Home Equipments F-35 Vs. KF-21 Boramae: A Detailed Comparison

F-35 Vs. KF-21 Boramae: A Detailed Comparison

F-35 Vs. KF-21 Boramae: In the ever-evolving landscape of modern aerial combat, two cutting-edge fighter aircraft have taken center stage: the F-35 Lightning II and the KF-21 Boramae. These advanced marvels of aerospace engineering represent the pinnacle of their respective nations’ ambitions, each designed to excel in its own unique way.

In our comprehensive blog post, we delve into the world of military aviation to compare and contrast these formidable fighters. From their origins and development to their stealth capabilities and intended roles, we will explore the key aspects that define the F-35 and the KF-21.

F-35 Vs. KF-21 Boramae

Here’s a comparison table of the F-35 and KF-21 Boramae aircraft:

Characteristic F-35 Lightning II KF-21 Boramae
Crew 1 1 or 2
Length 51.4 ft (15.7 m) 16.9 m (55 ft 5 in)
Wingspan 35 ft (11 m) 11.2 m (36 ft 9 in)
Height 14.4 ft (4.4 m) 4.7 m (15 ft 5 in)
Wing Area 460 sq ft (43 m2) 46.5 m2 (501 sq ft)
Empty Weight 29,300 lb (13,290 kg) 11,800 kg (26,015 lb)
Gross Weight 49,540 lb (22,471 kg) 17,200 kg (37,920 lb)
Max Takeoff Weight 65,918 lb (29,900 kg) 25,600 kg (56,400 lb)
Fuel Capacity 18,250 lb (8,278 kg) internal 6,000 kg (13,227 lb) internal
Powerplant 1 × Pratt & Whitney F135-PW-100 afterburning turbofan, 28,000 lbf (125 kN) thrust dry, 43,000 lbf (191 kN) with afterburner 2 × General Electric F414-GE-400K, manufactured under license by Hanwha Aerospace turbofan, 57.8 kN (13,000 lbf) thrust each dry, 97.9 kN (22,000 lbf) with afterburner
Maximum Speed Mach 1.6 at altitude Mach 1.81, 1,400 mph (2,200 km/h)
Range 1,500 nmi (1,700 mi, 2,800 km) Combat Range: 1,000 km (620 mi, 540 nmi)
Combat Range 669 nmi (770 mi, 1,239 km) interdiction mission (air-to-surface) on internal fuel, 760 nmi (870 mi; 1,410 km), air-to-air configuration on internal fuel Not specified
Service Ceiling 50,000 ft (15,000 m) Not specified
G Limits +9.0 Not specified
Wing Loading 107.7 lb/sq ft (526 kg/m2) at gross weight Not specified
Thrust/Weight 0.87 at gross weight (1.07 at loaded weight with 50% internal fuel) Not specified
Armament 1 × 25 mm GAU-22/A 4-barrel rotary cannon, 180 rounds 1× 20 mm M61A2 Vulcan rotary autocannon
Hardpoints 4 × internal stations, 6 × external stations on wings with a capacity of 5,700 pounds (2,600 kg) internal, 15,000 pounds (6,800 kg) external, 18,000 pounds (8,200 kg) total weapons payload, with provisions to carry combinations of various missiles and bombs 10 (six under-wing and four under-fuselage) hardpoints with various missile and bomb capabilities
Avionics AN/APG-81 AESA radar, AN/AAQ-40 Electro-Optical Targeting System, AN/AAQ-37 Electro-Optical Distributed Aperture System, AN/ASQ-239 Barracuda electronic warfare/electronic countermeasures system, AN/ASQ-242 CNI suite (which includes various communication systems and navigation aids) Active Electronically Scanned Array (AESA) radar, Electro-Optical Targeting Pod (EO TGP), Infra-Red Search and Track (IRST), Electronic Warfare Suite (EW Suite)

F-35 Lightning II vs. KF-21 Boramae: A Detailed Comparison

The world of military aviation is witness to a fascinating showdown between two state-of-the-art fighter aircraft: the F-35 Lightning II and the KF-21 Boramae. Let’s dive into a detailed comparison of these remarkable aircraft, exploring their origins, capabilities, and intended roles.

Origins and Development:

F-35 Lightning II: The F-35 Lightning II, produced by Lockheed Martin, is an American family of stealth multirole combat aircraft. It descended from the Lockheed Martin X-35, which won the Joint Strike Fighter (JSF) program in 2001. The development is predominantly funded by the United States, with contributions from NATO countries and U.S. allies.

KF-21 Boramae: The KF-21 Boramae is a fighter aircraft program led by the South Korean government, with major partner Korea Aerospace Industries (KAI). Indonesia also has a stake in the program. It represents South Korea’s second domestic fighter jet development program.

Stealth Capabilities:

F-35 Lightning II: The F-35 is renowned for its stealth capabilities, designed to evade enemy radar detection. Its radar-absorbent materials and unique design minimize its radar cross-section, making it a challenging target for adversaries.

KF-21 Boramae: The KF-21 claims to incorporate stealth features but does not carry weapons in internal bays like fifth-generation fighters. Plans to introduce internal bays later in development have been discussed.

Variants and Roles:

F-35 Lightning II: The F-35 has three main variants:

  • F-35A: Conventional takeoff and landing (CTOL) variant designed for the U.S. Air Force.
  • F-35B: Short take-off and vertical landing (STOVL) variant for the U.S. Marine Corps.
  • F-35C: Carrier-based (CV/CATOBAR) variant tailored for the U.S. Navy.

These variants serve various roles, including air superiority, strike missions, electronic warfare, and intelligence, surveillance, and reconnaissance (ISR).

KF-21 Boramae: The KF-21 is aimed at serving as an advanced multirole fighter for South Korea and Indonesia. It represents South Korea’s domestic fighter development program, with a focus on offering advanced capabilities.

Ownership and Production:

F-35 Lightning II: The F-35 program is primarily owned by the United States, with partner countries participating in development and production. The U.S. plans to acquire a significant number of F-35s, becoming a cornerstone of its tactical aviation.

KF-21 Boramae: South Korea leads the KF-21 program, with Indonesia and private partners holding shares. The first prototype was unveiled in 2021, with test flights in 2022. Production is scheduled to begin in 2026, and South Korea plans to deploy a substantial fleet.

Export Potential:

F-35 Lightning II: The F-35 is a well-established aircraft with export agreements in place. Numerous countries have ordered or expressed interest in the aircraft, making it a global asset.

KF-21 Boramae: The KF-21 is designed for both domestic and export markets. South Korea expects to deploy a significant number of these aircraft and may offer them to international customers.

Avionics and Sensor Suite:

F-35 Lightning II: The F-35 is equipped with cutting-edge avionics, including the AN/APG-81 AESA radar, providing excellent situational awareness. It also features advanced sensor systems like the Distributed Aperture System (DAS) for 360-degree monitoring.

KF-21 Boramae: The exact details of the KF-21’s avionics and sensor suite are not fully disclosed, but it is expected to incorporate modern sensor technology to support its multirole capabilities.

Range and Payload:

F-35 Lightning II: The F-35 has a combat radius of approximately 669 nautical miles (770 miles) for interdiction missions on internal fuel. It can carry a wide range of air-to-air and air-to-ground munitions.

KF-21 Boramae: Specific range data for the KF-21 is not provided, but it is expected to have a competitive combat radius. It has ten hardpoints for carrying a variety of missiles and bombs.

International Cooperation:

F-35 Lightning II: The F-35 program involves international cooperation, with multiple countries participating in its development and procurement. This has created a global network of F-35 operators.

KF-21 Boramae: While the KF-21 program includes international partners like Indonesia, it represents South Korea’s ambition to develop and produce its indigenous fighter aircraft.

Production Timeline:

F-35 Lightning II: The F-35 has been in production for several years, with various variants already in service with the U.S. military and its allies.

KF-21 Boramae: The KF-21 is still in the prototype and testing phase, with production scheduled to commence in the mid-2020s.


In conclusion, the F-35 Lightning II and the KF-21 Boramae represent two remarkable facets of contemporary fighter aircraft development. The F-35, born out of a multinational collaboration and boasting fifth-generation stealth capabilities, stands as a global powerhouse in air superiority and multirole missions. With a proven track record and an expansive network of international operators, it has firmly established itself as a cornerstone of modern air warfare.

On the other hand, the KF-21 Boramae signifies South Korea’s foray into indigenous fighter jet production, showcasing its ambition to become self-reliant in defense technology. While the KF-21 may not match the F-35’s stealth capabilities, it offers a competitive edge in terms of cost-effectiveness and adaptability.

These aircraft reflect the evolving landscape of military aviation, with the F-35’s maturity and international reach contrasting with the KF-21’s promise as a domestically developed and potentially exportable fighter. As both aircraft continue their journeys, they illuminate the diverse approaches nations take to secure their air sovereignty and influence the future of aerial warfare.


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