Principles of Helicopter Flight by Mr WJ Wagtendonk
"Explains the complexities of helicopter flight in clear, easy to understand terms. Technical knowledge and sound handling drills are the ingredients of this book.It examines the aerodynamic factors associated with rotor stalls, mast bumping, wind effect and many other aspects which pilots must know. B&W, Softback, 276 pages"
Cyclic & Collective by S Coyle
"This book is the second book in the series and includes; detailed description of piston engines for helicopters. Turbine engine operation. Twin engine helicopter operations including Cat A.This easy to understand overview of the theory and practice of helicopters, covers nearly all aspects of learning to fly a helicopter from basic theory through to advanced autopilots. An overview of most of the helicopter rotor systems and how they work. Detailed overview of flight manuals and legal aspects of flying. The book also contains advanced section for professional pilots, as well as those who want to know more about helicopters and how they work. 458 pages, B&W, Softback"