The fourth edition ofAerodynamics for Engineershas been written to reflect the rapid advances in software and in hardware that have resulted in the ever increasing use of Computational Fluid Dynamics (CFD) in the design of aerospace vehicles. The increased reliance on computational methods has led to two changes unique to the fourth edition. Some very sophisticated numerical solutions for high-alpha flow fields (Chapter 7), transonic flows around an NACA airfoil (Chapter 9), and flow over the SR-71 at three high-speed Mach numbers (Chapter 11) appear for the first time inAerodynamics for Engineers.Although these results have appeared in the open literature, the high-quality figures were provided by Cobalt Solutions, LLC, using the post-processing packages Fieldview and EnSight. Chapter 14 has been completely rewritten to provide a discussion of the complementary use of experiment and of computation as tools for defining the aerodynamic environment. This was the greatest single change to the text. Chapter 14 was a major effort, intended to put in perspective the strengths and limitations of the various tools that were discussed individually throughout the text.John J. Bertin is the author of 'Aerodynamics for Engineers (4th Edition)', published 2001 under ISBN 9780130646330 and ISBN 0130646334.