Aero elastic Wing Flutter LCO as a Hopf Bifurcation Point for a Nonlinear Convolution/Evolution Equation in a Hilb ert Space A. V. Balakrishnan UCLA Department of Electrical Engineering, Los Angeles CA 90095-1594, U.S.A. e-mail: bal@ee.ucla.edu Flutter is an endemic instability of all aircraft that occurs at highenough speed at any altitude. We show how it can be modelled as a Hopf bifurcation point for a nonlinear convolution/evolution equation in a Hilbert space.