Engineering:Stampe et Vertongen SV.5 Tornado

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SV.5 Tornado
Stampe et Vertongen SV.5 photo Le Pontential Aérien Mondial 1936.jpg
A Latvian Air Force SV.5
Role Military trainer
National origin Belgium
Manufacturer Stampe et Vertongen
Designer George Ivanow[1]
First flight September 1933[2]
Primary user Belgian Air Force [3]
Number built 31, plus one SV.9[3]

The Stampe et Vertongen SV.5 Tornado was a military trainer aircraft designed and built in Belgium in the 1930s.[4][5] It saw service with the Belgian Air Force [6] and Latvian Air Force ,[7] and Latvian firm VEF purchased a production license, although it is uncertain whether it built any examples.[6]

Design and development

The SV.5 was Stampe et Vertongen's response to a 1933 requirement by the Belgian Air Force for a two-seat training biplane with aerobatic capabilities.[1] Jean Stampe directed designer George Ivanow to update the company's RSV.22 to meet the new specifications, but the resulting design was an entirely new aircraft with only a superficial resemblance to its predecessor.[1] It was a conventional, single-bay biplane with staggered wings of unequal span.[8] The pilot and instructor sat in open cockpits in tandem[8] and the aircraft was powered by an Armstrong Siddeley Serval radial engine[9] in the nose, enclosed in a Townend ring.[7] The main units of the fixed undercarriage were divided and the tail was supported by a tailwheel.[8] It could be equipped for bombing or gunnery training.[5] Unlike earlier Stampe et Vertongen products, which had wooden structures, the SV.5 airframe was riveted together from steel tube in a method inspired by Hawker in the United Kingdom.[1]

The prototype first flew in September 1933,[2] and on 16 October 1934, the Belgian Air Force evaluated it against five competitors: the Avro 626, Breda Ba.25, Fairey Fox III, LACAB T-7, and the Renard R.34.[7] A sixth competitor, the Caproni Ca.113, suffered an accident on arrival and was disqualified.[7] The SV.5 outclassed all its rivals in the maintainability trials, and was less expensive than any of them.[7] However, the Avro 626 was selected for political reasons.[7]

The SV.5 nevertheless found a customer in the Latvian Air Force , which was seeking a similar aircraft.[7] When a study mission to Belgium confirmed the type's suitability, the Latvian government negotiated the purchase of ten examples in exchange for 5,700 tonnes of wheat.[7] These machines were slightly different from the prototype, with a NACA cowl in place of the Townend ring, a redesigned horizontal stabiliser, and simplified main undercarriage.[7] Germany would not permit the overflight of the aircraft, so in September 1936 they were shipped disassembled to Riga, where Jean Stampe oversaw their assembly by VEF.[6]

In the meantime, the Belgian Air Force finally placed an order for twenty SV.5s.[6] Stampe et Vertongen delivered these between October 1936 and mid 1937.[6]

Variants

Ivanow used the SV.5 as the basis for a family of follow-on designs with only minor variations:[6]

SV.6
version with 260-kW (350-hp) Armstrong Siddeley Cheetah IX
SV.7
version with 378-kW (507-hp) Pratt & Whitney Wasp Junior, also with spoilers under the upper wing
SV.8
version with 180-kW (240-hp) Armstrong Siddeley Lynx IV
SV.9
SV.5 with metal, variable-pitch propeller, and upper wings moved 2 cm (1 in) rearward to improve centre of gravity

Of these, only a single SV.9 was built. This aircraft was exported to Latvia, together with a license for production by VEF. Although rumours exist that VEF built examples of the type, this cannot be confirmed.[6]

Operators

 Belgium
 Latvia

Specifications (SV.5)

Data from Jouhaud 1999, p.86

General characteristics

  • Crew: two
  • Length: 8.04 m (26 ft 4 in)
  • Wingspan: 10.52 m (34 ft 6 in)
  • Height: 3.04 m (10 ft 0 in)
  • Wing area: 26.7 m2 (287 sq ft)
  • Empty weight: 890 kg (1,960 lb)
  • Gross weight: 1,340 kg (2,950 lb)
  • Powerplant: 1 × Armstrong Siddeley Cheetah X , 250 kW (340 hp)

Performance

  • Maximum speed: 272 km/h (151 mph, 131 kn)
  • Endurance: 3 hours 30 minutes
  • Service ceiling: 7,150 m (23,500 ft)

Notes

  1. ↑ 1.0 1.1 1.2 1.3 Jouhaud 1999, p.82
  2. ↑ 2.0 2.1 Jouhaud 1999, p.88
  3. ↑ 3.0 3.1 Jouhaud 1999, p.82–85
  4. ↑ 4.0 4.1 Taylor 1989, p.839
  5. ↑ 5.0 5.1 The Illustrated Encyclopedia of Aircraft, p.2955
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 Jouhaud 1999, p.85
  7. ↑ 7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9 Jouhaud 1999, p.84
  8. ↑ 8.0 8.1 8.2 Jouhaud 1999, p.87
  9. ↑ Jouhaud 1999, p.83

References

  • The Illustrated Encyclopedia of Aircraft. London: Aerospace Publishing. 
  • Gerdessen, Frederik. "Estonian Air Power 1918 – 1945". Air Enthusiast, No. 18, April – July 1982. pp. 61–76. ISSN 0143-5450.
  • Jouhaud, Reginald (1999). Les Avions Stampe. Amsterdam: Wimpel. 
  • Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions. 



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