Provided in this text, for both the student and the exercising helicopter aerodynamicist, is the info necessary to examine the performance of an existing helicopter or to take part in the design of a brand-new helicopter. This info consists of the derivation of the concept behind the numerous methods of analysis, suitable experimental data to associate and supplement the concept, and charts that allow quick analysis. A special effort is made to relate helicopter aerodynamics to airplane aerodynamics for those who are making the shift. The first 6 chapters are committed to the numerous aspects of helicopter performance. Chapters 7, 8, and 9 cover stability and control. The final chapter introduces the tradeoff factors to consider that the engineer should face during the preliminary design phase to ensure both excellent performance and excellent flying qualities. In Appendix A, an "Example Helicopter" is specified and is consistently utilized throughout the book to show!, by numerical computations, the application of the analysis.