| 词条 | Darmstadt D-22 | ||||||||||||||||
| 释义 |
The Darmstadt D-22 was a sportsplane of Germany, designed and built by Akaflieg of Darmstadt University of Technology. Design and developmentThe plane was designed by F. Fecher in the Akaflieg (academic group of flyers) of Darmstadt University of Technology. It was a development of Darmstadt D-18, slightly enlarged, more streamlined and fitted with an inline engine. Thanks to strengthening it was better fit to aerobatics. Two were built in 1931. Just like D-18, the plane had quite unorthodox layout, being a cantilever biplane, with an upper wing placed low above a fuselage and ahead of a lower wing. A stress was put upon aerodynamics and lightness and the plane was small, with a streamlined silhouette. Operational historyOne plane, in D-22a variant, took part in the Challenge 1932 international tourist plane contest, piloted by Walter Marienfeld. It was handicapped in technical trials, especially short landing trial, not having wing mechanization, and took the 35th place after this part (for 43 aircraft). It improved its score after a rally around Europe, where it took the 4th place, with a cruise speed 205 km/h. In a maximum speed trial it was beaten only by five Heinkel He 64s, reaching 230.7 km/h. As a result, it completed the contest on the 17th place. This plane carried registration D-2222, from 1933: D-EQIN. It was used several years after the Challenge. SpecificationsDescriptionWooden construction cantilever biplane. Fuselage oval in cross-section, plywood covered. Single-spar wings, plywood and canvas covered. Wings were dismounting and folding rearwards. Two open crew cockpits in tandem, with windshields. Fixed landing gear with a rear skid. Inline engine in a fuselage nose, two-blade propeller. Fuel tank 100 l in the fuselage. {{aircraft specifications|plane or copter?=plane |jet or prop?=prop |crew=1 |capacity=1 passenger |length main=6.6 m |length alt= |span main=7.40 m |span alt= |height main=2.4 m |height alt= |area main=13 m² |area alt= |empty weight main=345 kg |empty weight alt= |loaded weight main=600 kg |loaded weight alt= |useful load main= 255 kg |useful load alt= |max takeoff weight main= |max takeoff weight alt= |engine (prop)=Argus As 8 |number of props=1 |type of prop=air-cooled 4-cylinder inverted inline engine |power main=103 hp |power alt=75.7 kW |max speed main=230 km/h |max speed alt= |cruise speed main=200 km/h |cruise speed alt= |stall speed main=<81.8 km/h |stall speed alt= |range main= 800 km |range alt= |ceiling main=6,200 m |ceiling alt= |climb rate main= |climb rate alt= |loading main= |loading alt= |power/mass main= |power/mass alt= }} References{{Commons category}}
External links
5 : German sport aircraft 1930–1939|Akaflieg Darmstadt aircraft|Single-engined tractor aircraft|Biplanes|Aircraft first flown in 1931 |
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