This volume is an excellent introduction to the aerodynamics of helicopters. It provides an account of the first principles in the fluid mechanics and flight dynamics of single-rotor helicopters. The text is intended to provide, in a short volume, an introduction to the theory of rotary-wing aircraft for use by undergraduate and graduate students, while providing a detailed description of the physical phenomena involved. The text assumes that the reader already has some knowledge of differences between the fixed- and rotary-wing aircraft. Many diagrams, drawings, graphs, and representative sets of data augment the text.