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The Felixstowe F.3 and F.5 were British twin-engined biplane flying boats designed during the First World War by Lieutenant Commander John Cyril Porte RN at the naval air station at Felixstowe, Suffolk (renamed Seaplane Experimental Station in 1918). The F.3, first flown in February 1917, was the most numerous of the Felixstowe boats and flew anti-submarine patrols over the North Sea and the Mediterranean during the last year of the war. The F.5, intended to combine the best qualities of the F.2A and the F.3, arrived too late for wartime operations but became the standard flying boat of the Royal Air Force until 1925. Built under licence in the United States (as the F5L) and in Japan, it was the last of Porte's biplane flying boats and an important step in the evolution of the military flying boat.
Origins
The Felixstowe flying boats descended directly from the Curtiss America (H-1), a twin-engined biplane flying boat built in 1914 by Glenn Curtiss for an attempt to cross the Atlantic, on which Porte was to have been the pilot. When war broke out, Porte returned to Britain, rejoined the Royal Navy and was given command of the naval air station at Felixstowe. He persuaded the Admiralty to buy the two America prototypes and a batch of the similar Curtiss H-4, the first large flying boats in British service. These machines flew well but their hulls were too fragile for the rough waters of the North Sea, so Porte and his team designed new, stronger hulls with better hydrodynamic qualities. Fitted to the wings of an H-4, the first of these produced the Felixstowe F.1; a larger hull married to the flying surfaces of the Curtiss H-12 then gave the Felixstowe F.2, which entered production as the F.2A. The F.2A handled as well as the Curtiss boats in the air and far better on the water, but its offensive load was limited to two 230 lb (104 kg) bombs.
Felixstowe F.3
The F.3 was the first member of the family not derived directly from a Curtiss design. It was a larger and heavier development of the F.2A, with a greater wingspan and a longer hull, giving it a longer range and twice the bomb load of its predecessor (four 230 lb bombs). As it retained the same engines, the gain in size was paid for with lower speed and poorer agility, so the F.3 was less suited to fighting Zeppelins and enemy seaplanes than the F.2A. A new method of building the planing bottom was also introduced, but it proved disappointing and made the hull more prone to leaking.
The prototype (N64) first flew in February 1917, powered by two 320 hp (239 kW) Sunbeam Cossack engines. Large orders followed, the production aircraft being powered by 345 hp (257 kW) Rolls-Royce Eagle VIII engines. As with the F.2A, production was shared between several firms, including Short Brothers, Dick, Kerr & Co. and the Phoenix Dynamo Manufacturing Company, while 18 aircraft were built by the Dockyard Constructional Unit at Malta. The wooden hulls were often built by boatyards on the East Anglian coast, such as the Rowhedge Ironworks, Aldous at Brightlingsea and Rennie Forrestt at Wivenhoe, while the wings and tail surfaces came from aeronautical subcontractors, mainly in the Midlands. About 100 F.3s had been delivered by the Armistice; total production figures vary between sources, from 182 to more than 260 aircraft.
Felixstowe F.5
The F.5 was intended to combine the payload and range of the F.3 with the handling and performance of the F.2A. The prototype (N90), built at Felixstowe, flew in November 1917 (some sources give May 1918). It had a slightly deeper two-step hull, an entirely new wing of greater span and an open cockpit for the pilots, and in tests it proved superior to its predecessors. However, the gain was not considered sufficient to justify the cost of such a major change in production, and the design was revised to use as many F.3 components as possible, notably a barely modified F.3 wing. The production F.5 nevertheless introduced a plywood skin over the upper hull, replacing the doped fabric of earlier models. The result was an aircraft with a lower top speed and ceiling than both the F.2A and the F.3, but with greater endurance and good handling both in the air and on the water. A shortage of Eagle VIII engines meant that some aircraft were completed with the 325 hp Eagle VII, with a further loss of performance.
The F.5 was again built by several subcontractors, including Short Brothers, Dick, Kerr & Co., Phoenix Dynamo and the Gosport Aircraft Company, with S.E. Saunders and the Aircraft Manufacturing Company also involved and Boulton & Paul building hulls; about 160 were completed.
Felixstowe F5L
The US Navy was interested in the F.5, but wanted a version suited to American production methods and engines. Drawings reached the Naval Aircraft Factory (NAF) in Philadelphia in March 1918 and the design was immediately reworked: the Rolls-Royce Eagles were replaced by American Liberty 12A engines (initially 330 hp, later 400 hp), the hull was strengthened with a veneer skin instead of doped fabric, the streamlining was improved and dual controls were fitted. The prototype F5L flew on 15 July 1918, only four months after the drawings had arrived. A total of 227 were built: 137 by the NAF, 60 by Curtiss and 30 by Canadian Aeroplanes Limited in Toronto. Although often called the Curtiss F5L, most were in fact NAF-built. In 1919 the NAF built two F6Ls with an enlarged tail, which was later fitted retroactively to F5Ls in service; in 1922 the F5L was redesignated PN-5 and the F6L became the PN-6, the starting point of the long Naval Aircraft Factory PN series.
First World War
The F.3 entered service in early 1918 and operated alongside the F.2A from Felixstowe, Great Yarmouth, Killingholme, Cattewater, Dundee, Scapa Flow and Catfirth in the Shetland Islands. Unlike the F.2A, it was also deployed overseas and was in great demand in the Mediterranean. Its main role was anti-submarine patrol, where its larger bomb load was particularly valuable. From the East Coast stations, the flying boats flew the "Spider Web", an octagonal patrol grid centred on the North Hinder light vessel, covering the waters that almost every U-boat had to cross to reach its operating area. Although no submarine was sunk by flying boats alone during this period, constant patrols forced many U-boats to cross the area submerged, disrupted their passage and reduced the time they could spend on station. The F.3 was less popular with its crews than the more manoeuvrable F.2A. A Malta-based F.3 took part in the Allied attack on the Albanian port of Durazzo on 2 October 1918. The type was also used for trials of an early automatic landing device and of servo-operated controls. The F.3 was declared obsolete in September 1921.
The F.5 did not enter operational service before the end of the war.
Royal Air Force after the war
After the Armistice, the F.5 replaced the earlier Felixstowe boats and the Curtiss flying boats to become the RAF's standard flying boat. In summer 1919 an early production aircraft, N4044, made a demonstration tour of Scandinavia, covering 2,450 miles (3,943 km) in 27 days and returning to Felixstowe fully serviceable; its arrival at Kristiania (Oslo) in July 1919 was filmed. The F.5 remained in front-line service until it was replaced by the Supermarine Southampton from August 1925, and was also used to train flying-boat crews at Calshot.
The F.5 served as a testbed for new hull concepts. In 1922 S.E. Saunders was contracted to build a ventilated "hollow bottom" wooden hull, fitted to N178 and delivered to the Marine Aircraft Experimental Establishment in September 1924; the trials were short-lived and the aircraft was scrapped in 1925. In parallel, Short Brothers built an all-metal hull of duralumin, then a largely untried material, derived from the Short Silver Streak. Fitted with F.5 wings and tail surfaces, this aircraft (N177, known as the Short S.2) first flew on 5 January 1925 and was subjected to severe tests at Felixstowe, including being stalled onto the water from 30 ft (9 m). It withstood all the trials and, after a year, showed only negligible corrosion. The experiment overcame official resistance to metal hulls, led to the order for the prototype Short Singapore, and from then on all Short flying boats were of metal construction.
Canada
Several F.3s were given to Canada in 1919 as part of the Imperial Gift. In October 1920 the Canadian Air Board organised the first trans-Canada flight to assess the feasibility of future air mail and passenger services; the leg from Rivière-du-Loup to Winnipeg was flown by Lieutenant Colonel Robert Leckie and Major Basil Hobbs in an F.3. Six F.3s served with the Canadian Air Board and the Canadian Air Force between 1921 and 1923, mainly from Victoria Beach in Manitoba and Jericho Beach in Vancouver, for forest fire patrols, survey and transport flights. F.3 G-CYBT carried the first treaty annuity payments delivered by air. On 31 July 1922 it struck a submerged rock on Pikangikum Lake in northern Ontario; it was refloated and repaired on site with the help of F.3 G-CYEN, which flew in men and material, but the repair barely lasted the flight home and G-CYBT was written off at Victoria Beach on 29 August 1922. A few days later, on 8 September, G-CYEN was badly damaged at its mooring in a storm, and at the end of the month all remaining Canadian F.3s were struck off charge.
Portugal and Spain
On 22 March 1921 an F.3 of the Portuguese Naval Aviation, crewed by the naval aviators Sacadura Cabral and Ortins de Bettencourt, the navigator Gago Coutinho and the mechanic Roger Soubiran, made the first flight between mainland Portugal and Madeira. The Spanish Aeronáutica Naval also used the F.3, three of which were carried aboard the seaplane carrier Dédalo.
Civil use
Two F.3s, G-EAQT (ex-N4019) and G-EBDQ (ex-N4177), were placed on the British civil register. G-EAQT was converted by Short Brothers into a luxury "air yacht" with three lounges upholstered in green and grey for ten passengers. It was then sold to The Aerial Company Ltd in Australia, but was damaged in transit; other projects planned to use F.3s for a passenger and freight service between the mainland and Tasmania, but none came to fruition. In 1919 one of the F.5s built by the Gosport Aircraft Company was civil registered as the Gosport Flying Boat and shown at the First Air Traffic Exhibition (ELTA) in Amsterdam; Gosport also proposed fire-fighting and six-passenger civil derivatives, which remained on paper.
Japan
From 1921 Short Brothers delivered F.5s to the Imperial Japanese Navy, which then acquired a manufacturing licence. The aircraft, known as the Navy Type F.5, were built by the Yokosuka and Hiro naval arsenals and by Aichi until 1929, and remained in service until 1930. The Hiro arsenal then developed its own derivative, the Hiro H1H (Navy Type 15), whose later versions had an all-metal hull and which served until 1938.
United States
The F5L entered US Navy service at the end of the war and remained its standard patrol flying boat until 1928, when it was replaced by the PN-12; it was used for coastal patrol and for spotting for coastal artillery. F5Ls were also exported to the Brazilian Naval Aviation and the Philippine Air Service.
Surplus F5Ls also found a second career with the airlines. The Aeromarine Plane and Motor Company converted eight of them into the Aeromarine 75, carrying ten to fourteen passengers and mail. Operated by Aeromarine Airways from 1 November 1920 between Key West and Havana, they carried the first international air mail of the US Post Office, and later served seasonal routes between Miami, Bimini and Nassau, New York and Atlantic City, and Cleveland and Detroit. The first in-flight film was shown aboard an Aeromarine 75 in August 1921, during the Pageant of Progress exposition in Chicago. On 13 January 1923 the Aeromarine 75 "Columbus" suffered an engine failure between Key West and Havana and alighted in the Straits of Florida; the hull flooded in heavy seas and four passengers drowned before the ship H. M. Flagler rescued the other occupants. In 1928 the Atlantic Coast Airways Corporation of Delaware converted ex-Navy F5Ls to carry up to 25 passengers. One F5L ended its days in 1932 as a sandwich shop in Bradenton, Florida.
Military
Civil
No complete Felixstowe flying boat survives. In March 1919 the Naval Aircraft Factory sent a specially built F5L (A-3882), only partially skinned to reveal its structure, to an aeronautical exhibition in New York. Given to the Smithsonian Institution in 1920, it was handed back to the US Navy around 1930, but the Smithsonian kept the hull, a wing float, a propeller and a bomb. These parts are held by the National Air and Space Museum, currently in storage. The nose section of an unidentified Felixstowe flying boat is displayed at the Norfolk and Suffolk Aviation Museum at Flixton, England.
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