Methods and systems for controlling shocks on airfoil lower surfaces are
disclosed. An airfoil in accordance with one embodiment of the invention
includes an upper surface portion having an upper surface positioned to
face generally upwardly during the level flight, and a lower surface
portion having a leading edge region, a trailing edge region and a lower
surface positioned to face generally downwardly during level flight. A
shock control protrusion extends away from the lower surface and is
positioned to generate a shock extending away from the lower surface at a
least one flight condition.