Double-cloth sailwing supported by trailing edge cable with lift an drag coefficients right.
From A Comparison of the Aerodynamic Characteristics of Eight Sailwing Airfoil Sections by M. Maughmer (1979):
- The Princeton sailwing, which has been under development since 1948, is a unique, semiflexible wing intended to provide the practical ultimate in a light-weight, low-cost lifting surface suitable for a number of low- speed applications.
- Basically, the structural configuration of the sailwing consists of a leading-edge spar with attached ribs which ideally form a rigid framework supporting a trailing-edge cable in tension.
- A non-porous, non-stretchable cloth membrane, usually dacron, is then wrapped around the leading-edge and attached to the trailing-edge forming the upper and lower sail surfaces....it has been found that the aerodynamic efficiency of the sailwing can indeed approach that of a hard wing.