Preface to the 2025 Edition

The continuing success of this ebook during 2024 remains significant. Access statistics for 2024 show that there were 356,537 unique visitors to the ebook (up by 226% over 2024) and over 667,000 unique page views (up by  117%). Over the last year, there was an average of 800 chapter views per hour, with over 6,000 chapter views per hour at peak times. If this is not a success, I am not sure what is.

This 2025 release of the ebook has seen another round of typographical fixes and other corrections. It also includes numerous updates and some reformatting, including revised and new figures. A few chapters have been better organized regarding content and ordering, which should help both students and instructors. The ebook’s additions for the 2025 edition include chapters on potential flows, airfoil and wing theory, non-steady flows, and viscous flows. Keep your suggestions for new content coming!

Much success and best wishes in your future studies!

J. Gordon Leishman
Distinguished Professor of Aerospace Engineering, ERAU, Daytona Beach, FL.
Professor Emeritus of Aerospace Engineering, University of Maryland, College Park, MD.

Contact the author via email at Leishman_ebook@erau.edu.