|Role||Experimental Aircraft, Fighter|
|Manufacturer||Gloster Aircraft Company|
|Primary user||Swedish Air Force|
|Developed from||Gloster Sparrowhawk|
The Gloster Grouse was a British biplane of the 1920s developed by the Gloster Aircraft Company. Often referred to as the prototype to the Gloster Grebe, the Grouse originally built as an experimental aircraft and then later developed as a trainer. Despite its compact design and maneuverability, the Grouse was not in itself a commercial success, although it formed the basis for the Gloster Grebe and Gamecock fighters which were used by Britain's Royal Air Force into the 1930s.
Design and development
The design of the Gloster Grouse was an experiment to combine the advantages of the monoplane with those of a biplane. It was designed by English aviation engineer and aircraft designer Henry Folland, the designer of the S.E.5 among other aircraft. The top wing had a thick, high lift aerofoil, while the bottom wing was smaller, with a thinner medium lift aerofoil set at a smaller angle of attack than the upper wing. This arrangement was meant to produce high lift for take-off with low drag.
To test this arrangement, new wings were fitted to a modified Gloster Sparrowhawk fuselage to produce the Gloster Grouse. The resulting aircraft was a small biplane with single bay wooden wings. The fuselage was rather short, and while the aircraft used the fuselage of a two-seat Sparrowhawk II, the forward cockpit was faired over, leaving a single seat for the pilot in an open cockpit.The Grouse retained the Bentley BR2 rotary engine of the Sparrowhawk driving a two blade propeller.
The prototype Grouse Mk I (registration G-EAYN) first flew in 1923, proving during testing that Folland's theories were correct. After evaluation by the RAF, orders were placed for three fighter derivatives, to be powered by Armstrong Siddeley Jaguar radial engines, designated Gloster Grebe.
The Grouse II was unsuccessful in meeting the RAF's needs, a new version of the Avro 504, the 504N, also powered by the Lynx engine, being preferred. The Swedish Army Aviation Company purchased the Grouse II prototype as an advanced trainer. The aircraft was delivered just a short time before the Swedish Air Force was founded in the summer of 1926. During its time in Sweden, it only flew 109 hours. The pilots were impressed with the good performance of the aircraft, but no more Gloster Grouses were provided to the Air Force.
Specifications (Grouse II)
Data from Gloster Aircraft since 1917 
- Crew: 2
- Length: 20 ft 4 in (6.19 m)
- Wingspan: 27 ft 10 in (8.47 m)
- Height: 9 ft 5 in (2.86 m)
- Wing area: 205 ft² (19.0 m²)
- Empty weight: 1,395 lb (619 kg)
- Loaded weight: 2,118 lb (960 kg)
- Powerplant: 1 × Armstrong Siddeley Lynx seven-cylinder air cooled radial engine, 185 hp (138 kW)
- Maximum speed: 120 mph (104 knots, 193 km/h) at sea level
- Service ceiling: 18,000 ft (5,500 m)
- Wing loading: lb/ft² (kg/m²)
- Power/mass: hp/lb (W/kg)
- Endurance: 3.75 hours
- Climb to 10,000 ft (3,050 m): 17 min
- Related development
- Aircraft of comparable role, configuration and era
- Department of computer science, University of Western Ontario. "Gloster Grouse". Retrieved 2008-09-03.
- Taylor, Michael J.H.; Bill Gunston (1980). Jane's Encyclopedia of Aviation. 1. Grolier Educational Corporation. p. 583.
- James 1971, p.89.
- Henriksson, Lars (2008-01-04). "Gloster Grouse (1926–1929)". www.avrosys.nu. Retrieved 2008-09-03.
- Jackson 1973, p.335.
- James 1971, pp. 90–91.
- James 1971, p.72.
- James 1971, p. 93.
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