South Korea Launches Sixth-Generation Fighter Project Focused on Stealth

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Just over a month after the KF-21 rollout ceremony, the South Korean government is pressing ahead with the modernisation of its combat aircraft fleet. South Korea is now launching a sixth-generation fighter project focused on stealth, aiming to strengthen its domestic industry. The Defense Acquisition Program Administration (DAPA) has issued the first request for proposals for the platform's conceptual study. Meanwhile, the Agency for Defense Development (ADD) has disclosed the first details of the aircraft's potential design.

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South Korean media reports state that DAPA released the request for the conceptual study on 21 August. The document's main purpose is to establish the design, configuration and development timetable for the coming years. Official sources put the project's budget at approximately US$650,000. The agency has set a 14-month deadline for completing this initial stage.

Technical requirements and aerospace industry challenges

From a technical perspective, the official request sets out a demanding list of criteria. It requires designs to be submitted both with and without vertical tail stabilisers. The fighter must also feature effective stealth characteristics in the X, S and L bands. The concepts assessed will need an internal weapons bay to retain a low radar signature. Its propulsion system must employ adaptive-cycle engines.

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Adaptive-cycle engines and South Korea's industrial capacity

The adaptive-engine requirement raises questions over the programme's future feasibility. Designing these engines involves technological complexity that exceeds current domestic industrial capabilities. South Korea expects to secure certification for its first domestically manufactured engine, the KTF16000, only in the early 2040s. Local specialists caution that the current engine's estimated output may be inadequate for a large sixth-generation aircraft.

Conceptual design details and parallel programmes

Details released by ADD indicate that the initial concept is a twin-engined aircraft without tail stabilisers. The design uses a delta wing supplemented by forward control surfaces. Visually, this arrangement resembles Boeing's US F-47 project. However, the proposed South Korean aircraft is smaller, at roughly 16 metres long with an 11-metre wingspan. Its dimensions are based on compatibility with IRIS-T and Meteor missiles.

Alongside this work, South Korea is also progressing with the development of new KF-21 fighter variants. Running both projects in parallel is an important consideration for the allocation of the country's funding and industrial capacity. The government is working on the KF-21EX variant to incorporate an internal weapons bay and reduce its radar signature in the X band. The model will also operate alongside collaborative combat drones. For now, authorities have not decided which of the two programmes will take budgetary priority.

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