A method is presented for estimating the control forces of spring-tab ailerons from nonlinear wind-tunnel data. The method applies to the most general form of spring-tab system, the geared spring tab. The two principal arrangements of the ailerons and spring unit are' considered. These arrangements are (l) an arrangement wherein the ailerons are interconnected and employ a central spring unit and (2) an arrangement with no interconnection between the ailerons with individual preloaded spring units for each aileron. Static wind-tunnel data consisting of both aileron and tab hinge-moment coefficients arc required as well as the characteristics of the 1ikage system.
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