This document describes an aeropropulsion unit taught between 2005-2010 at the International School of Engineering at Chulalongkorn University. The unit introduces concepts of propulsion systems, air-breathing and non-air breathing engines, gas turbine cycles, and components. Key topics include the Brayton cycle, propellers, momentum theory, gas turbine performance, and types of engines like turbojets, turbofans and turboprops. The objectives are to understand thermodynamics and compressible flow applications to propulsion and analyze the performance of engines and components.