Assume following data:

S$=3$ m$^2,$ c$=0\mathrm{.}5$ m$,$ sea level and V $=80$ m$/$s$.$

At zero lift M$\_$cg$=-10($Nm$).$

At other angle of attack L$=4000($N$)$ and M$\_$cg$=30($Nm$).$

Calculate the value of the moment coefficient about the aerodynamic centre and the location of the aerodynamic centre $($in $\%$ and meters$).$ Illustrate location of aerodynamic centre $($draw little diagram$).$

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