Stringer for an aircraft wing and a method of reinforcing thereof

A stringer for an aircraft wing, said stringer comprising:

• a first and second flanges each with an inner edge facing said other inner edge, said flanges being spaced apart in an attachment plane for attachment to a wing cover panel;
• a first planar panel having a first edge integral with said first flange and an opposite second edge, said first planar panel extending away from said first flange in a plane substantially perpendicular to said first flange and attachment plane;
• and
• a second planar panel having a first edge integral with said inner edge of said second flange and an opposite second edge, said second planar panel member extending away from said second flange at an obtuse angle and in a plane convergent with said plane of said first planar panel, said second edge of said second planar panel being integral with said first panel at a position between said first and second edges of said first planar panel.