Abstract
Under-water glider is the glider to use for environmental researches in sea and lake. Reynolds number of flow around under-water glider is low such as between 1×10^4 and 1×10^5. Performance of wing at low Reynolds number is different from that of high Reynolds number. In this study, aerodynamic characteristics of three dimensional wings with various airfoils which have sinusoidal leading edge at low Reynolds number were investigated by the wind tunnel experiment and compared with that of normal shape. It was found that sinusoidal leading edge a=0.05c increase lift coefficient at high angle of attack and maximum lift-to-drag ratio independent of the airfoil. It was also found that decreases in drag coefficient were observed in symmetric airfoil NACA0012 and thick airfoil NACA64_3-618 with sinusoidal leading edge.
