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diff --git a/689/CH8/EX8.9/9.sce b/689/CH8/EX8.9/9.sce
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+clc; funcprot(0);
+//Example 8.9 Polar Curve 
+
+// Initialisation of variables
+Cl_clark = 0.43;      //Values from fig 8.18
+Cd_clark = 0.020;       //Values from fig 8.18
+Cl_USA = 0.55;        //Values from fig 8.19    
+Cd_USA = 0.03;        //Values from fig 8.19
+// Calculations
+LbyD_clark = Cl_clark/Cd_clark;
+LbyD_USA = Cl_USA/Cd_USA;
+
+//Results 
+disp(LbyD_clark,"Maximum L/D for clark Y :",LbyD_USA,"Maximum L/D for USA-35 :");