The engines powering aircraft come in many shapes and sizes, but all will usually be one of two types: a piston or gas turbine engine (jet engine). The piston engine has been powering aircraft since the Wright brothers took to the air over a hundred years ago, whereas gas turbine engines produce a massive amount of thrust to haul large and heavy aircraft into the sky. Piston and gas turbine engines are the primary focus of this book, but we will also see how electricity or hydrogen could power aircraft in the future. From the author of the hugely popular Aviation Books Series , this book takes the reader deep into the world of aircraft engines, with a particular focus on practical aviation, thereby linking science with the real world. Whether you are a new pilot who is exploring the topic in greater detail or a professional pilot who has been flying for countless years, it is essential to have a comprehensive understanding of the engine powering your aircraft.