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87-528: The Supermarine Southampton was a flying boat of the interwar period designed and produced by the British aircraft manufacturer Supermarine . It was one of the most successful flying boats of the era. The Southampton was derived from the experimental Supermarine Swan , and thus was developed at a relatively high pace. The design of the Southampton represented a new standard for maritime aircraft, and

174-562: A United States naval aviator in an M.5. The Aeromarine Plane and Motor Company modified the Felixstowe F.5 into Aeromarine 75 airliner flying boats which with Aeromarine West Indies Airways flew Air Mail to Florida, Bahamas, and Cuba along with being passenger carriers. The German aircraft manufacturing company Hansa-Brandenburg built flying boats starting with the model Hansa-Brandenburg GW in 1916. The Austro-Hungarian firm, Lohner-Werke began building flying boats, starting with

261-521: A batch of six production Southamptons from Supermarine. Unusually, a prototype was never built and tested, an indication of the Air Ministry's confidence in Mitchell's design. The development time was relatively compact. Simplicity was a key philosophy practised by Mitchell and his design team, an example with e Southampton being the avoidance of the traditional use of cross-bracing wires between

348-621: A crashed Short Calcutta on the airmail run between Genoa and Alexandria. Different powerplants were fitted in variants: The restored wooden fuselage of Supermarine Southampton 1 N9899 is on display at the Royal Air Force Museum in Hendon. Data from Supermarine Aircraft since 1914 General characteristics Performance Armament Related development Aircraft of comparable role, configuration, and era Related lists Flying boat Though

435-469: A five-seat Sanchez-Besa from 1 August 1912. The French Navy ordered its first floatplane in 1912. None of these crafts to date were flying boats. In 1911–12, François Denhaut constructed the first flying boat , with a fuselage forming a hull, using various designs to give hydrodynamic lift at take-off. Its first successful flight was on 13 April 1912. Throughout 1910 and 1911 American pioneering aviator Glenn Curtiss developed his floatplane into

522-470: A flying boat’s fuselage provides buoyancy, it may also utilize under-wing floats or wing-like hull projections (called sponsons ) for additional stability. Ascending into common use during the First World War , flying boats rapidly grew in both scale and capability during the interwar period , during which time numerous operators found commercial success with the type. Flying boats were some of

609-698: A fully enclosed cabin. Trials of the America began on 23 June 1914 with Porte also as Chief Test Pilot; testing soon revealed serious shortcomings in the design; it was under-powered, so the engines were replaced with more powerful engines mounted in a tractor configuration. There was also a tendency for the nose of the aircraft to try to submerge as engine power increased while taxiing on water. This phenomenon had not been encountered before, since Curtiss' earlier designs had not used such powerful engines nor large fuel/cargo loads and so were relatively more buoyant. In order to counteract this effect, Curtiss fitted fins to

696-581: A further sum" from the Women's Aerial League of Great Britain. American businessman Rodman Wanamaker became determined that the prize should go to an American aircraft and commissioned the Curtiss Aeroplane and Motor Company to design and build an aircraft capable of making the flight. Curtiss' development of the Flying Fish flying boat in 1913 brought him into contact with John Cyril Porte ,

783-585: A glide." At Felixstowe, Porte made advances in flying boat design and developed a practical hull design with the distinctive "Felixstowe notch". Porte's first design to be implemented in Felixstowe was the Felixstowe Porte Baby , a large, three-engined biplane flying-boat, powered by one central pusher and two outboard tractor Rolls-Royce Eagle engines. Porte modified an H-4 with a new hull whose improved hydrodynamic qualities made taxiing, take-off and landing much more practical, and called it

870-493: A heavily modified Short Empire flying boat. The larger Maia took off, carrying the smaller Mercury loaded to a weight greater than it could take off with. This allowed the Mercury to carry sufficient fuel for a direct trans-Atlantic flight with the mail. Unfortunately this was of limited usefulness, and the Mercury had to be returned from America by ship. The Mercury did set a number of distance records before in-flight refuelling

957-404: A joint bid. A company under combined ownership was then formed, Qantas Empire Airways. The new ten-day service between Rose Bay, New South Wales (near Sydney ), and Southampton was such a success with letter-writers that before long the volume of mail was exceeding aircraft storage space. A better solution to the problem was sought by the British government during the early 1930s, who released

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1044-667: A new engine, the Rolls-Royce R , which had been designed for racing. During the 1930s a new generation of much larger and more powerful engines appeared and the Lion became uncompetitive. By the time the Bristol Hercules and the Rolls-Royce Merlin arrived in the late 1930s, the Lion was obsolete. The Sea Lion, a marine version of the Lion, was used to power high speed RAF Rescue Launches . The Lion aero engine

1131-478: A number of other countries. Eight new aircraft were sold to Argentina , with Turkey purchasing six aircraft and Australia buying two ex-RAF Mk 1 aircraft. Japan also purchased a single aircraft which was later converted into an 18-passenger cabin airliner. The United States Navy also requested a quote, but no order materialised. One RAF aircraft was loaned to Imperial Airways , with British Civil Registration G-AASH , for three months from December 1929 to replace

1218-458: A publicity stunt. It flew to America in 1930–31, crossing the Atlantic via an indirect route over 9 months. It was the largest flying boat of its time, but was severely underpowered and was limited by a very low operational ceiling. Only three were built, with a variety of different engines installed, in an attempt to overcome the lack of power. Two of these were sold to Italy. The Dornier Wal

1305-512: A record of over 250 mph (400 km/h) in 1932 and John Cobb 's 394 mph (634 km/h) Railton Mobil Special in 1947—a record that came well after the Lion had passed its prime and stood until the 1960s. The record had been held by British drivers for 32 years. Lions powered successful entrants in the most prestigious event in air racing, the Schneider Trophy , in 1922 and 1927 but were dropped by Supermarine in favour of

1392-598: A result of this action, British flying boats were dazzle-painted to aid identification in combat. The Curtiss Aeroplane and Motor Company independently developed its designs into the small Model "F", the larger Model "K" (several of which were sold to the Russian Naval Air Service), and the Model "C" for the U.S. Navy. Curtiss among others also built the Felixstowe F.5 as the Curtiss F5L, based on

1479-449: A retired Royal Navy lieutenant, aircraft designer and test pilot who was to become an influential British aviation pioneer. Recognising that many of the early accidents were attributable to a poor understanding of handling while in contact with the water, the pair's efforts went into developing practical hull designs to make the transatlantic crossing possible. At the same time the British boat building firm J. Samuel White of Cowes on

1566-417: A series of exercises, the ability of the Southampton to independently operate, even within inhospitable weather conditions, was well proven. Andrews and Morgan observed that the Southampton quickly proved itself to have primacy amongst European flying boats of the era, a fact that was promptly demonstrated by its overseas activities. Amongst the tasks of which RAF Southamptons performed was a series of "showing

1653-667: A single Sunderland operating off Norway was attacked by six German Junkers Ju 88C fighters; during the engagement, it shot one down and damaged another until it retreated and drove off the rest. The Germans reputedly nicknamed the Sunderland the Fliegendes Stachelschwein ("Flying Porcupine") due to its defensive firepower. Sunderlands in the Mediterranean theatre proved themselves on multiple high-profile occasions, flying many evacuation missions during

1740-482: A single engine, leading to the aircraft's formal delivery to the RAF occurring during mid-1925. Following the completion of the initial six aircraft, further orders for the Southampton were promptly received. Supermarine lacked the factory capacity to keep up with demand, thus an additional facility were acquired on the other side of Southampton Water, after which production of the type was centred in this location. Throughout

1827-493: A specification calling for a new large aircraft capable of carrying up to 24 passengers in spacious comfort along with adequate room for airmail or freight while simultaneously being capable of a cruising speed of 170 mph and a range of at least 700 miles; the capacity for an extended range of 2,000 miles to serve the North Atlantic route was also stipulated. Originally intended for use by IAL, partner Qantas agreed to

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1914-562: A weak hull and poor water handling. The combination of the new Porte-designed hull, this time fitted with two steps, with the wings of the H-12 and a new tail, and powered by two Rolls-Royce Eagle engines, was named the Felixstowe F.2 and first flew in July 1916, proving greatly superior to the Curtiss on which it was based. It was used as the basis for all future designs. It entered production as

2001-538: The Felixstowe F.1 . Porte's innovation of the "Felixstowe notch" enabled the craft to overcome suction from the water more quickly and break free for flight much more easily. This made operating the craft far safer and more reliable, although similar devices had been in use in France since 1911. The "notch" breakthrough would soon after evolve into a "step", with the rear section of the lower hull sharply recessed above

2088-683: The German seizure of Crete , each carrying as many as 82 passengers. One Sunderland flew the reconnaissance mission to observe the Italian fleet at anchor in Taranto before the famous Royal Navy Fleet Air Arm 's torpedo attack on 11 November 1940 . The largest flying boat of the war was the Blohm & Voss BV 238 , which was also the heaviest plane to fly during the Second World War and

2175-603: The Gnome Omega –powered Hydravion , a trimaran floatplane. Fabre's first successful take off and landing by a powered floatplane inspired other aviators and he designed floats for several other flyers. The first hydro-aeroplane competition was held in Monaco in March 1912, featuring aircraft using floats from Fabre, Curtiss, Tellier and Farman. This led to the first scheduled seaplane passenger services at Aix-les-Bains , using

2262-585: The Imperial Japanese Navy , Argentine Naval Aviation , and the Royal Danish Navy . The aircraft were adopted by civilian operators, such as Imperial Airways and Japan Air Transport . Amongst other feats, the Southampton facilitated an early 10-passenger cross-channel airline service between England and France. The Southampton's origins can be traced to an earlier experimental aircraft designed by R.J. Mitchell at Supermarine ,

2349-763: The Isle of Wight set up a new aircraft division and produced a flying boat in the United Kingdom. This was displayed at the London Air Show at Olympia in 1913. In that same year, a collaboration between the S. E. Saunders boatyard of East Cowes and the Sopwith Aviation Company produced the "Bat Boat", an aircraft with a consuta laminated hull that could operate from land or on water, which today we call an amphibious aircraft . The "Bat Boat" completed several landings on sea and on land and

2436-648: The Lohner E in 1914 and the later (1915) Lohner L which was copied widely. In September 1919, British company Supermarine started operating the first flying boat service in the world, from Woolston to Le Havre in France , but it was short-lived. A Curtiss NC-4 became the first aircraft to fly across the Atlantic Ocean in 1919, crossing via the Azores . Of the four that made the attempt, only one completed

2523-668: The PBY Catalina and Short Sunderland played key roles in both the Pacific Theater and the Atlantic of the Second World War. The popularity of flying boats gradually tailed off during the Cold War era, partially because of the difficulty in maintaining operations in inclement weather when sea conditions may easily prevent takeoffs and landings while land based aircraft are unaffected, and investments in airports during

2610-640: The Swan , which made its maiden flight on 25 March 1924. During this time, the Royal Air Force (RAF) was close to giving up on the procurement of effective large flying boats , having been disappointed by types such as the Felixstowe F.5 . Having been impressed by the Swan's performance during trials at RAF Felixstowe , the British Air Ministry generated Specification R.18/24 and ordered

2697-521: The 1930s, flying boats made it possible to have regular air transport between the U.S. and Europe, opening up new air travel routes to South America, Africa, and Asia. Foynes , Ireland and Botwood , Newfoundland and Labrador were the termini for many early transatlantic flights. In areas where there were no airfields for land-based aircraft, flying boats could stop at small island, river, lake or coastal stations to refuel and resupply. The Pan Am Boeing 314 Clipper planes brought exotic destinations like

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2784-675: The 1930s. A number of advanced features made it the most powerful engine of its day and kept it in production long after other contemporary designs had been superseded. It is particularly well known for its use in a number of racing designs, for aircraft, boats and cars. Early in the First World War, Napier were contracted to build aero engines to designs from other companies, initially a Royal Aircraft Factory model and then Sunbeams . Both engines proved to be unreliable and in 1916 Napier decided to design an engine with high power, light weight and low frontal area. Napier's engineers laid out

2871-600: The Curtiss Model E, and soon tested landings on and take-offs from ships using the Curtiss Model D. In Britain, Captain Edward Wakefield and Oscar Gnosspelius began to explore the feasibility of flight from water in 1908. They decided to make use of Windermere in the Lake District , England's largest lake to test their floatplane. The latter's first attempts to fly attracted large crowds, though

2958-518: The Far East within reach of air travelers and came to represent the romance of flight. By 1931, mail from Australia was reaching Britain in just 16 days – less than half the time taken by sea. In that year, government tenders on both sides of the world invited applications to run new passenger and mail services between the ends of the British Empire , and Qantas and IAL were successful with

3045-473: The Felixstowe F.2A, being used as a patrol aircraft, with about 100 being completed by the end of World War I. Another seventy were built, and these were followed by two F.2c, which were built at Felixstowe. The Felixstowe F.5 was intended to combine the good qualities of the F.2 and F.3, with the prototype first flying in May 1918. The prototype showed superior qualities to its predecessors but, to ease production,

3132-555: The L series, and progressing with the M series. The Macchi M.5 in particular was extremely manoeuvrable and agile and matched the land-based aircraft it had to fight. 244 were built in total. Towards the end of the First World War, the aircraft were flown by the Italian Navy Aviation, the United States Navy and United States Marine Corps airmen. Ensign Charles Hammann won the first Medal of Honor awarded to

3219-488: The Lion the most powerful Allied aircraft engine, which had previously been the Liberty L-12 , producing 400 horsepower (300 kW). As the most powerful engine available (particularly after a turbocharger became an option in 1922), the Lion went on to commercial success. Through the years between the wars the Lion was ubiquitous and Napier manufactured little else. They stopped making cars in 1925 and little thought

3306-691: The Navy, as a member of the Royal Naval Air Service . Appointed Squadron Commander of Royal Navy Air Station Hendon , he soon convinced the Admiralty of the potential of flying boats and was put in charge of the naval air station at Felixstowe in 1915. Porte persuaded the Admiralty to commandeer (and later, purchase) the America and a sister craft from Curtiss. This was followed by an order for 12 more similar aircraft, one Model H-2 and

3393-569: The River Seine with a towed kite glider on floats. The first of his unpowered flights was 150 yards. He later built a powered floatplane in partnership with Louis Blériot , but the machine was unsuccessful. Other pioneers also attempted to attach floats to aircraft in Britain, Australia, France and the USA. On 28 March 1910, Frenchman Henri Fabre flew the first successful powered floatplane,

3480-465: The aircraft crashed into the lake. Wakefield's pilot however, taking advantage of a light northerly wind, successfully took off and flew at a height of 50 feet to Ferry Nab, where he made a wide turn and returned for a perfect landing on the lake's surface. In 1913, the Daily Mail newspaper put up a £10,000 prize for the first non-stop aerial crossing of the Atlantic which was soon "enhanced by

3567-400: The aircraft failed to take off and required a re-design of the floats incorporating features of Borwick's successful speed-boat hulls. Meanwhile, Wakefield ordered a floatplane similar to the design of the 1910 Fabre Hydravion. By November 1911, both Gnosspelius and Wakefield had aircraft capable of flight from water and awaited suitable weather conditions. Gnosspelius's flight was short-lived as

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3654-555: The best flying boat of the conflict, the Kawanishi H8K . Its design was based upon its immediate predecessor, the Kawanishi H6K , but was a considerably larger and longer-ranged aircraft designed at the request of the Navy just prior to the outbreak of war. On the night of 4 March 1942, two H8Ks conducted the second raid on Pearl Harbor , refuelling en route by submarine at French Frigate Shoals in order to achieve

3741-604: The change being made official on 1 April 1940. BOAC continued to operate flying boat services from the (slightly) safer confines of Poole Harbour during wartime, returning to Southampton in 1947. When Italy entered the war in June 1940, the Mediterranean was closed to allied planes, and BOAC and Qantas operated the Horseshoe Route between Durban and Sydney using Short Empire flying boats. The Martin Company produced

3828-900: The conflict that eased the introduction of larger, and more efficient, land-based airliners. Despite being largely overshadowed, limited use of the type continued with some operators, such as in the case of the Shin Meiwa US-1A and the Martin JRM Mars . In the 21st century, flying boats maintain a few niche uses, such as dropping water on forest fires , air transport around archipelagos, and access to undeveloped areas. Many modern seaplane variants, whether float or flying boat types, are convertible amphibious aircraft where either landing gear or flotation modes may be used to land and take off. The quest for an aircraft that could take off or land from water began with float planes, which are not flying boats. The Frenchman Alphonse Pénaud filed

3915-544: The design of the engine, renamed Lion, was completed in 1917; hand-built prototypes ran later that year. It was fitted to an Airco DH.9 in early 1918, and many cooling problems were observed during testing. The milled block was difficult to build with the required accuracy and the design reverted to separate aluminium cylinders. Both problems were solved by the middle of the year and the engine entered production in June 1918. The first Lion I versions delivered 450 horsepower (340 kW) from their 24 litres . The power output made

4002-672: The end of the conflict, the Navy opted to scaled back their order, buying only the five aircraft. The five Mars were completed, and the last delivered in 1947. The U.S. used several 4-engine flying boats during World War II, including those that had been operating as civilian airliners. This included five Boeing B-314 Clippers , four more as the C-98s; two Martin M-130 Clippers ,a Martin XPB2M-1/XPB2M-1R prototype, and one JRM-1 Mars ; three Sikorsky VS-44s (JR2S-1). However,

4089-483: The engine with its 12 cylinders in what they called a "broad arrow" —three banks of four cylinders sharing a common crankcase. The configuration is also known as a W engine . The engine was also advanced in form, the heads using four valves per cylinder with twin overhead camshafts on each bank of cylinders and a single block being milled from aluminium instead of the common separate-cylinder steel construction used on almost all other designs. Under Arthur Rowledge ,

4176-742: The final Porte hull designs and powered by American Liberty engines . Meanwhile, the pioneering flying boat designs of François Denhaut had been steadily developed by the Franco-British Aviation Company into a range of practical craft. Smaller than the Felixstowes, several thousand FBAs served with almost all of the Allied forces as reconnaissance craft, patrolling the North Sea, Atlantic and Mediterranean oceans. In Italy, several flying boats were developed, starting with

4263-449: The first patent for a flying machine with a boat hull and retractable landing gear in 1876 but failed to build one. Austrian Wilhelm Kress is credited by some with attempting to build the first successful seaplane Drachenflieger , a floatplane , in 1898, although its two 30 hp Daimler engines were inadequate for take-off and it later sank when one of its two floats collapsed. On 6 June 1905, Gabriel Voisin took off and landed on

4350-536: The flag" long-distance formation flights. Perhaps the most notable of these flights was a 43,500 km (27,000 mi) expedition conducted during 1927 and 1928; it was carried out by four Southamptons of the Far East Flight , setting out from Felixstowe via the Mediterranean and India to Singapore . These aircraft featured various technical changes, including enlarged fuel tanks composed of tinned steel, increased oil tankage, greater radiator surface area, and

4437-579: The flight plan; the aircraft was a conventional biplane design with two-bay, unstaggered wings of unequal span with two pusher inline engines mounted side-by-side above the fuselage in the interplane gap. Wingtip pontoons were attached directly below the lower wings near their tips. The design (later developed into the Model H ), resembled Curtiss' earlier flying boats, but was built considerably larger so it could carry enough fuel to cover 1,100 mi (1,800 km). The three crew members were accommodated in

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4524-513: The flight. Before the development of highly reliable aircraft, the ability to land on water was a desirable safety feature for transoceanic travel. In 1923, the first successful commercial flying boat service was introduced with flights to and from the Channel Islands . The British aviation industry was experiencing rapid growth. The Government decided that nationalization was necessary and ordered five aviation companies to merge to form

4611-468: The forward lower hull section, and that characteristic became a feature of both flying boat hulls and floatplane floats. The resulting aircraft would be large enough to carry sufficient fuel to fly long distances and could berth alongside ships to take on more fuel. Porte then designed a similar hull for the larger Curtiss H-12 flying boat which, while larger and more capable than the H-4s, shared failings of

4698-504: The initiative and undertook to purchase six of the new Short S23 "C" class or "Empire" flying boats as well. Being ordered from aviation manufacturer Short Brothers , the Empire was reportedly hailed as being "one of the world's boldest experiments in aviation", while early sceptics referred to the order less favourably as being a 'gamble'. IAL were so impressed by the Empire that it placed a follow-on order for another 11; when combined with

4785-541: The largest aircraft built and flown by any of the Axis Powers . Only the first prototype ever flew, commencing flight trials in April 1944. Months later, it was strafed and partially sunk while moored on Lake Schaal , to the east of Hamburg ; it never returned to flight, instead being intentionally sunk in deep water after the end of the conflict. The Imperial Japanese Navy operated what has been often described as

4872-493: The largest aircraft of the first half of the 20th century, exceeded in size only by bombers developed during the Second World War . Their advantage lay in using water instead of expensive land-based runways, making them the basis for international airlines in the interwar period. They were also commonly used as maritime patrol aircraft and air-sea rescue , particularly during times of conflict. Flying boats such as

4959-473: The lighter hull, while the remaining 400 lb (180 kg) represented the weight of water that could be soaked up by the wooden hull) allowing for an increase in range of approximately 200 mi (320 km).{ All metallic elements were anodised to deter corrosion . During 1929, 24 of the Southampton Mk Is were converted by having newly built metal hulls replacing the wooden ones. Later on,

5046-448: The main 4-engined flying boat of the U.S. forces was the PB2Y Coronado , of which nearly 220 were used in several versions:maritime patrol, bombing, medical/hospital transport, and for regular cargo; it also served with British forces in the Battle for the Atlantic . Napier Lion The Napier Lion is a 12-cylinder, petrol -fueled 'broad arrow' W12 configuration aircraft engine built by D. Napier & Son from 1917 until

5133-444: The most notable of these flights was a 43,500 km (27,000 mi) expedition conducted during 1927 and 1928; it was carried out by four Southamptons of the Far East Flight , setting out from Felixstowe via the Mediterranean and India to Singapore . Both the RAF and Supermarine acquired considerable acclaim from these flights, as well as proving that flying boats had evolved to become reliable means of long-distance transport. In

5220-448: The necessary range; poor visibility caused this attack on Pearl Harbor to fail to accomplish any significant damage. An improved H8K2 variant of the type, featuring extremely heavy defensive armament, was also introduced. In November 1939, IAL was restructured into three separate companies: British European Airways , British Overseas Airways Corporation (BOAC), and British South American Airways (which merged with BOAC in 1949), with

5307-430: The original order for 28 flying boats, this was the largest single order to have ever been placed for a British civil aircraft at that time. Delivering the mail as quickly as possible generated a lot of competition and some innovative designs. One variant of the Short Empire flying boats was the strange-looking " Maia and Mercury ". It was a four-engined floatplane "Mercury" (the winged messenger) fixed on top of "Maia",

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5394-424: The over-water sectors of the Deutsche Luft Hansa South Atlantic Airmail service. The military value of flying boats was well recognized, and every country bordering on water operated them in a military capacity at the outbreak of the Second World War . Flying boats such as the PBM Mariner patrol bomber, PBY Catalina , Short Sunderland , and Grumman Goose were procured in large numbers. The Sunderland, which

5481-516: The production version was modified to make extensive use of components from the F.3, which resulted in lower performance than the F.2A or F.3. The Felixstowe flying boats were extensively employed by the Royal Navy for coastal patrols, including searching for German U-boats . In 1918 they were towed on lighters towards the northern German ports to extend their range; on 4 June 1918 this resulted in three F.2As engaging with ten German seaplanes, shooting down two confirmed and four probables at no loss. As

5568-420: The prototype XPB2M Mars based on their PBM Mariner patrol bomber, with flight tests between 1941 and 1943. The Mars was converted by the Navy into a transport aircraft designated the XPB2M-1R. Satisfied with the performance, 20 of the modified JRM-1 Mars were ordered. The first of the five production Mars flying boats entered service ferrying cargo to Hawaii and the Pacific Islands on 23 January 1944. Following

5655-493: The rear fuselage. These rear gunners had a relatively favourable field of fire. The Southampton's structure was revised substantially over successive batches. The Southampton Mk I had both its hull and its wings manufactured from wood, while the Southampton Mk II had a hull with a single thickness of metal (duralumin) (the Mk I had a double wooden bottom); this change gave an effective weight saving of 900 lb (410 kg) (of this 900 lb, 500 lb (230 kg) represented

5742-453: The remaining as Model H-4 's. Four examples of the latter were assembled in the UK by Saunders . All of these were similar to the design of the America and, indeed, were all referred to as America s in Royal Navy service. The engines, however, were changed from the under-powered 160 hp Curtiss engines to 250 hp Rolls-Royce Falcon engines. The initial batch was followed by an order for 50 more (totalling 64 Americas overall during

5829-420: The removal of all armaments. According to Andrews and Morgan, the Southampton acquired considerable fame amongst the general public from these flights; Supermarine also shared in this reputation gain. There were also practical benefits of these flights, as new anti-corrosion techniques were developed as a result of feedback. While the RAF was the type's most high-profile customer, further Southamptons were sold to

5916-406: The sides of the bow to add hydrodynamic lift, but soon replaced these with sponsons , a type of underwater pontoon mounted in pairs on either side of a hull. These sponsons (or their engineering equivalents) and the flared, notched hull would remain a prominent feature of flying boat hull design in the decades to follow. With the problem resolved, preparations for the crossing resumed. While the craft

6003-453: The state-owned Imperial Airways of London (IAL). IAL became the international flag-carrying British airline, providing flying boat passenger and mail transport links between Britain and South Africa using aircraft such as the Short S.8 Calcutta . During the 1920s, the Royal Air Force (RAF) Far East flight performed a series of "showing the flag" long-distance formation flights using the newly developed Supermarine Southampton . Perhaps

6090-416: The successful Curtiss Model D land-plane, which used a larger central float and sponsons. Combining floats with wheels, he made the first amphibian flights in February 1911 and was awarded the first Collier Trophy for US flight achievement. From 1912 his experiments resulted in the 1913 Model E and Model F , which he called "flying-boats". In February 1911, the United States Navy took delivery of

6177-438: The type was also furnished with metal propellers produced by Leitner-Watts . Some of the later aircraft were built with metal wings and were probably designated as Southampton Mk III , although this designation's usage has been disputed. During August 1925, the first Southamptons entered service with the RAF, the type being initially assigned to No. 480 (Coastal Reconnaissance) Flight, based at RAF Calshot . As validated through

6264-430: The type's production run, the Southampton's design continued to be refined; changes included improved engines models and the substitution of the wooden hull and its wings with metal ( duralumin ) counterparts. By the end of production, a total of 83 Southamptons were constructed, excluding the three-engined Southampton MK X , which was a single prototype. Several models and derivates of the Southampton were developed; it

6351-532: The vast distances of the Pacific Theater and the Atlantic , locating enemy vessels and sinking numerous submarines. In May 1941, the German battleship Bismarck was discovered by a PBY Catalina flying out of Castle Archdale Flying boat base , Lower Lough Erne , Northern Ireland. A flight of Catalinas spotted the Japanese fleet approaching Midway Island , beginning the Battle of Midway . On 3 April 1940,

6438-566: The war). Porte also acquired permission to modify and experiment with the Curtiss aircraft. The Curtiss H-4s were soon found to have a number of problems; they were underpowered, their hulls were too weak for sustained operations and they had poor handling characteristics when afloat or taking off. One flying boat pilot, Major Theodore Douglas Hallam, wrote that they were "comic machines, weighing well under two tons; with two comic engines giving, when they functioned, 180 horsepower; and comic control, being nose heavy with engines on and tail heavy in

6525-415: The wing structure. Fuel was gravity-fed to the engines from tanks within the upper wings, the fuselage was kept free of any fuel lines, aside from a fuel pump used to refill the wingtanks from an aft sump while at anchor . The crew were positioned so that they could readily communicate with one another There were three positions for machine guns , one set upon the nose and two staggered towards either side of

6612-400: The wings. Traditional manufacturing practices of the era were spurned in favour of new approaches, such as the deliberate avoidance of integrating the lower wing with the fuselage to leave the decking and inner wing section free to be independently worked upon. On 10 March 1925, the maiden flight of the first production aircraft was conducted; piloted by Henry Charles Biard . While this flight

6699-522: Was "easily the greatest commercial success in the history of marine aviation". Over 250 were built in Italy, Spain, Japan, The Netherlands and Germany. Numerous airlines operated the Dornier Wal on scheduled passenger and mail services. Wals were used by explorers, for a number of pioneering flights, and by the military in many countries. Though having first flown in 1922, from 1934 to 1938 Wals operated

6786-404: Was a major accomplishment for Supermarine's design team, headed by R. J. Mitchell . Supermarine had to expand its production capacity to keep up with demand for the type. During August 1925, the Southampton entered service with the Royal Air Force . The aircraft had gained a favourable reputation as the result of a series of long-distance flights. Further customers emerged for the type, including

6873-503: Was adopted. Sir Alan Cobham devised a method of in-flight refuelling in the 1930s. In the air, the Short Empire could be loaded with more fuel than it could take off with. Short Empire flying boats serving the trans-Atlantic crossing were refueled over Foynes; with the extra fuel load, they could make a direct trans-Atlantic flight. A Handley Page H.P.54 Harrow was used as the fuel tanker. The German Dornier Do X flying boat

6960-598: Was also adapted to power propeller-driven motor sleighs, which were used for high-speed transport and SAR duties on sea ice by the Finnish Air Force and Navy. Turning away from the broad arrow layout, Napier designed new engines using the more compact H engine layout. The 16-cylinder Napier Rapier produced 400 hp (300 kW) and the 24-cylinder Napier Dagger delivered just under 1,000 hp (750 kW). The engines were smaller than contemporary designs from other companies and Napier started afresh with

7047-527: Was developed in parallel to the civilian Empire flying boat, was one of the most powerful and widely used flying boats throughout the conflict, while Catalinas were one of the most produced ASW of the war, with over 2,661 being produced in the US alone. Flying boats were commonly utilized to conduct various tasks, from anti-submarine patrol to air-sea rescue and gunfire spotting for battleships. They would recover downed airmen and operate as scout aircraft over

7134-478: Was duly awarded the Mortimer Singer Prize . It was the first all-British aeroplane capable of making six return flights over five miles within five hours. In the U.S. Wanamaker's commission built on Glen Curtiss' previous development and experience with the Model F for the U.S. Navy which rapidly resulted in the America , designed under Porte's supervision following his study and rearrangement of

7221-517: Was effectively replaced in production by the Supermarine Scapa , which was one such derivative. The Supermarine Southampton was a twin-engine biplane flying boat, which was typically powered by a pair of Napier Lion twelve-cylinder engines. The engines are mount on pylons positioned between the wings in a tractor configuration. The engine installation enabled both maintenance and engine swaps to be performed without any interaction with

7308-400: Was found to handle "heavily" on takeoff, and required rather longer take-off distances than expected, the full moon on 5 August 1914 was selected for the trans-Atlantic flight; Porte was to pilot the America with George Hallett as co-pilot and mechanic. Curtiss and Porte's plans were interrupted by the outbreak of the First World War. Porte sailed for England on 4 August 1914 and rejoined

7395-547: Was given to replacing their world-famous product. Between the wars the Lion engine powered over 160 different aircraft types. In highly tuned racing versions, the engine could reach 1,300 hp (970 kW) and it was used to break many world height, air speed and distance records in aircraft and boats, delivering 1,375 hp (1,025 kW) in a highly tuned Lion for a water speed record of 100 mph (160 km/h) in 1933. In land speed records, Lion engines powered many of Sir Malcolm Campbell 's record breakers including

7482-434: Was largely successful, one of the wingtip floats sustained minor damage, leading to their angle of incidence being quickly adjusted to prevent reoccurrence prior to their complete redesign later on. Four days later, the contractor's trials were completed, thus the Southampton was promptly flown to Felixstowe, where it underwent type trials. These were passed with relative ease, including its ability to maintain altitude on only

7569-508: Was noticeably different from its UK and U.S.-built counterparts. It had wing-like protrusions from the fuselage, called sponsons , to stabilize it on the water without the need for wing-mounted outboard floats. This feature was pioneered by Claudius Dornier during the First World War on his Dornier Rs. I giant flying boat, and perfected on the Dornier Wal in 1924. The enormous Do X was powered by 12 engines and once carried 170 persons as

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