane while being stronger than a monoplane. During the Interwar period , numerous biplane airliners were introduced. The British de Havilland Dragon was a particularly successful aircraft, using straightforward design to could carry six passengers on busy routes, such as London-Paris services. During early August 1934, one such aircraft, named Trail of

3977-644: The Germans had been experimenting with a new generation of monoplanes, such as the Fokker D.VIII , that might have ended the biplane's advantages earlier had the conflict not ended when it had. The French were also introducing the Morane-Saulnier AI , a strut-braced parasol monoplane , although the type was quickly relegated to the advanced trainer role following the resolution of structural issues. Sesquiplane types, which were biplanes with abbreviated lower wings such as

de Havilland Dragon Rapide - Misplaced Pages Continue

4074-506: The ORIGINATING company's name or the name of the manufacturer under which it first entered production. Specifications within the tables are listed in numerical order by year of issue; where a given number appears more than once, with one or more letter prefixes, the entries are presented in alphabetical order. In 1917, the Air Board began to issue specifications for new aircraft on behalf of

4171-515: The Rapide had gone into decline and several formerly large operators had phased out the type completely. Due to the declining stocks of spare components available, individual Rapides were commonly being broken up in order to scavenge parts to maintain other active aircraft. Regardless, demand for such an aircraft was still relatively strong at this time, according to Moss. The DH.89 proved an economical and durable aircraft, despite its relatively primitive plywood construction and many were still flying in

4268-504: The Rapide's design following its entry to service, creating both refinements and entirely new derivatives as a result. Aiming to produce a faster version of the Rapide, a smaller, lighter and externally cleaner version, designated as the DH.90 Dragonfly , emerged; first flying in August 1935, the DH.90 failed to achieve a similar rate of sales to the Rapide and production was terminated in 1938 after 67 aircraft had been completed. In November 1935,

4365-454: The Scottish, Scilly , and Channel Islands while gradually selling on displaced and excess aircraft via Airwork. Small independent British airlines that chose to resist pressure from the British government to merge into BEA also commonly operated the Rapide. In order to better distinguish between the different standards of Rapides available in the post-war environment, de Havilland established

4462-497: The a key starting point for the later DH.89. During late 1933, a team at de Havilland, led by aircraft designer Arthur Ernest Hagg , began working on a new design, intended to be a faster and more comfortable successor to the earlier DH.84 Dragon . The new aircraft was, in effect, a twin-engined, scaled-down version of the four-engined DH.86 Express . It shared many common features with the earlier DH.86 Express, including its tapered wings, streamlined fairings and fuselage, as well as

4559-588: The aircraft quickly became popular in the oil industry, with the Iraq Petroleum Company and the Asiatic Petroleum Company also procuring their own Rapides. From August 1934, Railway Air Services (RAS) operated a fleet of Dragon Rapides on routes linking London, the north of England and on to Northern Ireland and Scotland. The RAS DH.89s were named after places on the network, for example "Star of Lancashire". Isle of Man Air Services operated

4656-545: The aircraft's range to 1,000 miles, the aircraft, flown by Squadron Leader J.D. Hewett and Mr C.E. Kay, took sixth place in the handicap race and fifth place in the speed race. In the summer of 1934, the type entered service with UK-based airlines, with Hillman Airways Ltd being first to take delivery in July. The Anglo-Persian Oil Company was another early company to purchase the Rapide; used for quick communications purposes between individual oil fields spread out over vast distances,

4753-548: The announcement of an air race between Britain and Johannesburg , South Africa , de Havilland's design team produced a specialised variant of the Rapid, designated as the DH.92 Dolphin . This one-off derivative featured a retractable undercarriage , an expanded wingspan of 53 feet 7 inches (16.33 m), a modified nose section, and an increased all-up weight of 6,600 pounds (3,000 kg); however, flight tests in August 1936 revealed there to be no performance improvement over

4850-448: The closure of the NAC network, Dragon Rapides continued to fly for British airlines during the war as part of the Associated Airways Joint Committee (AAJC). Upon the outbreak of war, all civil services had been halted; however, some routes were progressively returned to operation as and when they were deemed of value to the war effort or found to be in the national interest. The AAJC co-ordinated

4947-598: The competition aerobatics role and format for such a biplane well-defined by the mid-1930s by the Udet U 12 Flamingo and Waco Taperwing . The Pitts Special dominated aerobatics for many years after World War II and is still in production. The vast majority of biplane designs have been fitted with reciprocating engines . Exceptions include the Antonov An-3 and WSK-Mielec M-15 Belphegor , fitted with turboprop and turbofan engines respectively. Some older biplane designs, such as

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5044-617: The early 2000s. Several Dragon Rapides are operational in the UK, while multiple operators, including Classic Wings and Plane Heritage, offer pleasure flights in them to the general public. Shortly after the end of the Second World War, de Havilland introduced a Dragon Rapide replacement, the de Havilland Dove . Data from Jane's All the World's Aircraft 1938 General characteristics Performance A 1986 Spanish film, Dragon Rapide , covers its historical use by Generalissimo Francisco Franco during

5141-542: The end of World War I . At the start of World War II , several air forces still had biplane combat aircraft in front line service but they were no longer competitive, and most were used in niche roles, such as training or shipboard operation, until shortly after the end of the war. The British Gloster Gladiator biplane, the Italian Fiat CR.42 Falco and Soviet I-153 sesquiplane fighters were all still operational after 1939. According to aviation author Gianni Cattaneo,

5238-591: The end of the conflict, only a total of nine impressed Rapides were restored to their civilian registrations; however, these were joined by many Dominies which had been deemed to be surplus to requirements. Postwar, the Dominie continued to be used for some time by Royal Naval air station flights as communications aircraft. By 1960, the Royal Navy still had a fleet of 14 Dominies, although under normal circumstances only three would be actively used at any one point in time, while

5335-629: The extent of the changes may have justified given the new variant a completely new name, e.g., the Hawker Typhoon II subsequently becoming the Hawker Tempest , or the Avro Lancaster B.IV & B.V entering service as the Avro Lincoln . In a few cases the same aircraft ordered with differing engines would be allocated separate names for each variant, e.g., Hawker Typhoon and Hawker Tornado , or

5432-401: The final service names would usually be chosen by the Air Ministry when they placed a production order, in the above B.35/46 cases, where two aircraft were accepted to this specification, Vulcan and Victor respectively. Upon entering service, in the absence of any already-planned variants a new type would initially have no mark number after the aircraft name, being simply referred to as

5529-725: The first British monarch to fly. In July 1936 a pair of British SIS agents, Cecil Bebb and Major Hugh Pollard , flew Francisco Franco in Rapide G-ACYR from the Canary Islands to Spanish Morocco , at the start of the military rebellion which began the Spanish Civil War . The aircraft involved has since been placed on public display in the Museo del Aire , Madrid , Spain. At the start of Second World War on 3 September 1939, all British civil transport aircraft were requisitioned by

5626-537: The form that was used at the time of acceptance. Variations may be encountered due to changes in format/typographical convention. Note 2: due to mergers and amalgamations within the UK aircraft industry sometimes the name of the manufacturer changed over time, e.g., English Electric later became part of the British Aircraft Corporation (BAC), so the English Electric Lightning then became

5723-407: The go-ahead from management. During May 1934, airworthiness trials commenced at RAF Martlesham Heath using the prototype; during one such flight, upon attaining a speed of roughly 175 miles per hour (282 km/h), the tip of the aircraft's nose buckled. In response to this event, a maximum permissible speed of 160 mph (260 km/h) was implemented for all DH89s. Upon the conclusion of trials,

5820-511: The greater proportion of the work. The Dominies were mainly used by the Royal Air Force (RAF) and Royal Navy for radio and navigation training. Other duties they were used for included passenger and communications missions. Throughout the course of the war, civilian Rapides were progressively replaced by Dominies as the type became available in greater quantities. Rapides were either dispatched to perform passenger operations or occasionally converted for other purposes, such as Air Ambulances ; by

5917-485: The hind limbs could not have opened out sideways but in flight would have hung below and slightly behind the fore limbs. List of Air Ministry specifications#1930.E2.80.931939 This is a partial list of the British Air Ministry (AM) specifications for aircraft . A specification stemmed from an Operational Requirement , abbreviated "OR", describing what the aircraft would be used for. This in turn led to

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6014-515: The less the interference, but the spacing struts must be longer, and the gap must be extremely large to reduce it appreciably. As engine power and speeds rose late in World War I , thick cantilever wings with inherently lower drag and higher wing loading became practical, which in turn made monoplanes more attractive as it helped solve the structural problems associated with monoplanes, but offered little improvement for biplanes. The default design for

6111-452: The letter E (Experimental), e., E.28/39, with training aircraft signified by the letter T (Training), e., T.23/31, and unpowered aircraft , signified by the letter X, e., X.26/40. The letter G (General) signified a general-purpose aircraft, e.g., G.9/45, with an M (Multi-role) being applied to aircraft intended for more than one specific purpose, e.g., M.15/35. The letter C (Cargo) was applied to military transport aircraft, e.g., C.1/42, with

6208-512: The letter O (Observation) used for a naval reconnaissance aircraft, e.g., O.8/38 – the letter S (Spotter) used for the more specialised role of naval spotting, i.e., observing and reporting back the fall of naval gunfire, e.g., S.38/34 – and R (Reconnaissance) for a reconnaissance type – often a flying boat , e.g., R.3/33. Special purpose aircraft would be signified by a letter Q, this being used to specify aircraft such as target-tugs, radio-controlled target drones , etc., e.g., Q.32/55. Sometimes

6305-612: The low speeds and simple construction involved have inspired a small number of biplane ultralights, such as Larry Mauro's Easy Riser (1975–). Mauro also made a version powered with solar cells driving an electric motor called the Solar Riser . Mauro's Easy Riser was used by "Father Goose", Bill Lishman . Other biplane ultralights include the Belgian-designed Aviasud Mistral , the German FK12 Comet (1997–),

6402-412: The main wings can support ailerons , while flaps are more usually positioned on the lower wing. Bracing is nearly always added between the upper and lower wings, in the form of interplane struts positioned symmetrically on either side of the fuselage and bracing wires to keep the structure from flexing, where the wings are not themselves cantilever structures. The primary advantage of the biplane over

6499-545: The majority of UK's wartime scheduled services, which were entirely operated on over-water routes. Other Dragon Rapides were impressed into service with the British armed forces as communications aircraft and training aircraft; Australian Rapides were also impressed by the Royal Australian Air Force (RAAF). Furthermore, while the final production Rapide was completed in November 1941, de Havilland instead produced

6596-407: The majority of major Canadian operators were amalgamated into Canadian Pacific Air Lines , who continued to use the type. Further Canadian sales of the Rapide would occur both during and after the end of the Second World War . During 1938, British operator Airwork Limited placed an initial order for nine Rapides to serve as navigation trainers. The order had been motivated by policy changes within

6693-411: The mid-1930s. Specialist sports aerobatic biplanes are still made in small numbers. Biplanes suffer aerodynamic interference between the two planes when the high pressure air under the top wing and the low pressure air above the lower wing cancel each other out. This means that a biplane does not in practice obtain twice the lift of the similarly-sized monoplane. The farther apart the wings are spaced

6790-409: The military-orientated Dominie variant exclusively. Over 500 additional Dominies were manufactured for military use, powered by improved Gipsy Queen engines; by the end of production in July 1946, a total of 727 aircraft (both Rapides and Dominies combined) had been manufactured. During the war, Dominie production was performed by de Havilland and Brush Coachworks Ltd , the latter being responsible for

6887-561: The most famed copies was the Siemens-Schuckert D.I . The Albatros D.III and D.V , which had also copied the general layout from Nieuport, similarly provided the backbone of the German forces during the First World War. The Albatros sesquiplanes were widely acclaimed by their aircrews for their maneuverability and high rate of climb. During interwar period , the sesquiplane configuration continued to be popular, with numerous types such as

6984-545: The naval Spotting role also being used for other purposes, e.g., S.15/33, resulting in the Blackburn Shark and Fairey Swordfish , the latter aircraft being primarily utilised as a torpedo bomber . Similarly S.24/37, which produced the Fairey Barracuda , again primarily designed for spotting, the dive bomber /torpedo bomber requirements being regarded as secondary when the specification was issued, but for which roles it

7081-529: The night ground attack role throughout the Second World War. In the case of the Po-2, production of the aircraft continued even after the end of the conflict, not ending until around 1952. A significant number of Po-2s were fielded by the Korean People's Air Force during the Korean War , inflicting serious damage during night raids on United Nations bases. The Po-2 is also the only biplane to be credited with

7178-422: The others were stored at RAF Lossiemouth , Moray , Scotland . The last of the Royal Navy's Dominies had been phased out of service during 1963; thirteen aircraft were subsequently sold on via public tender , a number of which having been converted to civil Rapide configurations. Many ex-RAF survivors had quickly entered commercial service after the end of the conflict; according to aviation author Peter W. Moss,

7275-483: The outbreak of the First World War biplanes had gained favour after several monoplane structural failures resulted in the RFC's "Monoplane Ban" when all monoplanes in military service were grounded, while the French also withdrew most monoplanes from combat roles and relegated them to training. Figures such as aviation author Bruce observed that there was an apparent prejudice held even against newly-designed monoplanes, such as

7372-454: The outbreak of the World War II , many of the civil Rapides were impressed into service with the Royal Air Force (RAF) and Royal Navy . Referred to in military service by the name de Havilland Dominie , the type was employed for radio and navigation training, passenger transport and communications missions. British training aircraft had names with educational associations, and dominie is

7469-406: The outer wing. On a biplane, since the angles are closer to the ideal of being in direct line with the forces being opposed, the overall structure can then be made stiffer. Because of the reduced stiffness, wire braced monoplanes often had multiple sets of flying and landing wires where a biplane could easily be built with one bay, with one set of landing and flying wires. The extra drag from the wires

7566-518: The preparation for the Spanish Civil War . Related development Related lists Biplane Biplanes offer several advantages over conventional cantilever monoplane designs: they permit lighter wing structures, low wing loading and smaller span for a given wing area. However, interference between the airflow over each wing increases drag substantially, and biplanes generally need extensive bracing, which causes additional drag. Biplanes are distinguished from tandem wing arrangements, where

7663-409: The prototype was sold. By November 1934, series production of the Rapide had reached full swing. Originally referred to as the "Dragon Six", the aircraft was first marketed as the "Dragon Rapide", although the type later came to be popularly referred to as simply the "Rapide". Prior to the outbreak of the Second World War , 205 aircraft were manufactured for airlines and other private owners all around

7760-557: The purpose for which an aircraft is used in service would change from that for which the specification to which it was designed was issued, and so there are some discrepancies and inconsistencies in designation, the Royal Navy in particular liking to specify multiple roles for its aircraft in an attempt to make the best use of the necessarily limited hangar space onboard its aircraft carriers . In this case this resulted in several types designed to specifications originally intended to signify

7857-634: The relatively compact decks of escort carriers . Its low stall speed and inherently tough design made it ideal for operations even in the often severe mid-Atlantic weather conditions. By the end of the conflict, the Swordfish held the distinction of having caused the destruction of a greater tonnage of Axis shipping than any other Allied aircraft. Both the German Heinkel He 50 and the Soviet Polikarpov Po-2 were used with relative success in

7954-503: The same Gipsy Six engines. However, the DH.89 demonstrated none of the operational vices of the Express. On 17 April 1934, the prototype conducted its maiden flight at Hatfield Aerodrome , Hertfordshire . Flown by senior de Havilland test pilot H.S. Broad, it was powered by a pair of 200 horsepower (150 kW) Gypsy Six engines. Even prior to the prototype's first flight, plans to proceed with serial production of DH.89 had already received

8051-499: The same overall strength and is therefore lighter. A given area of wing also tends to be shorter, reducing bending moments on the spars, which then allow them to be more lightly built as well. The biplane does however need extra struts to maintain the gap between the wings, which add both weight and drag. The low power supplied by the engines available in the first years of aviation limited aeroplanes to fairly low speeds. This required an even lower stalling speed, which in turn required

8148-502: The same portion of the atmosphere and thus interfere with each other's behaviour. In a biplane configuration with no stagger from the upper wing to the lower wing, the lift coefficient is reduced by 10 to 15 percent compared to that of a monoplane using the same airfoil and aspect ratio . The lower wing is usually attached to the fuselage , while the upper wing is raised above the fuselage with an arrangement of cabane struts , although other arrangements have been used. Either or both of

8245-700: The series of Nieuport military aircraft—from the Nieuport 10 through to the Nieuport 27 which formed the backbone of the Allied air forces between 1915 and 1917. The performance of the Nieuport sesquiplanes was so impressive that the Idflieg (the German Inspectorate of flying troops) requested their aircraft manufacturers to produce copies, an effort which was aided by several captured aircraft and detailed drawings; one of

8342-423: The specification itself, e.g. a two-engined fighter with four machine guns. So for example, OR.40 for a heavy bomber led to Specification B.12/36. Aircraft manufacturers would be invited to present design proposals to the ministry, following which prototypes of one or more of the proposals might be ordered for evaluation. On very rare occasions, a manufacturer would design and build an aircraft using their own money as

8439-475: The standard Rapide, leading to the sole Dolphin being scrapped months later. In November 1936, in response to suggestions that the addition of flaps would aid in landing, a single Rapide was modified in order to explore their functionality. Based on this performance, in February 1937, de Havilland announced that flaps would be fitted to all production aircraft from that year onwards, while other improvements such as

8536-400: The upper and lower wings together. The sesquiplane is a type of biplane where one wing (usually the lower) is significantly smaller than the other. The word, from Latin, means "one-and-a-half wings". The arrangement can reduce drag and weight while retaining the biplane's structural advantages. The lower wing may have a significantly shorter span, or a reduced chord . Examples include

8633-419: The wings are placed forward and aft, instead of above and below. The term is also occasionally used in biology , to describe the wings of some flying animals . In a biplane aircraft, two wings are placed one above the other. Each provides part of the lift, although they are not able to produce twice as much lift as a single wing of similar size and shape because the upper and the lower are working on nearly

8730-434: The wings from folding up, and run from the underside of the outer wing to the lower wing root. Conversely, landing wires prevent the wings from sagging, and resist the forces when an aircraft is landing, and run from the upper wing centre section to outboard on the lower wings. Additional drag and anti-drag wires may be used to brace the cabane struts which connect the fuselage to the wings, and interplane struts, which connect

8827-421: The wings from moving forward when the aircraft stops and run the opposite direction to the drag wires. Both of these are usually hidden within the wings, and if the structure is sufficiently stiff otherwise, may be omitted in some designs. Indeed many early aircraft relied on the fabric covering of the wing to provide this rigidity, until higher speeds and forces made this inadequate. Externally, lift wires prevent

8924-597: The wings to each other, it does not add to the number of bays. Large transport and bombing biplanes often needed still more bays to provide sufficient strength. These are often referred to as multi-bay biplanes . A small number of biplanes, such as the Zeppelin-Lindau D.I have no interplane struts and are referred to as being strutless . Because most biplanes do not have cantilever structures, they require rigging wires to maintain their rigidity. Early aircraft used simple wire (either braided or plain), however during

9021-519: The world. The Rapide is perhaps the most successful British-built short-haul commercial passenger aircraft to be produced during the 1930s. In response to the issuing of Specification G.18/35 by the British Air Ministry , de Havilland decided to design and produce a single prototype of a modified Rapide for undertaking coastal reconnaissance. Trials using the prototype, K4772 , were performed between April and June 1935 at RAF Martlesham Heath and RAF Gosport . However, it ultimately lost out to its rival,

9118-420: Was a number identifying it in sequence and then after the slash, the year it was formulated, so in the example given above, B.12/36 signifies a specification for a heavy bomber , the twelfth specification of all types issued in 1936 . Specifications were not always issued in sequence. Admiralty specifications were identified by the letter N (Naval), e., N.21/45, and experimental specifications identified by

9215-505: Was almost exclusively subsequently used, the original spotting requirement having been made obsolete with the introduction of radar . In addition, some (mostly early) specifications appear to have no letter prefix at all, e.g., 1/21, the Vickers Virginia III . The names of the aircraft shown in the table are not necessarily those they carried when provided for evaluation as at this point an aircraft would usually be referred to as

9312-423: Was not enough to offset the aerodynamic disadvantages from having two airfoils interfering with each other however. Strut braced monoplanes were tried but none of them were successful, not least due to the drag from the number of struts used. The structural forces acting on the spars of a biplane wing tend to be lower as they are divided between four spars rather than two, so the wing can use less material to obtain

9409-741: Was widely used by the United States Army Air Force (USAAF) while the US Navy operated the Naval Aircraft Factory N3N . In later civilian use in the US, the Stearman became particularly associated with stunt flying such as wing-walking , and with crop dusting, where its compactness worked well at low levels, where it had to dodge obstacles. Modern biplane designs still exist in specialist roles such as aerobatics and agricultural aircraft with

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