The Orlogsværftet O-Maskinen was a military training/multi-purpose biplane developed by the Orlogsværftet Flying Machine Workshop in 1926.[1] Two versions were created: the two seat IO (14 produced) and single seat IIO (1 produced).
One aircraft, registration O-70, crashed on July 23, 1931 while flying in formation with five other IOs in a training flight. Both occupants were killed.[3]