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Description
Meet the KF-X/IF-X, the 4.5 or 5th Generation Stealth Multirole fighter. The Genesis of all IFX families in my "alternate universe".

Description, courtesy of Wikipedia:

The Korea Aerospace Industries KF-X/IF-X is a South Korean program to develop an advanced multirole fighter for the Republic of Korea Air Force (ROKAF) and Indonesian Air Force (TNI-AU), spearheaded by South Korea with Indonesia as the primary partner. The initial operational requirements for the KF-X/IF-X program as stated by the ADD (Agency for Defence Development) were to develop a single-seat, twin-engine jet with stealth capabilities beyond either the Dassault Rafale or Eurofighter Typhoon, but still less than the Lockheed Martin F-35 Lightning II. The overall focus of the program is producing a 4.5th generation fighter with higher capabilities than a KF-16 class fighter by 2020. Quantities of the resulting fighter are planned at 120 for the ROK Air Force and 80 for the Indonesian Air Force. South Korea plans to procure it from 2023 to 2030.

The Agency for Defense Development has prepared two series of designs, one for an aircraft with aft horizontal stabilizers, and with a canard stabilizer. The aft-tail series has run through the iterations C101, C102, and C103, all with two engines and a single seat. The C102 design was further broken down into three variants: C102E with one engine, C102I with internal weapons and C102T with two seats. Similarly, the canard series had the iterations C201, C202 (also with variants E, I and T) and the current C203 follow the same pattern.

The agency proposes that either C103 or C203, whichever was chosen, would then advance through three design standards. Block 1 would be "reduced observable," which would be equivalent to the B-1B, Boeing F/A-18E/F Super Hornet and Eurofighter Typhoon. Block 1 would rely on fuselage and inlet shaping, edge alignment, radar-absorbing material, and semiconformal weapons carriage for reducing signature.

Block 2 would carry internal weapons, have conformal antennas, and sensors would be "integrated". There would be minimal gaps and additional radarabsorbing coating on the canopy, and the structure of the aircraft. It would be as stealthy as the F-117.

Block 3 would advance the aircraft to the level of the B-2, F-22 and F-35, but no details are given. All of this is a step beyond the previous concept. The aircraft is expected to be between the General Dynamics F-16 Fighting Falcon and the McDonnell Douglas F-15 Eagle in size. The C103 design with two engines of 18,000 lb. thrust each. According to a 2009 external review of the program, the empty mass of the KF-X should be 10.4 metric tons.

There are actually two ADD proposals, the C103 and C203 , both weighing 11 tons empty. They propose initially fielding a low-observable aircraft, then later versions would have full stealth and internal weapons bays. The C103 has ten external hardpoints. The ADD designs have the advantage of being worked on with Indonesia, the main foreign partner. The C103 have tail-aft sections, while the C203 has forward horizontal stabilizers.

General characteristics:

Crew: 1
Length: 15.6 m (51.18 ft)
Wingspan: 10.7 m (34.77 ft)
Height: 4.5 m (14.76. ft)
Powerplant: 2 × F414-GE-400K/EPE or EJ200 afterburning turbofan
Dry thrust: 13,000~13,500 lbf (57.8~60 kN) each
Thrust with afterburner: 20,250~22,000 lbf (90~97.7 kN) each

Performance:
Maximum speed: Mach 1.97

Avionics:
Datalink capabilities
AESA radar
IRST
E/O Targeting System (EOTS)

Description
Meet the KF-X/IF-X, the 4.5 or 5th Generation Stealth Multirole fighter. The Genesis of all IFX families in my "alternate universe".

Description, courtesy of Wikipedia:

The Korea Aerospace Industries KF-X/IF-X is a South Korean program to develop an advanced multirole fighter for the Republic of Korea Air Force (ROKAF) and Indonesian Air Force (TNI-AU), spearheaded by South Korea with Indonesia as the primary partner. The initial operational requirements for the KF-X/IF-X program as stated by the ADD (Agency for Defence Development) were to develop a single-seat, twin-engine jet with stealth capabilities beyond either the Dassault Rafale or Eurofighter Typhoon, but still less than the Lockheed Martin F-35 Lightning II. The overall focus of the program is producing a 4.5th generation fighter with higher capabilities than a KF-16 class fighter by 2020. Quantities of the resulting fighter are planned at 120 for the ROK Air Force and 80 for the Indonesian Air Force. South Korea plans to procure it from 2023 to 2030.

The Agency for Defense Development has prepared two series of designs, one for an aircraft with aft horizontal stabilizers, and with a canard stabilizer. The aft-tail series has run through the iterations C101, C102, and C103, all with two engines and a single seat. The C102 design was further broken down into three variants: C102E with one engine, C102I with internal weapons and C102T with two seats. Similarly, the canard series had the iterations C201, C202 (also with variants E, I and T) and the current C203 follow the same pattern.

The agency proposes that either C103 or C203, whichever was chosen, would then advance through three design standards. Block 1 would be "reduced observable," which would be equivalent to the B-1B, Boeing F/A-18E/F Super Hornet and Eurofighter Typhoon. Block 1 would rely on fuselage and inlet shaping, edge alignment, radar-absorbing material, and semiconformal weapons carriage for reducing signature.

Block 2 would carry internal weapons, have conformal antennas, and sensors would be "integrated". There would be minimal gaps and additional radarabsorbing coating on the canopy, and the structure of the aircraft. It would be as stealthy as the F-117.

Block 3 would advance the aircraft to the level of the B-2, F-22 and F-35, but no details are given. All of this is a step beyond the previous concept. The aircraft is expected to be between the General Dynamics F-16 Fighting Falcon and the McDonnell Douglas F-15 Eagle in size. The C103 design with two engines of 18,000 lb. thrust each. According to a 2009 external review of the program, the empty mass of the KF-X should be 10.4 metric tons.

There are actually two ADD proposals, the C103 and C203 , both weighing 11 tons empty. They propose initially fielding a low-observable aircraft, then later versions would have full stealth and internal weapons bays. The C103 has ten external hardpoints. The ADD designs have the advantage of being worked on with Indonesia, the main foreign partner. The C103 have tail-aft sections, while the C203 has forward horizontal stabilizers.

General characteristics:

Crew: 1
Length: 15.6 m (51.18 ft)
Wingspan: 10.7 m (34.77 ft)
Height: 4.5 m (14.76. ft)
Powerplant: 2 × F414-GE-400K/EPE or EJ200 afterburning turbofan
Dry thrust: 13,000~13,500 lbf (57.8~60 kN) each
Thrust with afterburner: 20,250~22,000 lbf (90~97.7 kN) each

Performance:
Maximum speed: Mach 1.97

Avionics:
Datalink capabilities
AESA radar
IRST
E/O Targeting System (EOTS)