Gnom 0.4 HP

Two-stroke, air cooled 45 cc auxilliary engine for bicycles, built in Wroclaw (Poland) in 50's. There were two versions: 0.4 HP (manufactured from 1955) and 0.6 HP (available from 1958) . The engine was driving the front tyre through a gum roller. It was relatively cheap and fuel efficient (1.5 l/100km). It weighted 9 kg. The maximum speed was 27 km/h. The engine was also used in boats and motorized kayaks.