General Aircraft Monospar ST-25

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Monospar ST-25
Monospar.jpg
Monospar ST-25 Jubilee of Eloy Fernández Navamuel during the Spanish Civil War [1]
Role
National originUnited Kingdom
Manufacturer General Aircraft Ltd, Hanworth
First flight19 June 1935
Produced1935–1939
Number built60
Developed from General Aircraft Monospar ST-10

The General Aircraft Monospar ST-25 was a British 1930s light twin-engined utility aircraft.

Contents

Design and development

The Monospar ST-25 was a low-wing cantilever monoplane with a fabric-covered metal structure. The monospar name came from the use of a single spar in the wing structure, that had been developed by H J Stieger. The cabin was enclosed with five seats. It was based on the GAL Monospar ST-10, with the addition of a folding seat for a fifth passenger, extra side windows, and the addition of a radio receiver. On 19 June 1935, the prototype (G-ADIV) made its first flight at Hanworth Air Park. It was designated Monospar ST-25 Jubilee, to honour the 25th anniversary of the reign of King George V. [2]

Operational history

Variants

Monospar ST-25 Universal, after conversion from ST-25 De Luxe GAL Monospar ST-25 0792.jpg
Monospar ST-25 Universal, after conversion from ST-25 De Luxe
Monospar ST-25 Universal Monospar ST-25.jpg
Monospar ST-25 Universal
Monospar ST-25 Jubilee
(1935-1936) Single fin and rudder. 30 built. [2]
Monospar ST-25 De Luxe
One Monospar ST-25 Jubilee with a large single fin and two Niagara II engines, later converted to the prototype Monospar ST-25 Universal, with twin fins. [2]
Monospar ST-25 Ambulance
Variants of both Monospar ST-25 Jubilee and ST-25 Universal, with a large door on the starboard side to allow a stretcher to be loaded. [2]
Monospar ST-25 Universal
(1936-1939) Twin fin and twin rudder. 29 built, including the conversion of the De Luxe. [2]
Monospar ST-25 Freighter
A variant of the Monospar ST-25 Universal, with a large freight door but without the passenger seating. [2]
GAL.26
One modified Monospar ST-25 Jubilee, fitted with two Cirrus Minor I engines in 1936. [2]
GAL.41
One experimental aircraft based on the Monospar ST-25 Universal. A new fuselage was built containing a pressurized section with two seats. Its purpose was to test possible pressurization systems for a proposed airliner, the GAL.40. [5] [lower-alpha 1] The GAL.41 flew for the first time on 11 May 1939, [7] and was grounded in 1941. [8]

Operators

Flag of Aden (1937-1963).svg  Aden
Flag of Australia (converted).svg  Australia
Flag of Canada (Pantone).svg  Canada
Flag of Denmark.svg  Denmark
Flag of Estonia.svg  Estonia
Flag of France.svg  France
Flag of the Netherlands.svg  Netherlands
Flag of New Zealand.svg  New Zealand
Flag of Romania.svg  Romania
Flag of Spain (1931-1939).svg  Spain
Flag of Spain.svg  Spain
Flag of Turkey.svg  Turkey
Flag of the United Kingdom.svg  United Kingdom

Specifications (Monospar ST-25 Jubilee)

Data from Jackson, 1973

General characteristics

Performance

See also

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References

Notes

  1. The Fairey FC1 was selected to meet the requirement for the airliner. [6]

Citations

  1. Howson, 1990
  2. 1 2 3 4 5 6 7 Jackson 1973, pp. 215–220
  3. PIET VAN ASCH – New Zealand's Aerial Mapping Pioneer at wings.net.nz Archived 9 February 2013 at the Wayback Machine
  4. Ogden (2009)
  5. Jarrett 1990 , pp. 734–736
  6. Jarrett 1990, p. 735
  7. Jarrett 1990 , p. 736
  8. General Aircraft Monopar ST-25 – British Aircraft of World War II accessed 1 July 2017]
  9. 1 2 3 4 5 6 Stroud 1988 , p. 238
  10. Estonian National Archives Photo Database, EFA.446.0.194553
  11. "Les Nakajima Ki-43 " Oscar " dans l'Armée de l'Air, une fausse bonne idée" (in French). 21 February 2016.
  12. "Rond vliegveld" (in Dutch). Archived from the original on 25 February 2014.
  13. Stroud 1988 , p. 237
  14. Stroud 1988 , pp. 237–238

Bibliography