3.9 The aerodynamic center (a.c.) of wing-fuselage is located at 0.2 mac and the center of gravity is at 0.25 mac. Using the following data, determine the horizontal tail area to give a minimum static margin of 0.08 mac. Cm,f = 0.1CL, aw 0.1/deg, a = 0.08/deg, € = 0.45α, l₁/č = 2.5, N₁ = 0.95, and S = 25 m². [Answer: 5.5 m².] ===