Vented hat stringers and methods of forming the same

A vented hat stringer, comprising:

• a first hat-stringer leg that comprises a first-hat-stringer-leg surface;
• a second hat-stringer leg that comprises a second-hat-stringer-leg surface, wherein the second hat-stringer leg is spaced apart from the first hat-stringer leg;
• a first hat-stringer sidewall, comprising a first-hat-stringer-sidewall surface that extends from the first-hat-stringer-leg surface, wherein the first hat-stringer sidewall is planar;
• a hat-stringer connecting wall, comprising a hat-stringer-connecting-wall surface, extending from the first-hat-stringer-leg surface, and a virtual hat-stringer-connecting-wall symmetry plane, passing through the hat-stringer-connecting-wall surface, wherein the hat-stringer connecting wall is arcuate;
• a second hat-stringer sidewall, comprising a second-hat-stringer-sidewall surface that extends from the hat-stringer-connecting-wall surface to the second-hat-stringer-leg surface;
• and
• a ventilation opening, spanning the first hat-stringer sidewall and the hat-stringer connecting wall, the ventilation opening defining a ventilation-opening centerline, wherein the ventilation-opening centerline does not coincide with the virtual hat-stringer-connecting-wall symmetry plane.