South Korea Unveils LOWUS Stealth Drone to Boost KF-21 Fighter Capabilities

South Korea has taken a significant step forward in its defence aviation capabilities with the unveiling of its first stealth drone, the Low Observable Unmanned Wingman System (LOWUS). This cutting-edge unmanned system is designed to work alongside the KF-21 Boramae fighter jet, improving its survivability and combat effectiveness. The prototype was officially revealed at the Korean Air Tech Centre in Busan on February 25, 2025.

Developed jointly by Korean Air and the Agency for Defence Development (ADD), with support from the Defence Acquisition Program Administration (DAPA), the LOWUS is part of South Korea’s broader strategy to incorporate drone technology into its military operations. The programme, initiated in 2021, aims to create a highly capable manned-unmanned teaming (MUM-T) system that allows drones to operate autonomously under the direction of piloted aircraft.

The design of the LOWUS prioritizes stealth and survivability. It features a trapezoidal fuselage, sharply swept wings, a V-tail, and an overhead air intake, making it aerodynamically similar to advanced drones like the U.S. XQ-58A Valkyrie and Boeing’s MQ-28 Ghost Bat. Additionally, the drone incorporates radar-absorbing materials, significantly reducing its radar cross-section and making it harder to detect in combat scenarios.

One of the most critical aspects of the LOWUS is its integration with the KF-21 fighter jet. The first operational Block 1 variant of the KF-21 is focused on air-to-air combat and lacks internal weapons bays. The LOWUS complements the fighter by handling air-to-ground missions, reconnaissance, and electronic warfare, allowing the KF-21 to stay at a safer distance while still engaging targets effectively. This coordinated approach enhances the KF-21’s combat range and survivability, giving South Korea a tactical edge in modern warfare.

Beyond the KF-21, the LOWUS has the potential to support other platforms, such as the FA-50 light combat aircraft, which could make it a valuable asset for export markets. South Korea’s push into unmanned aerial systems aligns with its broader ambitions to become a major player in the global defence aviation industry.

The first flight of the LOWUS is expected by the end of 2025, with further manned-unmanned teaming tests set to continue until 2027. As South Korea continues refining this technology, the LOWUS could play a crucial role in shaping the future of air combat for the country and its allies.