This should be the first book on the shelf of any serious aircraft designer. The first half of the book is a review of classic airfoil theory, including all of the pertinent formulas. It is a bit dry and definitely not a textbook, but rather a comprehensive reference manual. Most people skip the text and buy the book for the second half, which is a compilation of all the basic NACA airfoils. Each airfoil shape is exactly described and includes graphs of performance data. This is a "must have" book for anyone who wants to design airfoils, whether they are the wings of an airplane, or the fins, rudders, etc. of a sailboat.