I bought this book in an effort to understand more about rc helis, and it is a good book, made for the beginner. It is easy to understand and is written in plain english and not in heli speak. I bought a rc heli in an effort to aid with my poor eye co ordination (since I was told medically I would never be able to fly) and it is something I have wanted to do for years. The book discusses many points of rc helicopters, including coaxials, mechanics, servos, gyros, different radios, batteries, linkages, and learning to fly. As the title says, the book concerns itself with electric helis, not nitros.
I found it a very good read