General Aircraft Monospar ST-25
Encyclopedia
The General Aircraft Monospar ST-25 was a British 1930s light twin-engined utility aircraft.
in the wing structure that had been developed by H J Stieger. The cabin was enclosed with five seats. It was based on the earlier GAL Monospar ST-10, with the addition of folding seat for a fifth passenger and the addition of a radio receiver. First flying on 19 June 1935, the type was named Jubilee, and also numbered 25, in honour of the 25th anniversary of the reign of King George V.
Monospar ST-25 De Luxe
Monospar ST-25 Ambulance
Monospar ST-25 Universal Twin fin and twin rudder. 29 built, including the conversion of the De Luxe.
Monospar ST-25 Freighter
GAL.26
GAL.41
Spain
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 sparSpar
In sailing, a spar is a pole of wood, metal or lightweight materials such as carbon fiber used on a sailing vessel. Spars of all types In sailing, a spar is a pole of wood, metal or lightweight materials such as carbon fiber used on a sailing vessel. Spars of all types In sailing, a spar is a...
in the wing structure that had been developed by H J Stieger. The cabin was enclosed with five seats. It was based on the earlier GAL Monospar ST-10, with the addition of folding seat for a fifth passenger and the addition of a radio receiver. First flying on 19 June 1935, the type was named Jubilee, and also numbered 25, in honour of the 25th anniversary of the reign of King George V.
Operational history
- The last flying Monospar ST-25 (ZK-AFF), of Piet Van Asch's New Zealand Aerial Mapping Ltd was lost in 1986 as a result of a hangar fire.
- The last surviving Monospar ST-25 (OY-DAZ), an ST-25 Ambulance, was fully restored during 1989-1999, and now displayed in Egeskov Veteranmuseum at Egeskov CastleEgeskov CastleEgeskov Castle is located in the south of the island of Funen, Denmark. The castle is Europe's best preserved Renaissance water castle.-History:Egeskov's history dates to the 14th century...
, Denmark.
Variants
Monospar ST-25 Jubilee Single fin and rudder. 30 built.Monospar ST-25 De Luxe
- One Monospar ST-25 Jubilee with large single fin and two Niagara IIPobjoy Niagara|-See also:-Bibliography:* Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9...
engines, later converted to the prototype Monospar ST-25 Universal, with twin fins.
Monospar ST-25 Ambulance
- Variants of both Monospar ST-25 Jubilee and ST-25 Universal, with a large door on starboard side to allow a stretcher to be loaded.
Monospar ST-25 Universal Twin fin and twin rudder. 29 built, including the conversion of the De Luxe.
Monospar ST-25 Freighter
- A variant of the Monospar ST-25 Universal, with a large freight door but without the passenger seating.
GAL.26
- One modified Monospar ST-25 Jubilee, fitted with two Cirrus Minor I engines in 1936.
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. The GAL.41 flew for the first time 11 May 1939, and was grounded in 1941.
Operators
- Adelaide Airways
- Eastern Canada Air Lines (5 × ST-25 Freighters, delivered in 1936)
- New Zealand Aerial Mapping
- Royal New Zealand Air ForceRoyal New Zealand Air ForceThe Royal New Zealand Air Force is the air arm of the New Zealand Defence Force...
- Royal Romanian Air ForceRoyal Romanian Air ForceThe Forţele Aeriene Regale ale României , or simply Forţele Aeriene Române was the Air Arm of Royal Romanian forces in World War II...
Spain
- Spanish Republican Air ForceSpanish Republican Air ForceThe Spanish Republican Air Force, , was the air arm of the Second Spanish Republic, the legally established government of Spain between 1931 and 1939...
- Spanish Air ForceSpanish Air Force-The early stages:Hot air balloons had been used with military purposes in Spain as far back as 1896. In 1905, with the help of Alfredo Kindelán, Leonardo Torres y Quevedo directed the construction of the first Spanish dirigible in the Army Military Aerostatics Service, created in 1896 and located...
- Turkish Government (2 × ST-25 Freighters for parachute training delivered in 1937)
- Turkish Mapping Aviation
- Crilly Airways
- Royal Aircraft EstablishmentRoyal Aircraft EstablishmentThe Royal Aircraft Establishment , was a British research establishment, known by several different names during its history, that eventually came under the aegis of the UK Ministry of Defence , before finally losing its identity in mergers with other institutions.The first site was at Farnborough...
(2 × Jubilees used for radio development) - Royal Air ForceRoyal Air ForceThe Royal Air Force is the aerial warfare service branch of the British Armed Forces. Formed on 1 April 1918, it is the oldest independent air force in the world...
(impressed civil aircraft used during the second world war)