Théorie élémentaire de l'hélicoptère is an introductory technical study of helicopter principles, written in French, explaining the physical and mechanical foundations needed to understand rotorcraft flight. The book focuses on the elementary theory behind lift, rotor behavior, control, and stability, making it suitable for readers seeking a concise overview of how helicopters generate and manage flight forces. Its compact format suggests a practical educational purpose rather than an exhaustive engineering reference, while its hardcover publication indicates a formal technical work intended for study or professional consultation. It is best approached as a foundational text for aviation students and technical readers interested in the mechanics of rotorcraft.