The Kuznetsov NK-4 is a turbojet engine developed by the Kuznetsov Design Bureau in the Soviet Union. It was designed for use in various aircraft, providing reliable thrust and performance. The NK-4 is known for its innovative engineering and was part of the evolution of jet propulsion technology during the mid-20th century. This engine was primarily used in military aircraft, contributing to the capabilities of the Soviet Air Force. Its design reflects the advancements in aerodynamics and materials science of the time, making it a significant component in the history of aviation technology.