German single-engine two-seat reconnaissance biplane
The Rumpler C.IX was a German single-engine, two-seat reconnaissance biplane of World War I.
Development.
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).
Specifications (C.IX).
"Data from" General characteristics* Crew: 2* Aspect ratio: * Propellers: 2-bladed fixed-pitch wooden propeller
Performance* Endurance: * g limits: * Roll rate: * Thrust/weight: 
Armament
* 1 × fixed, forward-firing 7.92 mm (.312 in) LMG 08/15 with an interruptor gear
*1 × 7.92 mm (.312 in) Parabellum MG14 machine gun on a ring mounting
References.
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