Albatros L 69
| Albatros L 69 | |
|---|---|
|
|
| Type: | Sports and school - fighter |
| Design country: | |
| Manufacturer: | |
| First flight: |
1925 |
| Number of pieces: |
4th |
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The Albatros L 69 was a German sports aircraft that was developed and built by the Albatros Flugzeugwerke in Berlin-Johannisthal in the mid-1920s.
history
The L 69 was designed in 1925 by the head of the Albatros development department, Rudolf Schubert, for participation in the German sightseeing flight , which took place from May 31 to June 9, for the BZ Prize of the Air . For the competition, two aircraft were built with different drives: the D–679, work number 10042, with a Sh-12 - radial engine and D–684of unknown work number and a Lucifer same -Triebwerk design. They started in class C, which was intended for the most powerful aircraft from 81 to 120 hp, but did not make it into the top three places. Participation in the Saxony sightseeing flight on September 19 and 20, 1925, which one of the L 69s was the first winner in class D, was more successful. Subsequently, both aircraft were taken to the Soviet Union, where they were part of the permanent inventory of the Lipetsk Aviation School operated by the Reichswehr and were used as fighter trainers.
Two more L 69s were created with the same different drive configurations. The serial number 10071 with a Lucifer engine and the license plate D–778was approved for the German Aviation Research Institute in Berlin-Adlershof in February 1928 , but in April 1929 it was removed from the aircraft role as "dismantled". The now fourth L 69 with the work number 10072 and a Sh 12 as drive received the license plate in November 1928 D–1533and flew for the Albatros-Werke Johannisthal until January 1931, before it was cannibalized.
construction
The Albatros L 69 was an all-wood , cantilever high- wing aircraft with a fuselage consisting of a plywood-covered wooden frame with a square cross-section with rounded sides and tapering to a point at the stern. The engine mount was connected to the fuselage by four bolts and consisted of tubular steel with aluminum cladding up to the level of the fire bulkhead . Behind it were the crew cabins with two tandem seats , the rear one being intended for the pilot . The continuous wing consisted of a wooden frame with ribs and two spars as well as plywood planking and some fabric covering. The 140-liter fuel tank designed as a drop tank was also housed there. The wing was connected to the fuselage by a flat tubular steel canopy . The tail unit was also self-supporting and comprised the wooden fins covered with plywood and the oars made of tubular steel with fabric covering. The rigid main landing gear consisted of two disc wheels with split axles and tubular steel V-struts for fastening the fuselage. A spring-loaded abrasive spur was attached to the stern .
Technical specifications
| Parameter | Data |
|---|---|
| crew | 1-2 |
| span | 8.06 m |
| length | 6.10 m |
| height | 2.57 m |
| Wing area | 14.0 m² |
| V position | 0 ° |
| Wing loading | 49 kg / m² |
| Power load | 6.5 kg / hp |
| Preparation mass | 480 kg |
| Payload | 205 kg |
| Takeoff mass | 685 kg |
| Drive 1 | an air-cooled three - cylinder Bristol Lucifer radial engine . with 120 PS (88 kW) takeoff power and 125 PS (92 kW) rated power |
| Drive 2 | an air-cooled nine-cylinder star engine Siemens & Halske Sh 12 with 100 HP (74 kW) starting power and 112 HP (82 kW) nominal power |
| Fuel volume | 140 l |
| Top speed | 170 km / h |
| Landing speed | 105 km / h |
| Rise time | 2 min at 500 m altitude 4 min at 1000 m altitude |
| Summit height | 4000 m at full load |
| Flight duration | 2 h |
literature
- Peter Alles-Fernandez (Ed.): Aircraft from A to Z. Volume 1: Aamsa Quail – Consolidated P2Y. Bernard & Graefe, Koblenz 1987, ISBN 3-7637-5904-2 .
- K. Grasmann (Hrsg.): Airplane type tables. DMZ 1925-1927. 1977 (facsimile reprint Deutsche Motor-Zeitschrift, issue 14/1925).
- Helmut Stützer: The German military aircraft 1919–1934. ES Mittler & Sohn, Herford 1984, ISBN 3-8132-0184-8 .
Web links
Individual evidence
- ^ Karl Ries: Research on the German aviation role. Part 1: 1919-1934. Dieter Hoffmann, Mainz 1977, ISBN 3-87341-022-2 , p. 54.
- ↑ Bruno Lange: Type manual of German aviation. In: Die deutsche Luftfahrt, Volume 9 , Bernard & Graefe, Koblenz 1986, ISBN 3-7637-5284-6 , p. 372.
- ↑ Dieter Stammer: The cradle of the German Air Force in the Soviet Union. In: Fliegerrevue X. No. 47. PPVMedien, 2014, ISSN 2195-1233 , p. 49
- ↑ Ries, pp. 60 and 113