|Designer||Dr. Edmund Rumpler|
The Rumpler C.IX was a German single-engine, two-seat reconnaissance biplane of World War I.
At the end of 1916, the Rumpler design bureau, led by Edmund Rumpler, conceived the two-seat reconnaissance 7C 1 alongside the single seat 7D 1 fighter (which became the Rumpler D.I) Rumpler's 7C 1 design was given the designation C.IX by the Idflieg. The Rumpler C.IX had single I-type interplane struts and a smooth oval multi-stringered fuselage.
The first C.IX began testing in the spring of 1917. As a result of flight tests, a constructive flaw in the vertical rudder was revealed. After completion, the second version of the aircraft was successfully tested and a contract was signed for the production of a small series of 20 aircraft (with numbers 1501/17 -1520/17).
Data from 
- Crew: 2, pilot and observer
- Length: 6. 20 ()
- Wingspan: 8. 20 ()
- Height: ()
- Powerplant: 1 × Mercedes D.III water-cooled in-line, (160 hp)
- Wing loading: kg/m² (lb/ft²)
- Gray, Peter and Thetford, Owen. German Aircraft of the First World War. London, Putnam, 1962.
- Munson, Kenneth. Aircraft of World War I. London: Ian Allan, 1967. ISBN 0-7110-0356-4.
- Munson, Kenneth. Bombers, Patrol and Reconnaissance Aircraft 1914 - 1919. ISBN 0-7537-0918-X
- Munson, Kenneth. Fighters, Attack and Training Aircraft 1914 - 1919. ISBN 0-7537-0916-3.
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