Mechanical Engineering Volume IV-21 Book 3 Aircraft Engines, edited by K. In. Frolova is an important and significant work in the field of aviation engineering and engineering, which will become an indispensable source of knowledge for students, engineers and anyone interested in modern technologies in aviation. This volume is a deep dive into the world of aircraft engines, covering both theoretical and practical aspects of their design, production and operation. The book discusses in detail the different types of aircraft engines, their design features and principles of operation. Readers will be able to learn about the latest achievements in the field of engine building, as well as about the trends that shape the future of the aviation industry. Frolov, as an experienced specialist and authority in his field, shares his knowledge and observations, which makes the text not only informative, but also fascinating. It uses an accessible language, which allows even those who do not have deep technical knowledge to understand basic concepts and ideas. The book will be of interest to a wide range of readers: from students of technical universities studying mechanical engineering and aviation engineering, to professionals working in the aviation industry. Engineers, designers and researchers will find useful information in it that will help them in their work. Also, this work will be useful to those who are simply fond of aviation and want to deepen their knowledge of the engines that drive airplanes and helicopters. The topics raised in the book cover a wide range of issues, from the basics of aerodynamics and thermodynamics to modern technologies such as the use of composite materials and automated control systems. Frolov focuses on the importance of sustainable development and environmental aspects, which makes the book relevant in light of the current challenges facing the aviation industry. The author's style is distinguished by clarity and logical presentation, which allows the reader to easily follow the course of thought and absorb complex technical details. K. In. Frolov is the author of many works in the field of engineering and aviation, and his experience and knowledge make this book a valuable contribution to the literature on this topic. His previous publications have also earned recognition among professionals, and this volume will not be an exception. If you are looking for information about modern aircraft engines, their design and operating principles, then “Engineering Volume IV-21 Book 3 Aviation engines” is what you need. The book will become not only a textbook, but also a reference book for everyone who wants to be aware of the latest achievements in the field of aviation technology. Do not miss the opportunity to get acquainted with this fascinating and informative work, which will open up new horizons for you in the world of aviation.