Graphene structure. One-atom-thick sheets of carbon known as graphene are promising materials in nanotechnology for applications ranging from electronics to medicine. (Credit: Bumbasor/iStockphoto/Getty Images)
Typical variation of lift coefficient (CL), drag coefficient (CD), and lift-to-drag ratio (L/D) for an airfoil as functions of angle of attack (α). Insets show physical nature of the flow field over the wing at the indicated points on the lift curve.