1. When one reviews the history o f aeroelastic studies, the progression i n the sophistication o f theoretical models i s readily apparent. Also apparent i s the re 1iance upon experience gained from simple models to explain and t o understand, i n a qualitative fashion, the results and trends present i n wind tunnel tests and i n sophisticated mathematical analysis. The workhorse o f a l l simplistic math models is, o f course, the 2-dimensional, "typical section" (see, for instance, Ref. 6). This model traces i t s origins t o the 1930's; it i s s t i l l used extensive 1y, both i n educational pursuits and i n serious, sophisticated research efforts such as the study of transonic aeroelasticity. The advantages o f such a model are twofold. Algebraic expressions for the equations o f motion o f such a system reveal a great deal about inertial and aerodynamic interaction. For certain assumptions or restrictions, closed-form solutions for flutter and divergence speeds may be found. Equally important i s the extensive experience that enables one to t e l l when the 2-D results are likely to be valid and when they are not.