A brief discussion of the limitations of the piston theory is given. Using Lighthill's approach, the aerodynamic forces on oscillating airfoils are derived in a slightly different form to conform to the NACA practice and the familiar nondimensional flutter coefficients are tabulated for general double and single wedge and parabolic biconvex profiles. Extensive parametric studies are included for preliminary design to aid in estimating the effect on flutter speed and frequency of airfoil thickness and profile, initial angle of attack, modal shape, changes in elastic and inertial properties of the wing, and altitude of flight.