The document discusses the optimum design of various truss configurations including fan, queen, and Pratt trusses. The author formulates the design of these trusses as an optimization problem to minimize weight. The problem considers stress, buckling, and deflection constraints with cross-sectional area as the design variable. A sequential linear programming technique is used to solve the optimization problem. Parametric studies are performed to understand the effect of truss geometry including span, purlin spacing, truss spacing, and height on selecting the best design. The results of optimizing double fan, triple fan, modified queen, double Pratt, and triple Pratt trusses are presented and discussed.