Check the strength of a flanged rib under maximum direct stress due to bending for: effective clamped position at z = 75 mm from the leading edge false rear spar position at z = 200 mm from the leading edge effective resultant load P = 21 N applied at z = 75 mm aft of the effective clamped position rib depth bw = 47 mm @ clamped position = rib second moment of area = 21,184 mm4 at the effective clamped position rib material ultimate direct strength o* = 28 Mpa Use thin wall approximation