The Wulung UAV has been carefully engineered to facilitate various surveillance and reconnaissance missions in Indonesian airspace. Flight endurance emerged as an important determinant of the UAV's overall performance. This research utilizes OpenVSP software, an open-source tool for aerodynamic simulation, to assess the design of the Wulung UAV. The research involves developing a UAV model featuring various taper ratio and sweep angle configurations using OpenVSP. Furthermore, aerodynamic simulations were conducted to ascertain the flight duration corresponding to each configuration. The analysis results show that the combination of a reduced taper ratio and an increased sweep angle with a value constraint can increase the flight duration of the Wulung UAV due to an increase in the lift-to-drag ratio. OpenVSP has demonstrated its performance as an instrument for preliminary analysis of the impact of wing design on UAV performance, and the results of this study can provide a basic foundation for optimizing the design of the Wulung UAV to achieve superior flight endurance.