👉 A repeller is a device used in aircraft, spacecraft and other vehicles to generate or dissipate electrical energy. Repellents are used to reduce noise levels by blocking the transmission of sound waves from one object to another. They can be found on many different types of aircraft, such as propellers, thrusters, and engines. In aviation, repellers are particularly important for reducing noise pollution in airports, where they help to keep aircraft running smoothly and efficiently. They also serve as a safety feature
