(Answered): 2. NACA 2412 airfoil has a zero lift angle of -2.1 degree and a lift curve slope of 2 tt (if the al ...

2. NACA 2412 airfoil has a zero lift angle of -2.1 degree and a lift curve slope of 2 tt (if the alpha is expressed in radians). The pitching moment coefficient at the quarter chord is - 0.036. Compute the lift and pitching moment at quarter chord at a 4 degree angle of attack if the freestream velocity is 50 feet sec, and the chord is 2 feet. Assume sea level conditions. (ans: 3.8 lb per foot of span, -0.428 ft.lb per foot of span)