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Supermarine Southampton

From Alfawiki
Supermarine
IndustryAircraft manufacturing
Founded1913
FounderHubert Scott-Paine
Headquarters
Southampton
,
United Kingdom
ProductsFlying boats, military aircraft


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The Supermarine Southampton was a British flying boat developed and manufactured by Supermarine during the interwar years. It stood out as one of the period’s most accomplished flying boats.

Evolving from the experimental Supermarine Swan, the Southampton's development proceeded rapidly. This aircraft established a new benchmark for maritime aviation and marked a significant achievement for the Supermarine design team led by R. J. Mitchell. To satisfy production demands, Supermarine expanded its manufacturing facilities.

Introduced into service with the Royal Air Force in August 1925, the Southampton earned a strong reputation following several notable long-distance flights. Additional operators included the Imperial Japanese Navy, Argentine Naval Aviation, and the Royal Danish Navy. Civilian users such as Imperial Airways and Japan Air Transport also incorporated the type into their fleets. Notably, the Southampton supported one of the earliest ten-passenger cross-channel airline routes connecting England and France.

Background

The inception of the Southampton can be linked to an earlier Supermarine experimental model, the Supermarine Swan, which first flew on 25 March 1924 under the supervision of designer R.J. Mitchell. At that time, the Royal Air Force was nearing abandonment of large flying boats due to dissatisfaction with models like the Felixstowe F.5.[1] Impressed by the Swan’s trial performance at RAF Felixstowe, the British Air Ministry issued Specification R.18/24 and commissioned six production Southamptons from Supermarine. Remarkably, no prototype was constructed prior to production, reflecting the Air Ministry’s strong confidence in Mitchell’s design.[2]

The development cycle was notably brief. Mitchell and his team emphasised simplicity throughout, exemplified by their decision to eliminate conventional cross-bracing wires between wings. Departing from standard manufacturing methods of the time, they deliberately avoided attaching the lower wing directly to the fuselage, allowing independent access to both the decking and inner wing components during construction.[3]

Production and Testing

The first production unit took to the skies on 10 March 1925, with Henry Charles Biard at the controls. Although the flight was mostly successful, minor damage occurred to one of the wingtip floats, prompting an immediate adjustment to their angle of incidence to avoid similar issues before a full redesign was implemented. Just four days later, contractor testing concluded, and the Southampton was swiftly transported to Felixstowe for formal type trials. These evaluations were passed without significant difficulty, notably demonstrating the aircraft's capability to sustain altitude using only a single engine. Consequently, the RAF officially accepted delivery of the aircraft by mid-1925.

Following completion of the initial batch of six aircraft, additional orders for the Southampton were quickly placed. Due to limited production capacity at Supermarine’s original facility, a new factory was acquired across Southampton Water, where manufacturing operations were subsequently centralized. Throughout its production lifecycle, the Southampton underwent continuous enhancements, including upgrades to more advanced engines and replacing its wooden hull and wings with metal (duralumin) components. By the conclusion of production, 83 Southamptons had been built in total, excluding a single prototype three-engined variant known as the Southampton Mk X.

Various versions and derivatives emerged from the Southampton design, with the Supermarine Scapa serving as a direct successor that eventually superseded it in production.

Design

The Supermarine Southampton was a twin-engine biplane flying boat typically powered by two twelve-cylinder Napier Lion engines. These engines were mounted in a tractor configuration on pylons situated between the upper and lower wings. This arrangement allowed for engine maintenance and replacement without disturbing the wing structures. Fuel delivery relied on gravity feed from tanks located within the upper wings, keeping fuel lines out of the fuselage except for a pump used to replenish wing tanks from an aft sump while anchored. Crew positions were arranged to facilitate easy communication among personnel. Defensive armament comprised three machine gun stations: one positioned in the nose and two staggered along either side of the rear fuselage, providing rear gunners with a relatively broad field of fire.

The airframe evolved significantly over successive marks. The Southampton Mk I featured both hull and wings constructed from wood. In contrast, the Southampton Mk II introduced a hull made from a single layer of duralumin metal—replacing the Mk I’s double wooden bottom—which resulted in a weight reduction of approximately 900 lb (500 lb attributed to the lighter hull and 400 lb due to eliminated water absorption by wood). This weight saving extended operational range by close to 200 miles. All metal components were anodized to resist corrosion. In 1929, 24 Mk I aircraft were retrofitted with newly fabricated metal hulls in place of their original wooden ones. Later models were also equipped with metal propellers manufactured by Leitner-Watts. Some subsequent aircraft incorporated metal wings and are often referred to as Southampton Mk III, although this particular designation remains subject to debate.

Operational history

The initial Southamptons were introduced into RAF service in August 1925, with their first deployment being to No. 480 (Coastal Reconnaissance) Flight stationed at RAF Calshot.[4] Through a series of operational exercises, the Southampton demonstrated a reliable capability to operate autonomously, even under adverse weather conditions.[5] Andrews and Morgan noted that the Southampton rapidly established itself as the leading European flying boat of its time, a status confirmed by its extensive overseas missions.[6] The Argentine Naval Aviation utilized eight aircraft purchased by Argentina for coastal patrol duties.

Among the various roles undertaken by RAF Southamptons were several long-range formation flights aimed at "showing the flag." One of the most significant of these was a 43,500 km (27,000 mi) journey conducted between 1927 and 1929 by four Southamptons from the Far East Flight. This expedition commenced from Felixstowe, proceeding through the Mediterranean and India to Singapore, then onward to Australia before returning to Britain.[7] These aircraft incorporated multiple technical modifications including enlarged tinned steel fuel tanks, increased oil capacity, expanded radiator surface area, and the removal of all armaments. According to Andrews and Morgan, these flights significantly enhanced the Southampton’s public profile and bolstered Supermarine’s reputation as well.[8] Additionally, practical advancements emerged from these missions, such as new anti-corrosion methods developed based on operational feedback.[9]

While the RAF was the principal operator of the type, additional Southamptons were supplied internationally. Argentina acquired eight new aircraft; Turkey received six units; and Australia obtained two former RAF Mk I models.[10] The Imperial Japanese Navy purchased one example which was subsequently converted into an 18-passenger cabin airliner for Japan Air Transport.[11] Although the United States Navy requested pricing information, no purchase ensued.[11] Furthermore, one RAF Southampton was loaned to Imperial Airways with British civil registration G-AASH for a three-month period beginning December 1929, substituting for a crashed Short Calcutta on the airmail route between Genoa and Alexandria.[12][13]

Variants

The Southampton series featured multiple versions distinguished primarily by their powerplants:

  • Mk I
Equipped with Napier Lion V engines and featuring a wooden hull; 23 units produced.[14]
  • Mk II
Powered by Napier Lion Va engines with a metal (duralumin) hull; 39 built.[15]
  • Mk III
Similar configuration to Mk II but with metal wings; exact production numbers uncertain and designation subject to debate.[16]
A three-engine variant fitted with Armstrong Siddeley Jaguar engines; only one constructed for the Royal Danish Navy.
An experimental model based on Southampton II featuring an all-metal hull; single example built.
  • Argentina
Powered by Lorraine-Dietrich 12E engines; comprised five wooden-hulled and three metal-hulled aircraft.[14]
  • Turkey
Utilized Hispano-Suiza 12Nb engines; six units manufactured.[17]
  • Experimental engines
Existing airframes were fitted with Bristol Jupiter IX and Rolls-Royce Kestrel engines for evaluation purposes; trials with the Kestrel contributed to the development of the Scapa.
  • Mk IV
Prototype of the Supermarine Scapa.

Operators

File:RAAF Supermarine Southampton (044869).jpg
RAAF Supermarine Southampton

Military users

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Civilian users

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Preserved aircraft

The Supermarine Southampton I with registration N9899, featuring its restored wooden fuselage, is exhibited at the Royal Air Force Museum located in Hendon.[21]

Technical specifications (Southampton II)

File:Supermarine Southampton 3-view L'Air January 1,1927.png
Supermarine Southampton three-view illustration from L'Air, January 1, 1927

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See also

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References

  1. ↑ Andrews & Morgan 1981, pp. 90, 96–97.
  2. ↑ Andrews & Morgan 1981, p. 97.
  3. ↑ Andrews & Morgan 1981, pp. 97–98.
  4. ↑ Andrews & Morgan 1981, p. 111.
  5. ↑ Andrews & Morgan 1981, pp. 98–99.
  6. ↑ Andrews & Morgan 1981, pp. 100–104.
  7. ↑ Andrews & Morgan 1981, pp. 99–102.
  8. ↑ Andrews & Morgan 1981, pp. 100–103.
  9. ↑ Andrews & Morgan 1981, p. 108.
  10. ↑ Andrews & Morgan 1981, pp. 109–111.
  11. ↑ 11.0 11.1 Andrews & Morgan 1981, p. 104.
  12. ↑ Jackson 1974, p. 443.
  13. ↑ Andrews & Morgan 1981, pp. 111–112.
  14. ↑ 14.0 14.1 Andrews & Morgan 1987, p. 357.
  15. ↑ Andrews & Morgan 1987, pp. 357–358.
  16. ↑ Andrews & Morgan 1981, pp. 104–106.
  17. ↑ Andrews & Morgan 1987, p. 358.
  18. ↑ Thetford 1958, p. 385.
  19. ↑ Stroud 1986, p. 214.
  20. ↑ Jackson 1978, pp. 445Template:Ndash446.
  21. ↑ Lua error in Module:Citation/CS1/Configuration at line 2123: attempt to index field '?' (a nil value).

Sources

  • Andrews, Charles Ferdinand; Morgan, Eric B. Supermarine Aircraft since 1914. London: Putnam, 1981. ISBN 978-0-370-10018-0.
  • Andrews, Charles Ferdinand; Morgan, Eric B. Supermarine Aircraft since 1914. London: Putnam, 1987. ISBN 978-0-85177-800-6.
  • Jackson, A. J. British Civil Aircraft since 1919. London: Putnam, 1974. ISBN 978-0-370-10014-2.
  • Jackson, A. J. "Civil Southampton." Aeroplane Monthly, vol. 6, no. 6, 1978, pp. 444–446.
  • Kightly, James. "Database: Supermarine Southampton." Aeroplane Monthly, vol. 48, no. 4, 2020, pp. 75–87.
  • Stroud, John. "Wings of Peace." Aeroplane Monthly, vol. 14, no. 4, 1986, p. 214.
  • Thetford, Owen Gordon. Aircraft of the Royal Air Force 1918–58. London: Putnam, 1958.

Further reading

  • Hillman, Jo; Higgs, Colin. Supermarine Southampton: The Flying Boat that Made R.J. Mitchell. Air World, 2020. ISBN 978-15267-8-497-1.
  • Lipscombe, Trevor. "RAF Far East Flight: Part 1: UK–Singapore." The Aviation Historian, no. 25, 2018, pp. 76–88.
  • Pegram, Ralph. Beyond the Spitfire: The Unseen Designs of R.J. Mitchell. The History Press, 2016. ISBN 978-0-7509-6515-6.
  • Shelton, John. Schneider Trophy to Spitfire – The Design Career of R.J. Mitchell. Sparkford: Hayes Publishing, 2008. ISBN 978-1-84425-530-6.
  • Spooner, Stanley (ed.). "The Supermarine 'Southampton'." Flight, vol. 10, no. 744–747, 18 November 1926.
  • Spooner, Stanley (ed.). "The Supermarine 'Southampton'." Flight, vol. 10, no. 759–764, 25 November 1926.

External links

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