An aeroelastic energy harvester is investigated in this thesis. An aeroelastic energy harvester is modeled as a cantilever beam with an airfoil attached by a revolute joint to its free end. A piezoelectric patch is located toward the clamped end of the said beam. The goal is to analyze the effect of position of a point mass, located on different places on the beam, on the onset of flutter instability. Also, calculating the response of system after the flutter occurrence is done in order to have a better understanding of the amount of energy that is harvested. Mathematical models include both linear and nonlinear aeroelastic models. For flutter analysis a linear model, peters finite sate model, is used. The nonlinear part of the problem is modeled by ONERA dynamic stall model in order to include the effects of vortices and dynamic stall. Flutter onset airspeed and also system response is modeled for ten different locations for the point mass on the beam. After plotting the results, it shows that as long as the mass goes along the beam toward its free end, the onset of flutter doesn’t change much until it reaches the middle of beam. After passing the middle point of the beam, the onset speed of flutter drops down rapidly. The area under the electrical charge, shows no significant change regarding the point mass movement toward the free end until the mass reaches almost the middle of beam where it drops drastically by moving the point mass beyond the middle of the beam toward its free end thus harvesting less energy. The calculations showed the best potion for mass on the beam is 56 percent of the beam from the clamped side. It concludes, in order to have extended range of energy harvesting from airflow, a point mass is needed to be located at the free end of beam so that the flutter would happen in lower airspeed. But after the occurrence of flutter the point mass is needed to be retracted toward the clamped side and be located in the middle of the beam preferably by a drag powered device, where it can harvest the largest amount of energy. This results in more energy harvesting and wider range simultaneously. Keywords: Energy harvesting, Aeroelasticity, Airfoil, ONERA model, Peters model, Theodorson model, Dynamic stall, Piezoelectric, Flutter, Nonlinear response .