KF-21 Boramae

South Korea’s indigenous 4.5-generation twin-engine multirole fighter—blending semi-stealth shaping, an AESA radar, and an aggressive price to replace aging ROKAF fleets and open an export lane for nations locked out of the F-35.

Overview

The KF-21 Boramae (Korean for “Fighting Hawk”) is a twin-engine supersonic multirole fighter developed by Korea Aerospace Industries (KAI) under the direction of the Agency for Defense Development (ADD) and the Defense Acquisition Program Administration (DAPA). It is the first South Korean-designed aircraft to incorporate a low-observable airframe and an indigenous active electronically scanned array (AESA) fire-control radar, making the Republic of Korea the fourth nation after the United States, China, and Russia to produce a fighter with built-in stealth-architecture avionics. The Block I variant, focused on air-to-air superiority, is now in serial production; the Block II will add air-to-ground and anti-ship capabilities, while the Block III/EX concept aims for full internal carriage and sixth-generation networked combat. The aircraft is intended to replace the ROKAF’s fleet of F-4 Phantom II and F-5 Tiger II fighters, and to win export orders from countries that cannot acquire the F-35 due to cost or political restrictions.

Development

The KF-X programme was first proposed by President Kim Dae-jung in March 2001. After a long series of feasibility studies, technology-transfer negotiations, and a contentious 2015 deal with Lockheed Martin for F-35 co-production technology—where 25 core technologies were later blocked by the United States—KAI was formally selected as prime contractor in January 2016 and signed the full-scale development contract in the same year. Indonesia joined as a development partner with a 20% stake, although that participation later shrank significantly due to missed payments. The first prototype was unveiled at KAI’s Sacheon plant in April 2021, and the maiden flight occurred on 19 July 2022, according to Wikipedia. Prototype No. 2 broke the sound barrier in January 2023. The six-aircraft test fleet logged over 2,000 sorties covering supersonic performance, weapon separation trials (Meteor, IRIS-T, AMRAAM, JDAM), and full AESA radar integration. Serial production began in July 2024, and the first production airframe—a twin-seat Block I—rolled out in March 2026, completing its first flight on 15 April 2026, as reported by Aviation Week. DAPA approved Final Combat Suitability in May 2026, clearing the path for the ROKAF’s initial operational capability planned for September 2026.

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