This book covers the characteristics and emerging technologies in aeronautics, e.g., UAVs (unmanned aerial vehicles) and hydrogen technologies, composite blade testing, electrical aircraft, safety risk assessment methods, etc. The book's contents can help readers better understand the new technologies applied in aeronautics and aviation safety design and analysis. Aeronautics is a dynamic field that combines traditional characteristics with cutting-edge technologies. The continuous pursuit of improved performance, safety, and sustainability drives the industry forward, opening up new possibilities for the future of flight.