One approach to improve the aerodynamic performance of airfoils and hydrofoils is inject a small amount of energy to the system (such as fluid injection or suction on the surface). to change the lift and drag. In fact. surface suction and blowing of the fluid can improve the pressure distribution and velocity gradient on the airfoil/hydrofoil surfaces and modify the flow separation po... https://www.roneverhart.com/Open-Box-Apple-Watch-Series-6-GPS-Cellular-40mm-Space-Gray-Aluminum-w-Black-Sport-Band/