| 词条 | De Havilland Hyena | |||||||||||||||
| 释义 |
The de Havilland DH.56 Hyena was a prototype British army cooperation aircraft of the 1920s. A single-engined biplane, the Hyena was designed against an RAF requirement, but was unsuccessful with only two being built, the Armstrong Whitworth Atlas being preferred. Development and designThe DH.56 Hyena was developed to meet the requirements of Air Ministry Specification 30/24 for an Army Cooperation aircraft to equip Britain's Royal Air Force.[1] It was a development of de Havilland's earlier DH.42B Dingo, and like the Dingo, was a single-engined two-bay biplane carrying a crew of two. It was armed with a forward-firing Vickers machine gun and a Lewis gun operated by the observer. A hook to pick up messages was fitted beneath the fuselage, while the aircraft was also equipped for photography, artillery spotting, supply dropping and bombing.[1] The first Hyena flew on 17 May 1925,[1] powered by a 385 hp (287 kW) Armstrong Siddeley Jaguar III radial engine. With this engine it was underpowered, and was quickly re-engined with a 422 hp (315 kW) Jaguar IV before it was submitted for official testing (which was against the requirements of Specification 20/25, which had superseded 30/24).[1] The two prototype Hyenas were tested against the other competitors for the RAF's orders, the Armstrong Whitworth Atlas, the Bristol Bloodhound and the Vickers Vespa, including field evaluation with No. 4 Squadron RAF.[2] Handling close to the ground was found to be difficult, with a poor view from the cockpit, and the orders went to the Atlas, with the Hyena being abandoned, being used for testing at the Royal Aircraft Establishment, Farnborough until 1928.[1] Specifications (Jaguar IV){{aircraft specifications|plane or copter?=plane |jet or prop?=prop |ref=De Havilland Aircraft since 1909 [3] |crew=two |capacity= |payload main= |payload alt= |payload more= |length main= 29 ft 9 in |length alt=9.07 m |span main=43 ft 0 in |span alt=13.11 m |height main=10 ft 9 in |height alt=3.28 m |area main= 421.25 ft² |area alt= 39.1 m² |airfoil= |empty weight main= 2,399 lb |empty weight alt= 1,090 kg |loaded weight main= 4,200 lb |loaded weight alt= 1,909 kg |useful load main= |useful load alt= |max takeoff weight main= |max takeoff weight alt= |max takeoff weight more= |more general= |engine (prop)=Armstrong Siddeley Jaguar IV |type of prop=14-cylinder air-cooled radial engine |number of props=1 |power main= 422 hp |power alt=315 kW |power original= |power more= |max speed main= 130 mph |max speed alt=113 knots, 209 km/h |max speed more= |cruise speed main= |cruise speed alt= |cruise speed more |stall speed main= |stall speed alt= |stall speed more= |never exceed speed main= |never exceed speed alt= |range main= |range alt= |ferry range main= |ferry range alt= |ferry range more= |ceiling main= 19,230 ft [4] |ceiling alt= 5,860 m |climb rate main= |climb rate alt= |loading main= |loading alt= |thrust/weight= |power/mass main= |power/mass alt= |more performance=*Climb to 10,000 ft (3,050 m): 13 min 24 sec[4] |guns= 1× forward firing .303 in (7.7 mm) Vickers machine gun and 1 × .303 in (7.7 mm) Lewis Gun on Scarff ring in rear cockpit |bombs= Four light bombs under port wing |rockets= |missiles= |hardpoints= |hardpoint capacity= |avionics= }} See also{{aircontent|see also= |related=*de Havilland Dingo |similar aircraft=*Armstrong Whitworth Atlas
|lists= }} Notes1. ^Jackson 1987, p.213. 2. ^Jackson 1987, pp. 214–215. 3. ^Jackson 1994, p.215. 4. ^1 2 3 4 5 Mason 1994, p.172. References{{refbegin}}
External links{{commons category|De Havilland DH.56 Hyena}}
2 : British bomber aircraft 1920–1929|De Havilland aircraft |
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