skin design, also known as sandwich or double hull.

The first aircraft from the early 1900s were constructed with full frames consisting of wood or steel tube frame members, covered with varnished fabric or plywood, although some companies began developing monocoque structures which were built by bending and laminating thin layers of tulipwood. Oswald Short patented an all-metal, stressed-skin wing in the early 1920s. Dr.-Ing Adolf Rohrbach