One of the few surviving aircraft from wartime Austro-Hungarian aircraft production is the Knoller C II, manufactured in 1917 by Jacob Lohner & Co., Vienna-Floridsdorf.

The Knoller C II is a two-seat, single-engine wooden biplane, powered by a liquid-cooled, six-cylinder Austro-Daimler engine. The aircraft was constructed to fill a variety of military tasks, starting with observation, through aerial photography and even bombing. The flight crew consisted of a pilot and observer; the aircraft's armament comprised two Schwarzlose machine-guns and a bomb rack for three aerial bombs, incorporated into the fuselage.

The aircraft designer was Professor Richard Knoller.

The Knoller C II began production in 1916 at three Austrian companies: Österreich-Ungarische Flugzeugfabrik Aviatik, Wiener Karosserie und Flugzeugfabrik and the Viennese factory of Jacob Lohner , where this surviving example was built.

However, the Knoller C II was a badly designed airplane. During a flight test of one manufactured aircraft on February 10th, 1917, the machine's wings collapsed and it crashed, killing its crew. On the basis of this crash, production was halted, although several tens of machines had already been built. None of the completed machines was delivered to the military; most of them ended up as static training aids for ground personnel.

The Knoller C II in the National Technical Museum is the only surviving example of this aircraft.

Technical parameters:
Motor: liquid-cooled Austro-Daimler six-cylinder, 118 kW (160 horsepower).
Wingspan: 10.2 meters
Length: 8.5 meters
Empty weight: 571 kg