KF-X Fighter: Pushing Paper, or Peer Program?

May 20, 2013 14:06 UTC by Defense Industry Daily staff

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South Korea has been thinking seriously about designing its own fighter jet since 2008. The ROK defense sector has made impressive progress, and has become a notable exporter of aerospace, land, and naval equipment. The idea of a plane that helps advance their aerospace industry, while making it easy to add new Korean-designed weapons, is very appealing. On the flip side, a new jet fighter is a massive endeavor at the best of times, and wildly unrealistic technical expectations didn’t help the project. KF-X has progressed in fits and starts, and became a multinational program when Indonesia joined in June 2010. As of March 2013, however, South Korea has decided to put the KF-X program on hold for 18 months, while the government and Parliament decide whether it’s worth continuing.

Indonesia has reportedly contributed IDR 1.6 trillion since they joined in July 2010 – but that’s just $165 million of the DAPA’s estimated WON 6 billion (about $5.5 billion) development cost, and there’s good reason to believe that even this development budget is too low. This article discusses the KFX/IFX fighter’s proposed designs and features, and chronicles the project’s progress and setbacks since 2008.

Changing Stories: The “F-33/ Boramae” KF-X Fighter

Unrealistic early visions of an F-35 class stealth aircraft developed on the cheap produced some attention-getting models, but they appear to have given way to the idea of a fighter with slightly better kinematic performance than an F-16C/D Block 50, along with more advanced electronics that include a made-in-Korea AESA radar, the ability to carry a range of new South Korean weapons under development, and a better radar signature. The Jakarta Globe adds that the plane is eventually slated to get the designation F-33.

The project goes ahead, the 1st step will involve picking a foreign development partner, and the next step will involve choosing between 1 of 2 competing designs. The C103 design’s conventional fighter layout would look somewhat like the F-35, while the C203 design follows the European approach and uses forward canards in a stealth-shaped airframe. It’s likely that the choice of their foreign development partner will determine the design choice pursued.

Either aircraft would be a twin-engine fighter weighing around 10.4 tonnes, with stealth shaping. In order to keep ambitions within the bounds of realism, KFX Bock 1 fighters would only have to meet the radar cross-section of the F/A-18E/F Super Hornet or Eurofighter Typhoon. Sources have used figures of 0.1 – 1.0 square meters.

Note that even this specification amounts to developing a plane similar to or more advanced than the JAS-39E/F Gripen, from a lower technological base, with less international help on key components, all for less development money than a more experienced firm needed to spend. South Korea’s own KIDA takes a similar view, questioning the country’s technical readiness for something this complicated, and noting an overall cost per aircraft that’s twice as much as similar imported fighters.

KFX Block 2 would add internal weapon bays. Present plans call for Block 1 would be compatible with the bays, and hence upgradeable to Block 2 status, but Block 1 planes wouldn’t begin with internal bays. The fighter’s size and twin-engine design offer added space compared to a plan like the Gripen, but this feature will still be a notable design challenge. Additional tolerance and coating improvements are envisioned to reduce stealth to the level of an F-117: about 0.025 square meters.

KFX Block 3 would aim for further stealth improvements to the level of the B-2 bomber or F-35.

No timeline has been discussed for Block 2 and Block 3 improvements, and at this stage of the program, any dates given would be wildly unreliable anyway.

KF-X: Program & Prospects

The KF-X project remains a “paper airplane,” without even a prototype. The program was reportedly postponed until April 2011 due to financial and technological difficulties, and now a second postponement appears to extend to June 2014. If South Korea elects to proceed at all. The ROK Agency for Defense Development says that if full-scale development begins in October 2014, the 1st KF-X Block 1 prototype flight wouldn’t take place until September 2020. Based on the history of other programs, the new plane would be hard pressed to enter service before 2025.

Indonesia is currently the only KF-X foreign development partner, with 20% of the project. The project is sometimes referred to as “IFX” (Indonesia Fighter eXperimental) in that country.

Turkey is a big defense customer for South Korea, and discussions have been held concerning KF-X, but Turkey wanted more control over the project than a 20% share, and no agreement has been forthcoming. The TuAF is already committed to buying about 100 F-35As to replace its F-4 Phantoms, and many of its F-16s as well. They’re also investigating the idea of designing their own fighter, and have enlisted Sweden’s Saab to assist (vid. March 20/13 entry).

In the interim, KAI’s FA-50 is emerging as a low-end fighter to replace existing ROKAF F-5s and F-4s, and South Korea is scheduled to have its F-X-3 competition decided before the KF-X resumes. That could leave them with a high-end fleet plan of 80-100 stealth-enhanced F-15SE Strike Eagles, split between new buys and upgrades. It’s fair to ask where an expensive KF-X program would fit in that mix, especially when even on-budget performance of WON 14 billion for development and production could buy and equip over 110 more F-15SEs, instead of 130-150 “F-33s”.

Moreover, if KF-X was developed, how big would the 2025-2040 export market really be? Even in a hypothetical market where production lines for the F-16, F/A-18 family, Eurofighter, and Rafale had all shut down, that still leaves South Korea competing for mid-tier purchases against China’s J-10, J-11, and “J-31″, Russia’s SU-35 and possibly its MiG-35, Sweden’s JAS-39E/F, and the USA’s F-35.

On the other hand, KAI needs development work after the FA-50 is done. As one 2009 article asked, how far can industrial nationalism go? The next 18 months will offer an answer to that question.

Contracts & Key Events

May 16/13: Indonesia. Indonesian Defense Minister Purnomo Yusgiantoro says that they remain committed to the KFX/IFX program. The Jakarta Post:

“We have told our South Korean counterparts that we will continue doing our part. Whatever their decision is, and whatever technology they focus on, we will follow their lead and our 20 percent of share will remain,” Purnomo said…. TB Hasanuddin of House Commission I on defense and foreign affairs, said that about Rp 1.6 trillion ($164.8 million) was already spent on the project.”

The question is whether South Korea chooses to pick up the project again, after the 18-month delay is over.

April 29/13: Details. Aviation Week recaps the ROK ADD’s KF-X plan (q.v. Feb 18/13 entry), and quotes “a former air force officer who has been involved in planning for KF-X” to say that radar cross-section for Block 1 will be between 0.1 – 1.0 square meters. It adds that the choice between the conventional layout C103 and C203 canard design probably comes down to the development partner Korea chooses: C103 if American, C203 if European.

Candidate engines for the twin-engine design are reportedly the GR F404 used in the FA-50, Eurojet’s EJ200 used in the Eurofighter, or GE’s F414 used in the F/A-18E/F Super Hornet, JAS-39E/F Gripen NG, and India’s Tejas Mk.II. Snecma’s M88, used in Dassault’s Rafale, reportedly isn’t a candidate. Aviation Week.

April 5/13: South Korean media detail a proposal from EADS to produce 80% of F-X Phase 3′s 60 fighters at KAI, if DAPA picks their Eurofighter. The Yonhap report also discusses this potential industrial boost for KAI in the context of the KF-X program,:

“Many have been calling on the Park Geun-hye administration to promptly make a decision to either go ahead with the large-scale airplane development project or put on the brakes if it is deemed economically unsustainable.”

The rest of the Yonhap report may be switching contexts to the F-X-3 high-end fighter acquisition, as it describes a decision to be made by June 2013, as part of a renewed emphasis on major defense projects in light of North Korea’s actions. That doesn’t entirely track with previous reports that place resumption of KF-X at June 2014, if it happens at all. It does track with reports concerning the F-X-3 program, so the confusion could just be poor writing. What is true is that provocations from North Korea are very much a double-edged sword for KF-X. On the one hand, they boost the idea of defense spending generally. On the other hand, they raise needs like anti-submarine warfare, missile defense improvements, etc. that will be higher priorities than KF-X. Yonhap News Service | Hankoryeh.

March 20/13: Turkey. The Turks appear to be picking an independent course toward their future fighter aircraft, in line with rumors that they wanted more control than the KF-X program could give them. Their SSM signed an August 2011 deal with Turkish Aerospace Industries (TAI) to carry out the conceptual design work, and recent reports add a preliminary agreement between TAI and Saab Group for technical assistance. Reports add that TAI is expected to acquire Saab’s aircraft design tools, which would make cooperation much easier.

These moves don’t completely rule out KF-X participation, but they do weight the odds the other way. Defense Industry Undersecretary Murad Bayar says that Turkey’s project began in 2012, adding that after some modeling trials, one of the designs has matured. After completing the design phase, the undersecretary will offer a program plan to Turkey’s Defense Industry Executive Committee.

Turkey faces some of the same dilemmas as South Korea. If 2023 is the first flight date for a 4.5 generation fighter, there’s a real risk that the design will be outmoded from the outset. On the other hand, designing and prototyping an indigenous jet from scratch takes time, and technical overreach versus current capabilities is incredibly risky. One “top official from a Western aircraft maker” told Hurriyet that Turkey may already be headed down that path: “…we had to step back when we understood that the technical requirements for the aircraft are far from being realistic.” Hurriyet | Hurriyet follow-on | AIN.

Feb 18/13: Details. Aviation Week reports that the Korea Institute for Defense Analysis has given KF-X a sharp negative review, even though it’s a defense ministry think-tank. In brief: the ROK isn’t technologically ready, and the project’s KRW 10+ trllion cost will be about twice as much as similar imported fighters. The 2013 budget is just KRW 4.5 billion, to continue studies.

Those studies are coming to some conclusions. The ROK ADD would still have a pick a design if they go ahead: either the conventional C103 fighter layout, or the C203 design with forward canards. Either aircraft would be a twin-engine fighter weighing around 10.4 tonnes, with stealth shaping. Bock 1 would only have to meet the radar cross-section of the F/A-18E/F Super Hornet or Eurofighter Typhoon. Block 2 would add internal weapon bays, which Block 1 would be compatible with but not have. Additional tolerance and coating improvements would reduce stealth to the level of an F-117. Block 3 would aim for further improvements to the level of the B-2 bomber or F-35.

The ROK Agency for Defense Development says that if full-scale development begins in October 2014, the 1st KF-X Block 1 prototype flight would take until September 2020. Based on the history of other programs, the new plane would be hard pressed to enter service before 2025. Aviation Week.

July 14/11: Indonesia confirmed. About a year after the MoU, The secretary general of Indonesia’s defence ministry, Erris Heriyanto, confirms the MoU’s terms to Indonesia’s ­official Antara news agency. KAI EVP Enes Park had called Indonesia’s involvement unconfirmed at the November 2010 Indo Defence show, but the Antara report appears to confirm it.

Turkey unveiled indigenous fighter plans of its own in December 2010, with the aim of fielding a fighter by 2023, but they haven’t made any commitments to KF-X. Flight International.

Dec 27/10: Yo-yo. South Korea’s Yonhap News agency reports that South Korea’s military is trying to swing KF-X back to a stealth fighter program, in the wake of North Korea’s Nov. 23 shelling on Yeonpyeong Island.

Subsequent reports indicate that the uncertainty about KF-X requirements leads to a program halt, until things can get sorted out. Yonhap.

Aug 9/10: Turkey. DAPA aircraft programs director Maj. Gen. Choi Cha-kyu says that Turkey is actively considering the K-FX fighter program, and would bear the same 20% project share as Indonesia if they come on board.

There are reports that in return, Turkey wants the ROK to pick the T-129 ATAK helicopter under the AH-X heavy attack helicopter program. Turkey bought the A129 Mangusta design from AgustaWestland, as part of a September 2007 contract to build 51-92 helicopters for the Turkish Army. Korea Times | Hurriyet.

Sept 12/09: KF-X drivers. Aviation Week offers their take on KFX’s positioning and industrial drivers:

“South Korea has decided that it can’t afford to build a cutting-edge stealth fighter…. it is considering building a gen-4.5 fighter, which might emerge as a jazzed up Typhoon or Super Hornet…. KFX would go into service in the early 2020s, perhaps a quarter of a century behind its technology level.

….Korea Aerospace will run out of fighter development work in a few years when the FA-50 is finished. It presumably does not have the technology to step straight from that to a combat drone. And it can’t spend next decade building up skills with an improved, single-seat FA-50, because the air force wants bigger aircraft…. the KFX would perhaps be an extreme example of sacrifices made in the name of self reliance or, perhaps, nationalism.”

July 23/09: KF-X. Defense News reports that “South Korea Drops 5th-Generation Fighter Plan,” but the title is misleading. The Weapon Systems Concept Development and Application Research Center of Konkuk University asked Boeing, Eurofighter, Lockheed Martin and Saab about their views on the per-plane cost estimate of $50 million, as well as budget-sharing ideas and technology transfer.

The problem is that South Korea’s specifications as described most closely mirror the ($150-180 million each, and $10+ billion development) F-22 Raptor, indicating that some reconciliation with reality is still necessary. The center will wrap up the feasibility study by October 2009, and DAPA is supposed to issue a decision on the KF-X initiative by year’s end. That will determine whether KF-X competes with/ supplants F-X-3, or proceeds as a separate program.

May 12/09: Changing gears. The Korea Times reports that the ROKAF’s Studies and Analyses Wing made an interim decision KF-X operational requirements in March 2009:

“Basic requirements call for a F-18E/F Super Hornet-class aircraft equipped with 4.5-generation semi-stealth functions, a domestically-built active electronically scanned array (AESA) radar ["based on accrued technologies from Israel"], a 32,000-pound of engine thrust and fully integrated weapons and sensors systems…. The KF-X aircraft would be either a single-engine fighter or a twin-engine one, [the source] added. It is the first time that KF-X operational requirements have been revealed.”

DAPA expects a final program decision around the end of 2009, and KF-X is expected to be part of the military’s 2010-14 force improvement package.

Jan 28/08: Reality check. The current program was scheduled to be followed by a KF-X program to develop and indigenous 5th generation/ stealth fighter to replace all F-5E Tiger IIs and F-4E Phantom IIs. After a feasibility study in 2008, the project would aim to produce the next-generation jets by 2020, with the goal of building 120 planes in a bid to secure proprietary technology and strengthen the country’s medium level fighter jet capacity. The goal is reportedly a single-seat, twin-engine plane with about 40,000 pounds of thrust from its engines, with more stealth than the Eurofighter Typhoon or Dassault Rafale, but less stealth than the F-35.

Now the Korea Development Institute has delivered a report concluding that the economic and industrial returns would be weak in proportion to its cost: about 3 trillion won/ $3 billion in returns, on a 10 trillion won investment. Papers quote foreign experts who estimate development costs of up to $12 billion. Korea’s Defense Acquisition Program Administration said the KDI report was for reference only, and the project decision would include other factors such as export prospects and technological capacity.

$7 billion is not a sum to be thrown away casually, and the difference would be very noticeable within South Korea’s defense budgets. Options like partnering with EADS on a stealthier version of the Eurofighter, for instance, might lower development costs and offer an additional option. Nevertheless, with F-X-3 likely to select a stealthy platform, a merger with the K-FX program and negotiation of an industrial deal seems more likely. Especially given South Korea’s demographic crunch, which will begin to bite by 2020. Chosun Ilbo | Korea Times.

Additional Readings

• DID – Korea’s T-50 Family Spreads Its Wings. Some accounts have KF-X as an FA-50 derivative.

• DID – Korea’s F-X Multi-Role Fighter Buys: Phases 2 & 3. The ROKAF’s high-end fighter plans.

• Aviation Week – KFX Timeline. To 2013.

• Flight International (Oct 27/11) – IN FOCUS: South Korea outlines strategy for indigenous fighter.

• World Politics Review (Aug 13/10) – Global Insider: Indonesia-South Korea Joint Fighter Project (subscription). Says that KF-X will be based on KAI’s T-50, and aims to produce a fighter on par with the F-16C/D Block 50.

• Defense News (July 15/10) – Indonesia Joins South Korean Fighter Effort

• The Jakarta Post (July 12/10) – RI-S. Korea KFX cooperation: The second best option?

• Aviation Week (Sept 21/09) – A Generation 4.5 Fighter for the 2020s