Book excerpt: "The frenzy of technological invention and improvement that accompanied each large-scale conflict during the twentieth century has been one of the most important factors in driving the spectacular scientific advances made during the last hundred years. The half-way point of the century saw the horrors of the first truly global battle--World War II. At that time the piston aero engine was at its zenith and the world's airforces were almost entirely propeller driven. It is a period that provides the most interesting study of these engines and the aircraft they powered because the rapid change to turbojets that occurred in the post-war era saw the demise of the piston engine on almost all types of military aircraft and large airliners. This book looks at the design and development of the most famous engines used by the combatants during this great air war. Each type is studied and evaluated in historical perspective and many famous aircraft are illustrated to demonstrate installation and differing usage. One Merlin makes a Spitfire, two a Mosquito, and four a Lancaster. Engines made in America, Russia, and Germany could boast the same versatility and are described here in detail." --Book jacket.