Raab-Katzenstein RK.9 Grasmücke
Raab-Katzenstein · Germany · first flew 1928 · light aircraft
The Raab-Katzenstein RK.9 Grasmücke (Hedge-sparrow) was a 1920s German two-seat touring, advertising and training biplane.
Recognition (WEFT)
| W — Wings | Mid-mounted, straight |
|---|---|
| E — Engines | 1 × piston, nose-mounted |
| F — Fuselage | 6.85 m fuselage |
| T — Tail | Conventional |
WEFT is AircraftIQ's four-point recognition method — how it works.
Spot it by:
- Single-bay biplane with strongly staggered unequal-span wings
- Uncowled three-cylinder radial engine on the nose
- Ailerons on the upper wing only
A small tandem two-seat biplane with a shorter lower wing, N-type interplane struts and an uncowled radial engine.
Specifications
- The Raab-Katzenstein RK.9 Grasmücke has a length of 6.85 m (22 ft).
- It has a wingspan of 8.96 m (29 ft).
- Its maximum speed is 120 km/h (75 mph).
- Typical crew: 2.
Figures are for the representative variant described above; marks differ. See how AircraftIQ sources figures.
History
It was one of many designs from several countries aimed at low-cost flying. The RK.9 had a 35 hp Anzani radial, and wings built in a glider-style D-box construction.
Variants
The RK.9a substituted a nine-cylinder 40 hp Salmson 9AD radial, which added about 10 per cent to the weight but improved the rate of climb by 15 per cent.
Where you'll see it
It was quite successful, with about twenty built.
Related aircraft
- Raab-Katzenstein RK-26 Tigerschwalbe
- Raab-Katzenstein KL.1 Schwalbe
- Albatros L 74
- Albatros L 75 Ass
- Arado SC II
- Bartel BM 5
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