Velocity potential equation Prandtl-Glauet Compressibilty correction Linearized velocity potential equation Improved compressibilty Correction Critical mach number The area rule for transonic flow F gure 11 Supercritical airfoils Road Map for Chap 1Velocity potential equation Linearized velocity potential equation Prandtl-Glauet Compressibilty correction Improved compressibilty Correction Critical Mach number The area rule for transonic flow Supercritical airfoils Figure 11.1 Road Map for Chap.11