Textbook in PDF format This book analyzes the performance of solar electric, water, and air-based engines. These technologies can be combined to create the revolutionary tribrid engine that combines the three technologies to create an environmentally friendly automobile. Electric motors are known for their low emissions, and solar has the potential to amplify this ability. Water powered engines react with oxygen in the air to create fuel, causing fewer emissions and improved fuel economy. Compressed-air motors are pressure-driven, diminishing our reliance on fossil fuels. Their combined potential in the tribrid model presents revolutionary innovations for how we power automobiles. This volume provides an in-depth exploration of these technologies, providing an advanced understanding of their fundamentals and potential for combination in a tribrid model, making it essential for innovators in the automotive sector