Daimler L21
| Daimler L21 | |
|---|---|
 The winner's L21 in the lowest performance class of the 1925 German flight |
|
| Type: | Sport plane |
| Design country: | |
| Manufacturer: | |
| First flight: |
1925 |
| Number of pieces: |
2 |
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The Daimler L21 or Daimler-Klemm L21 was a light twin-engine, single-seat high- wing sports aircraft that was built in Germany .
development
Hanns Klemm designed the L21 for the " German round flight 1925 for the BZ price of the air ". Since initially only aircraft with an engine output of 40 hp were approved for this, but only the Daimler F 7502 drive with 20 hp was available to him, he designed the L21 made of wood with two engines. Daimler provided him with two pairs of aircraft engines with propellers rotating in opposite directions . Two copies were built D–622and D–623registered as and . In the meantime, three performance classes had been set up for the participating aircraft and aircraft under 40 hp had been approved. The L21 started in group A up to 40 hp. The winner was Bruno Loerzer with the D–623. Daimler received the Richthofen Prize for the best German engine.
Technical specifications
| Parameter | Data |
|---|---|
| crew | 2 |
| length | 5.40 m |
| span | 10.80 m |
| Wing area | 13.1 m² |
| Empty mass | 365 kg |
| Takeoff mass | 475 kg |
| Engine | 2 × air-cooled two-cylinder boxer engine Mercedes F 7502 with reduction gear and two-blade wooden propeller (Ø 1.85 m) |
| Starting power continuous power |
20 PS (15 kW) each at 3000 rpm, 18 PS (13 kW) at 2800 rpm |
| Top speed | 130 km / h |
| Cruising speed | 110 km / h |
| Landing speed | approx. 80 km / h |
| Summit height | 3500 m |
| Rise time | 10 min at 1000 m altitude |
Web links
Individual evidence
- ↑ Bruno Lange: Type manual of German aviation technology. In: German aviation. , Bernard & Graefe, Koblenz 1986, ISBN 3-7637-5284-6 , p. 202.
- ^ Karl Ries: Research on the German aircraft role. Part 1: 1919-1934. , Dieter Hoffmann, Mainz 1977, p. 51.
- ↑ Lange, p. 372