Composite plank support for stringer panel

An aircraft comprising:

• one or more composite panels, each comprising:
• a skin member comprising an inner surface that is at least partially exposed;
• a plank disposed on the inner surface of the skin member and comprising a first side and a second side,
• wherein the plank comprises a set of layered laminate plies sized to form a geometric profile for each of the first side and the second side, and wherein each laminate ply of the set of layered laminate plies is arranged to extend from the first side to the second side;
• and
• a stringer comprising a cap portion, a first base segment, a first flange portion, a second base segment, and a second flange portion, wherein:
• the cap portion spans from the first side of the plank to the second side of the plank protruding away from the plank and forming a cavity between the cap portion and the plank,
• the first flange portion and the second flange portion extend from the cap portion in opposite directions and are disposed on the inner surface of the skin,
• the first base segment joins the first flange portion and the cap portion and conforms to the geometric profile of the first side of the plank, and
• the second base segment joins the second flange portion and the cap portion and conforms to the geometric profile of the second side of the plank.