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+//(Brakes) Example 12.9
+//Face width of the friction lining w (mm)
+w = 50
+//Maximum intensity of normal pressure pmax (N/mm2)
+pmax = 1
+//Coefficient of friction mu
+mu = 0.3
+//Radius of the drum R (mm)
+R = 250
+//All angles are taken from the same reference
+//Angles of the shoe theta1 and theta2
+theta1 = 15
+theta2 = 75
+//Maximum normal pressure occurs at angle fi (deg)
+if (theta2 > 90)
+    fi = 90
+else
+    fi = theta2
+end
+//Distance of the force from the horizontal centerline d1 (mm)
+d1 = 200
+//The distance of the pivot from the axis of the brake drum h (mm)
+h= 200
+//Distance of the pivot from the vertical centerline d2 (mm)
+d2 = 50