A comprehensive guide dealing in detail with every imaginable aspect associated with the design, modification and construction of radio-controlled sports model aircraft powered by internal combustion or electric motors. The text helps the modeller who has built one or two kit model aircraft to progress from simple modifications to the creation of unique designs. The author deals with basic materials, essential aerodynamic considerations, the various constructional methods, the wide range of model configurations and size as well as a broad choice of power plants. The book finishes with tips on drawing plans, getting them published and safely completing the early test flights.