The Heinkel HE 18 was a sports aircraft built in

Germany Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated betwe ...

in the mid 1920s. It was a two-seat conventional low-wing

monoplane A monoplane is a fixed-wing aircraft configuration with a single mainplane, in contrast to a biplane or other types of multiplanes, which have multiple planes. A monoplane has inherently the highest efficiency and lowest drag of any wing confi ...

. A development of the HE 3, it had a narrower

fuselage The fuselage (; from the French ''fuselé'' "spindle-shaped") is an aircraft's main body section. It holds crew, passengers, or cargo. In single-engine aircraft, it will usually contain an engine as well, although in some amphibious aircraft t ...

than the HE3, having tandem seating instead of side-by-side. Also, its wings were braced by a pair of

strut A strut is a structural component commonly found in engineering, aeronautics, architecture and anatomy. Struts generally work by resisting longitudinal compression, but they may also serve in tension. Human anatomy Part of the functionality o ...

s on each side, arranged in a V-shape with a single attachment point on each side of the upper fuselage, where the HE 3 had

cantilever A cantilever is a rigid structural element that extends horizontally and is supported at only one end. Typically it extends from a flat vertical surface such as a wall, to which it must be firmly attached. Like other structural elements, a canti ...

wings. The wings could be folded flat along the sides of the fuselage for transport or storage, and a choice of wheeled or float

undercarriage Undercarriage is the part of a moving vehicle that is underneath the main body of the vehicle. The term originally applied to this part of a horse-drawn carriage, and usage has since broadened to include: *The landing gear of an aircraft. *The ch ...

was available. A roll-bar was available that could be fitted in order to protect the occupants in case of a roll-over on the ground.

Specifications (HE 18)

References

* * {{Heinkel aircraft 1920s German sport aircraft HE 018 Low-wing aircraft Single-engined tractor aircraft Aircraft first flown in 1925