Heinkel HE 18

The Heinkel HE 18 was a two-seat sports aircraft built in Germany in the mid 1920s, a conventional low-wing monoplane. It was a development of the HE 3 with a narrower fuselage and tandem rather than side-by-side seating. Its wings were braced by a pair of V-shaped struts on each side, joined to the upper fuselage at a single point, where the HE 3 had cantilever wings. The wings could be folded flat along the sides of the fuselage for transport or storage, and either a wheeled or a float undercarriage was available. A roll-bar could be fitted to protect the occupants if the aircraft overturned on the ground. A 57 kilowatt Siemens engine gave a maximum speed of 150 kilometres per hour on a wingspan of 11.1 metres.