Short S.25 Sandringham: Британский летающий корабль для гражданских перевозок.

The Short S.25 Sandringham is a British civilian flying boat designed and originally produced by Short Brothers. They were produced as conversions of the widely used Short Sunderland, a military flying boat that was commonly used as a maritime patrol aircraft. Prior to the Sandringham, numerous Sunderlands which had been built for the Royal Air Force (RAF) had been converted to a civilian configuration as early as 1942 to fulfil a requirement of the British Overseas Airways Corporation (BOAC) for additional long range airliners. This need led to the development of the Short Hythe, which was a somewhat austere conversion due to its development taking place amid the Second World War. Around the conclusion to the conflict, Shorts was keen to produce a more refined and capable conversion of the Sunderland; the first prototype of which, which performed its maiden flight during November 1945, became known as the Sandringham I. The BOAC quickly sought to procure the Sandringham for its fleet, the demand for which led to production of the Sandringham II along with multiple further improved versions. Being operated initially alongside the Hythes, the more comfortable conditions onboard the Sandringhams led to them being given greater priority for usage and routing alike. Various other operators also procured the type, including TEAL, Qantas and Ansett. The Sandringham soon became outclassed by land based airliners, including the arrival of faster jetliners, thus their operations curtailed substantially during the late 1950s. The final scheduled service performed by the type was ended during the 1970s. A total of three Sandringhams are believed to have survived to the present day in preservation.

At the height of the Second World War, it was recognised that the UK's flagship airline, the British Overseas Airways Corporation (BOAC), required new aircraft in its inventory. The initial batch having been determined to be satisfactory, a further six Sunderlands were converted for similar purposes in 1943, along with a further batch of 12 during the following year. Following the end of the Second World War, BOAC opted to convert its Sunderlands to a less austere standard, making them more suitable for peace time operations; they became known as the Short Hythe. Specific changes including the replacement of the somewhat primitive bench seats with individual seats, initially permitting up to sixteen passengers to be accommodated on one deck in the initial H.1 configuration. Improved models, such as the H.2 variant, featured the addition of a promenade deck, while the H.3 configuration, featured an additional eight seats. Up to of mail could also be carried. Engines were standardised as the Bristol Pegasus 38.

Even prior to the end of the conflict, it has been identified that, while the converted Sunderlands had proved to be successful, there were areas for improvement. Every Sandringham was converted from surplus Sunderlands that had been formerly operated by RAF Coastal Command. Its conversion had been necessitated following the loss of an earlier Sandringham due to a cyclone that had torn it from its moorings.

The converted Sunderlands commenced operations with BOAC on its route between Poole Harbour, Dorset and Lagos, Nigeria in March 1943. The service was extended to Calcutta in May 1944, while VE Day, the end of the war in Europe, allowed the aircraft reverted to BOAC control. They continued on the India route, which was extended again to Rangoon in Burma following VJ Day. During 1946, BOAC's fleet of Hythes commenced long distance flights to Australia; on 12 May 1946, the Poole–Sydney route, which were operated in conjunction with the Australian airline Qantas, commenced. In August of that year, BOAC's Hythes were also deployed on services to Hong Kong on what was known as the Dragon route. It was in 1946 that the initial production models of the Sandringham proved themselves to be capable performers in the South American market. Multiple airlines in Argentina, as well as the Uruguayan airline CAUSA, became early operators of the type. Aerolíneas Argentinas would operate Sandringhams in a passenger role up until 1962, after which they saw use as freighters up until the late 1960s. In 1946, BOAC recognised that its existing fleet of flying boats was insufficient to perform all of the routes it envisioned, thus the airline placed its first order for the Sandringham. During the following year, the Sandringham 5 was introduced into service with BOAC, which referred to it as the "Plymouth class" and operated it mainly the company's Far East routes from Southampton via Alexandria to Hong Kong and Tokyo. The type quickly proved to be both reliable and popular with the travelling public, leading to BOAC ordering the improved Sandringham 6, which it called the Bermuda Class, in 1948. However, these operations were quickly overshadowed by other developments, with BOAC choosing to replace its flying boats on several routes with land based Lockheed Constellation airliners during 1949. The New Zealand based airline TEAL was another early operator of the Sandringham, using it primarily on the Auckland to Sydney route as well as flights to various Pacific Islands. In 1950, Qantas introduced the first of five aircraft which flew from the Rose Bay flying boat base on Sydney Harbour to destinations in New Caledonia, New Hebrides, Fiji, New Guinea and Lord Howe Island; two of these were purchased from TEAL and the other three were purchased from BOAC. Qantas kept its Sandringhams in regular service through to 1955.

Ex Ansett Sandringham (RAF Serial ML814 Short Sunderland MR5) c/n SH.974b. To RNZAF No.5 Squadron 1953 Fiji and became NZ4108. Hobsonville, New Zealand 1956–1963. Sold 1963 to Airlines of New South Wales. Converted to passenger configuration and registered VH BRF and named Islander. To Antilles Air Boats, Virgin Island as N158J in 1974. To Edward Hulton in the UK in 1979 as G BJHS Spirit of Foynes. Storm damaged and repaired. Sold to Kermit Weeks in 1992 and re registered N158J. On display at the Fantasy of Flight museum in Polk City, Florida, USA with Kermit Weeks and registered as N814ML on 16 September 1993. Ex Ansett Sandringham (RAF Serial JM715 Short Sunderland Mk III) flew for Tasman Empire Airways Ltd. (TEAL) of New Zealand purchased JM715 from the Air Ministry for conversion. After conversion at Short's Belfast factory, the aircraft was allocated the conversion number SH.55C and registered to TEAL, delivered from Southampton to Waitemata Harbour, Auckland on 29 October 1947 and was soon in service on the 1,300 mile Sydney–Auckland route. In May 1950, ZK AMH, was sold to Barrier Reef Airlines of Australia where it was renamed Beachcomber and registered VH BRC. Barrier Reef Airlines were subsequently taken over by the major Australian airline Ansett and became Ansett Flying Boat Services and operated out of Rose Bay, Sydney, Australia until 1974. The vast amounts of money required to keep the aircraft in flying condition were not available and in 1981, the aircraft was purchased for the National Aeronautical Collection by the Science Museum and is now on display at Solent Sky museum in Southampton, Hampshire, UK. Short S 25 Sandringham 7 Bermuda Class. c/n SH 57C. Built as a (RAF Serial JM719 Short Sunderland Mk III). Converted to Short S 25 Sandringham 7 Bermuda Class 1947 for BOAC British Register as G AKCO St. George. Sold to Sir Patrick Gordon Taylor 1954. Registered VH APG Frigate Bird III. Sold to Reseau Aerian Interinsulaire 1958. Registered F OBIP. Final Flight 1970 Papeete, Tahiti. Initially donated to Queensland Air Museum 1975. Relocation proved cost prohibitive. Acquired by Musée de l'Air et de l'Espace at Le Bourget Airport, 1977. Transported by French military to Paris in 1979 and placed on display, but was severely damaged during a storm on 8 February 1984. Under restoration since 2008, and as of January 2018 not currently viewable by the public.