The Knoller C.II was a reconnaissance aircraft built in Austria-Hungary during World War I for use by the Austro-Hungarian army.
The C.II was a conventional biplane design with staggered wings, and seated the pilot and observer in tandem in an open cockpit. Like Knoller's preceding C.I design, the upper wing was swept back, but not as far as it had been on the earlier aircraft. The structure was wooden throughout, with the wings skinned in fabric and the fuselage in plywood. The interplane struts were made of steel and arranged in a warren truss configuration.
Initial production was undertaken in three batches of 24 aircraft, one each by Aviatik, Lohner, and WKF, with the first machine delivered to the Army in September 1916. On 10 February the following year, the wings of this aircraft collapsed in flight and its crew was killed in the ensuing crash, leading to production and further flying of the type to be suspended. A single example is preserved at the National Technical Museum in Prague.
Relatively few Knoller C.II aircraft were issued to front-line units, with almost unanimous criticism of the strength, build quality and flying characteristics. Although all the contracted aircraft were built, many were stored un-assembled, due to the advent of other types with superior performance and flying qualities.
Flik 66/D (81.01, 81.02 and 81.04)[2]
Flik 67/D (81.03 and 81.05)[2]
Flek 1, 5, 8, and 18 (series 81)[2]
Airmail flight at Aspern (81.11 and 81.23 with 4 hour fuel tank)
Flik 70 (36.08, 36.10, 36.11, 36.14 and 36.20)
Flek 5 (series 36)
Flik 50[1]
Flieger-Versuchsabteilung Stryj[1]
Hungarian 5th Air Squadron (9x series 119)[1]
Hungary