Short Sandringham

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 prolific 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.

Design and development

Background

At the height of the Second World War, it was recognised that the UK's flagship airliner, the British Overseas Airways Corporation (BOAC), required new aircraft in its inventory. It was promptly recognised that, as the Short Sunderland military flying boats operated by the Royal Air Force (RAF) bore considerable similarities to the Short Empire, a civilian flying boat, there was few challenges posed by converting excess Sunderlands for civil purposes if deemed necessary. Accordingly, during December 1942, work started on six Sunderland IIIs from Short's Rochester works, stripping them of their armaments and military fittings, being instead refitted for airline purposes, having austere bench-type seats installed within the cabin along with civil markings and registrations across their exteriors.. On 26 December 1942, the first of the conversions performed its maiden flight. After being delivered to BOAC, these flying boats were quickly used on the airline's Poole-West Africa service, transporting both passengers and air mail alike.Barnes 1967, p. 398.

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.Barnes 1967, pp. 398–399.London 2003, pp. 203–204. 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.Jackson 1988, p. 152.London 2003, p. 215.

Post-war conversions

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. Specifically, the temporary and somewhat basic fairings implemented to cover turret positions could be replaced by more sophisticated low-drag counterparts to improve aerodynamic efficiency. Deciding to proceed with this work, in November 1945, Shorts flew a thus refined conversion of BOAC's Sunderlands from their Rochester works. Along with the revised low-drag fairings on both the nose and tail, it benefitted from a refurbished interior; this flying boat was referred to as the ''Sandringham''; it subsequently became known as the ''Sandringham 1'' to distinguish it from the more advanced conversions which later followed it.

During January 1946, a certificate of airworthiness was issued for the Sandringham I, it entered service with BOAC in June of that year after completing operational trials with RAF Transport Command. Around this time, BOAC opted to have all of its Sunderlands refurbished to a standard akin to contemporary airliners. Shorts had envisioned BOAC issuing a prompt order for Sandringhams, but the first order for the type came from the Argentine airline Compañía Argentina de Aeronavegación Dodero instead. The airline had been keen to procure Sunderlands were its South American intercity routes, and had been impressed by information provided by Shorts on the Sandringham conversation. Ordered in two batches, one for short-haul routes and the other for longer distances, the first ''Sandringham II'' was launched to great ceremony at Belfast on 17 November 1945.

There were several differences between the Sandringham I and the following production flying boats. While the first prototype had retained the Pegasus engines, common to both the Sunderland III and Hythe, later models of the Sandringham, which were converted by Short and Harland Ltd at Belfast Harbour, were based on the later Sunderland V, which were instead powered by Pratt & Whitney "Twin Wasp" engines.Barnes 1967, pp. 400-401. Every Sandringham was converted from surplus Sunderlands that had been formerly operated by RAF Coastal Command.

During 1963, an additional conversion of a former Royal New Zealand Air Force Sunderland V was carried out by Ansett to a similar standard to the Sandringham. This aircraft, named ''Islander'', was fitted with a 43-seat interior.London 2003, p. 226. Its conversion had been necessitated following the loss of an earlier Sandringham due to a cyclone that had torn it from its moorings.Barnes 1967, pp. 406-407.

Operational history

The converted Sunderlands commenced operations with BOAC on its route between Poole Harbour, Dorset and Lagos, Nigeria, in March 1943. Following a proving flight to British India, the Sunderlands were transferred in October 1943 to flights between Poole and Karachi, via Gibraltar and Cairo. As Egypt was under military control, the aircraft were given military serial numbers and operated as part of RAF Transport Command.London 2003, p. 204. 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.Barnes 1967, p. 399.

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.Barnes 1967, p. 400.

It was in 1946 that the initial production models of the Sandringham proved themselves to be capable performers in the South American market.Barnes 1967, p. 401. Multiple airlines in Argentina, as well as the Chilian airline Compañía Aeronáutica Uruguaya, became early operators of the type. The Argentine airline Aerolíneas Argentinas would operate Sandinghams in a passenger capacity up until 1962, after which they saw use as freighters in the region up until the late 1960s.Barnes 1967, pp. 401-402.

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.Barnes 1967, p. 403. 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.Barnes 1967, pp. 403-404. 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. The airline opted to discontinue Sandringham operations on 19 December 1949, selling its fleet onto other airlines.Barnes 1967, pp. 404-405. 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.

The Sandringham was used by Ansett Flying Boat Services on the Sydney (Rose Bay) to Lord Howe Island scheduled service until 1974. One of Ansett's Sandringhams was converted from a S-25 Sunderland previously owned by the Royal New Zealand Air Force. The Sandringham was also operated by the Norwegian airline DNL – Norwegian Airlines between 1946 and 1952 on the domestic service from Oslo to Tromsø. This customer's small fleet was specially equipped with flying in cold prevailing conditions, although services had to be halted during the winter regardless; they also featured the same Air-to-Surface Vessel radar sets as fitted to the wartime Sunderland V for navigation purposes, helping the crew avoid mountainsides and safely operate from the fjords.

In October 1954, Captain Sir Gordon Taylor flew his newly acquired Sandringham 7 from the UK to Australia to begin a series of flying boat cruises of the south Pacific. The aircraft later passed to Réseau Aérien Interinsulaire in Tahiti and is presently stored at the Musée de l'Air et de l'Espace at Paris Le Bourget.

One of the last operators of the Sandringham was Antilles Air Boats in the Virgin Islands of the Caribbean which flew the aircraft in scheduled passenger service into the 1970s with flights from the Charlotte Amalie Harbor Seaplane Base on Saint Thomas and the Christiansted Harbor Seaplane Base on Saint Croix among other destinations.http://www.airliners.net, photos of Antilles Air Boats Short Sandringham in the U.S. Virgin Islands

Variants

;Hythe
:Modification of Sunderland III for BOAC, with seats for 16–24 passengers. 23 converted.London 2003, pp. 278–279, 281.
;Sandringham 1
:Full civil conversion of Sunderland 3 for BOAC, accommodating 24 day or 16 sleeper passengers, and powered by four 1,030 hp (768 kW) Bristol Pegasus 38 engines. One converted.Jackson 1988, pp. 152–153.
;Sandringham 2
:Civil conversion of Sunderland 5 for Argentine airline Dodero, accommodating 45 day passengers. Powered by four R-1830-92 engines, three conversions.Jackson 1988, p. 153.
;Sandringham 3
:Conversion of Sunderland 5 with dining room and galley on upper deck and seats for 21 on lower deck. Two converted.
;Sandringham 4
:Four converted for TEAL of New Zealand (''Tasman'' class). Seating for 30 passengers. Two were sold to Qantas and operated by them between 1950 and 1955, with the remaining two sold to Ansett.Barnes 1967, p. 405.
;Sandringham 5
:Nine converted for BOAC (''Plymouth'' class), accommodating 22 day or 16 sleeper passengers.Jackson 1988, p. 154. Three of these were sold to Qantas which operated them between 1951 and 1955.
;Sandringham 6
:Radar equipped aircraft for Norwegian airline DNL. 37 passengers. Five converted.
;Sandringham 7
:Thirty seat aircraft for BOAC (''Bermuda'' class). Three converted.Jackson 1988, p. 155.
;Islander
:An additional civil conversion by Ansett officially described as a Sunderland Mark V (Modified).

Operators

;
* Aerolíneas Argentinas
* Sociedad Mixta Aviación del Litoral Fluvial Argentino (ALFA)
* Cooperativa Asociación Argentina de Aeronavegantes
* Compañía Argentina de Aeronavegación Dodero
;
* Ansett
* Barrier Reef Airways
* QANTAS
;
* Reseau Aerien Interinsulaire (RAI) and successor Air Polynesie (now Air Tahiti) in French Polynesia
;
* TEAL
;
* Det Norske Luftfartselskap
;
* BOAC
;
* Compañía Aeronáutica Uruguaya S.A. (CAUSA)
;
* Antilles Air Boats

Survivors

* 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 not currently viewable by the public.

Specifications (Sandringham 5)

See also

References

Citations

Bibliography

* Barnes, C. H. ''Shorts Aircraft since 1900.'' London: Putnam, 1967
* Jackson, A. J. ''British Civil Aircraft since 1919 – Volume Three.'' London: Putnam & Company Ltd, 1974. .
* Jackson, A. J. ''British Civil Aircraft 1919–1972: Volume Three.'' London: Putnam, 1988. .
* London, Peter. ''British Flying Boats.'' Stroud, UK: Sutton Publishing, 2003. .
*

Further reading

"Short Sandringham: Sunderland's Civil Version: Improved Form and Interior."
''Flight'', 19 July 1945, Volume XLVIII, Number 1908. pp. 63–65.

External links

video of a Short Sandringham (misidentified as a Sunderland) landing on water
from the old movie titled "el delito"
{{Short Brothers aircraft

Short Brothers aircraft
Flying boats
1940s British airliners
Four-engined tractor aircraft
High-wing aircraft
Four-engined piston aircraft