KAI KF-21 Boramae

KAI KF-21 Boramae is a twin-engine, multirole fighter aircraft classified as a 4.5-generation platform, jointly developed by Türkiye and Indonesia. "Boramae" means "falcon" in Korean, a name symbolizing the aircraft’s agility and air-to-air combat capabilities. Designed for the Republic of Korea Air Force (ROKAF) and the Indonesian National Armed Forces Air Force (TNI-AU), the KF-21 is capable of performing both air-to-air and air-to-ground missions with high effectiveness. The KF-21 project represents South Korea’s second domestically developed fighter jet program, following the FA-50 Golden Eagle, a light attack and trainer aircraft. This initiative aims to enhance South Korea’s technological independence in its defense industry, demonstrate advanced fighter aircraft development capabilities, and modernize its air forces.

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The KF-21 project emerged from the need for a technologically superior platform to replace aging fighter aircraft such as the F-4 Phantom II and F-5 Freedom Fighter, which had served South Korea for decades but no longer met the demands of modern combat environments. The primary contractor is Korea Aerospace Industries (KAI), South Korea’s leading aerospace and defense company, while Indonesia joined as a key partner to share development costs and secure technology transfer. The project is also known as the "Korean Fighter eXperimental" (KF-X).

The development of the KF-21 is planned in two main phases:

• Block 1: This initial phase features a baseline configuration focused primarily on air superiority missions. Block 1 aircraft are equipped with air-to-air missile systems and advanced radar capabilities. During this phase, the aircraft’s core flight performance, avionics systems, and basic weapons integration were tested and matured.
• Block 2: The second phase significantly enhances the aircraft’s multirole capabilities. KF-21s in Block 2 configuration will gain the ability to carry air-to-ground guided munitions, cruise missiles, and other precision strike systems. This phase integrates systems enabling effective employment in both air-to-air and air-to-ground missions.

Future development phases may include the integration of internal weapons bays to reduce the aircraft’s radar cross-section (RCS) and enhance its stealth characteristics.

• Crew: Single-seat (KF-21 Block 1) or twin-seat (KF-21 Block 2 and other variants)
• Length: Approximately 16.9 meters (55.4 feet)
• Wingspan: Approximately 11.2 meters (36.7 feet)
• Height: Approximately 4.7 meters (15.4 feet)
• Engines: 2 × General Electric F414-GE-400K turbofan engines
• Maximum Speed: Mach 1.81 (approximately 1,996 km/h)
• Maximum Takeoff Weight: Approximately 25,400 kg (56,000 lb)
• Weapons Load: Approximately 7,700 kg (17,000 lb)
• Air-to-Air Missiles: MBDA Meteor, AIM-9X Sidewinder, and others
• Air-to-Ground Weapons: Various guided and unguided bombs, anti-radar missiles such as the AGM-88 HARM, and cruise missiles

South Korea aims to receive at least 40 KF-21 Block 1 aircraft by 2028 as part of its air force modernization program, and to increase this number to a total of 120 by 2032. With Indonesia’s participation as a partner, it is expected that Indonesia will also procure a specified number of KF-21s.

Under the KF-21 project, various variants are planned to meet different operational requirements. The currently known primary variants include:

• KF-21 Block 1: The baseline single-seat model optimized primarily for air superiority missions.
• KF-21 Block 2: A twin-seat variant with enhanced air-to-ground strike capabilities. This model will feature a broader weapons payload and a crew configuration capable of managing complex missions.
• Naval Variant: A naval variant capable of operating from aircraft carriers is also a potential future development.