Pulse-jets are a type of jet engine that operates by using a series of combustion pulses to generate thrust. There are several synonyms for pulse-jets, including pulse detonation engines, detonation engines, pulse jets, and pulse ramjet engines. These engines are commonly used in unmanned aerial vehicles, rockets, and propulsion systems for military aircraft. The benefits of pulse-jets include their simplicity, low cost, and high power-to-weight ratio. However, they are also relatively inefficient and produce high levels of noise and vibration. Despite these limitations, pulse-jets remain a popular choice for certain applications due to their unique characteristics and capabilities.