The relation between lift coefficient and moment coefficient about the leading edge is_______(a) cm,le=-(\(\frac {c_l}{2}+\frac {\pi }{4}\)(A1-A2))(b) cm,le=-(\(\frac {c_l}{4}+\frac {\pi }{4}\)(A1-A2))(c) cm,le=-(\(\frac {c_l}{4}\)+(A1-A2))(d) cm,le=(\(\frac {c_l}{2}+\frac {\pi }{4}\)(A1-A2))The question was asked in semester exam.My enquiry is from The Cambered Airfoil in chapter Incompressible Flow over Airfoils of Aerodynamics

The relation between lift coefficient and moment coefficient about the

1.	The relation between lift coefficient and moment coefficient about the leading edge is_______(a) cm,le=-(\(\frac {c_l}{2}+\frac {\pi }{4}\)(A1-A2))(b) cm,le=-(\(\frac {c_l}{4}+\frac {\pi }{4}\)(A1-A2))(c) cm,le=-(\(\frac {c_l}{4}\)+(A1-A2))(d) cm,le=(\(\frac {c_l}{2}+\frac {\pi }{4}\)(A1-A2))The question was asked in semester exam.My enquiry is from The Cambered Airfoil in chapter Incompressible Flow over Airfoils of Aerodynamics
Answer» Correct choice is (B) cm,LE=-(\(\FRAC {c_l}{4}+\frac {\pi }{4}\)(A1-A2)) To explain I would say: The lift coefficient is cl=π(2A0+A1). When we put this in the formula for moment coefficient about the leading edge, cm,le=-0.5π(A0+A1-0.5A2) we GET the desired relation.

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