[As discussed in a previous chapter] the leading edge of the flat plate requires the wind to make an abrupt turn around it. Aft of the separation bubble, this abrupt turn causes the wind to change direction severely, which raises the likelihood that the boundary layer will separate from the foil. Correct camber provides a gentler turn. This, incidentally, is a benefit of the curved airplane wing: to provide a gentler introduction of the wing to the flow, which helps to keep the flow attached to the foil. This is also an advantage of a wing on a sailboat, as we first saw on the Australian C-class catamaran Miss Nylex in 1971, if not before. Contrary to the old lore, it is not curved to provide a “longer distance” for air molecules on the upper surface to travel.