Humpback whales flipper inspired researchers to investigate aerodynamic performance, in order to understand the influence of tubercles on flippers. The overall aim of this work is to investigate the wavy leading edge phenomena in the high Reynolds number regime. Experimental investigation were carried out correlating force measurements with oil visualizations in order to understand wavy leading edge phenomena for a wing of AR = 4 with NACA 0020 airfoil profile. Four configurations were tested (A = 0.11c, ? = 0.11; A = 0.03c, ? = 0.4; A = 0.03c, ? = 0.11; smooth) at three different Reynolds number (Re = 700,000; Re = 1,500,000; Re = 3,000,000). For all tested Reynolds number, lower amplitude configurations indicate increase in lift coefficient curve slope, when compared to the smooth configuration. The lower amplitude and wavelength setup indicate enhance in maximum lift coefficient and stall angle, which is related to delay in boundary-layer separation. In addition, zero-lift drag coefficient increases. Oil visualizations reveal that modified configurations induce recirculation zones and delay flow detachment. At high angles of attack, the A3?11 configuration is shown to present spanwise wavelengths for which the optimal generation of streaks in turbulent boundary layers is expected according to previous experimental works. The appearance of such streaky boundary layers may be related to the "lift-up" effect and results the delay in flow separation and increase of maximum lift. This work indicates tubercles as important wing modification, as it showed raise maximum lift coefficient in 11.8% for Reynolds number of 700,000, 28% for Reynolds number at 1,500,000 and 28.3% for Reynolds number at 3,000,000.