Engineering:Sukhoi Su-75 Checkmate

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Short description: Russian fighter aircraft
Su-75 Checkmate
LTA / ЛТС (LTS)
A static non-flying prototype of the LTA Checkmate at the MAKS Airshow 2021
General information
TypeStealth multirole fighter
National originRussia
ManufacturerSukhoi Komsomolsk-on-Amur Aircraft Plant
Designer
Sukhoi Design Bureau

The Sukhoi Su-75 Checkmate (Russian: Сухой Су-75), also designated as the Light Tactical Aircraft (LTA; Russian: Лёгкий Тактический Самолёт - ЛТС, romanized: Lyogkiy Takticheskiy Samolyot - LTS),[1][2] is a single-engine, stealth fighter aircraft under development by Sukhoi for export and for the Russian Aerospace Forces.[3] The Sukhoi Design Bureau also designates the aircraft as T-75.[4]

Development

A static non-flying prototype was unveiled at the 2021 MAKS air show with President of Russia Vladimir Putin in attendance. The Checkmate's maiden flight was first scheduled for 2023, then delayed to 2024, and again to 2025;[5] with initial deliveries planned for 2026 – 2027.[6][7][8][9] The Checkmate is designed to be low cost for exports,[10] and competes with the Lockheed Martin F-35 Lightning II and Shenyang FC-31 aircraft of the same light to medium-weight category.[11][12][13] Production is forecast for 300 planes over 15 years.[14]

According to the chief executive of Rostec, Sergei Chemezov, the LTS Checkmates are expected to cost US $25–30 million each.[15]

Su-75 Checkmate development was delayed due to international sanctions[16] on Russia caused by the Russo-Ukrainian war, whereby Russia could not import semiconductors[17] and high-tech machining equipment from the European Union.[18] The potential export sales also stalled because Russia cannot trade using U.S. dollars.[19]

According to the Center for Security Policy's Maya Carlin in May 2023, sanctions from the war "crippled" the aircraft's development. The United Arab Emirates (UAE) "paused" its participation, which removed "critical" funding.[20]

At the 2025 Dubai Airshow Sergey Bogdan has said that the first flight article is being finalized, and suggested that the first flight will take place in the beginning of 2026.[21] Sergey Chemezov said that first flight will happen in the "nearest future" and that the plane will begin ground testing shortly.[22]

Design

The Su-75 has a diverterless supersonic inlet (DSI), a v-tail and internal weapons bays—all features intended to reduce radar signature. The shape of the inlet, called "U-shape" by its designers, is intended to reduce the aircraft's radar cross-section (RCS) compared to the company's preceding Su-57 design.[23] The wing area appears large, which has been interpreted by correspondent David Axe to imply that Sukhoi designed the fighter to fly and engage in combat at high altitudes—40,000 ft (12,000 m) or higher.[3][24]

The angular ventral inlet, which wraps around the lower nose section, shares features with a DSI design concept first introduced[25][26] in the Boeing X-32 aircraft.[27][28][7][29] A diverterless supersonic inlet (DSI) is mechanically simple; DSI can reduce cost compared to more intricate inlet designs such as the McDonnell Douglas F-15 or Sukhoi Su-27.[30] Instead of a conventional empennage, the Su-75 has a v-tail similar to that of Northrop YF-23.[31][28] Instead of a set of elevators and a tail separately controlling pitch and yaw, a pair of combined ruddervators fulfil both roles. However, ruddervators require more sophisticated flight-control systems than conventional empennages.[31]

According to the jet's designers, the Checkmate is designed to fly with a range of up to 3,000 km (1,864 mi), carry a payload of up to 7,400 kg (16,314 lb), and reach speeds of up to Mach 1.8 to 2.0.[8][32][33] The fighter will also feature an internal weapons bay with five missiles and an autocannon.[32][34]

Patents published in 2023 indicate that the initial design had been modified with changes to the fuselage sides, strakes and the air intakes to reduce radar signature. Mainly, the new design appears to have increased the lifting surface area of the airframe.[35]

Engine

Mock-up of the Checkmate's engine

The powerplant appears to be a variant of the Saturn AL-51F-1 engine (initially known by development designation izdeliye 30) which will also power the Su-57M variant.[36][4] The AL-51F-1 is designed to be 30% lower specific weight than its AL-41F1 predecessor, and up to 18% more effective, with an estimated thrust of 107.9 kN (24,300 lbf) dry and 166.8 kN (37,500 lbf) in afterburner. Once in series production, the AL-51F-1 will have a much longer life span than other Russian engines.[37][38]

Cockpit

Due to restrictions preventing taking cockpit photos, NBC News Matt Bodner, the first Western journalist able to see the jet in person, provided a preview without a point of view photo. According to Bodner, the cockpit layout is identical to the Su-57 with a glass cockpit with two 38 cm (15 in) main multi-functional LCD displays similar to the arrangement of the Su-35S. The cockpit has a wide-angle (30° by 22°) head-up display (HUD).[39]

Avionics

The electronic infrastructure of the Checkmate is all open-architecture and makes use of "Matryoska" diagnostics systems that are mostly on-board.[13] According to Yuri Beliy, the NIIP radar design bureau plans to develop a low-cost AESA radar for the aircraft.[13] According to then-Deputy Prime Minister Yury Borisov, the Checkmate will share the same components and avionics as the Su-57 as a cost-reduction mechanism by the Sukhoi Design Bureau.[40][41]

Checkmate's armaments were displayed beside the non-flying prototype airframe

Potential operators

Rostec is anticipating that Argentina, India, Vietnam and Iran will become the primary export destinations for the aircraft, with the African market also showing interest.[42] In 2021 Sukhoi estimated the demand at 300 planes, and aimed to export the Su-75 to African countries over the following 15 years.[43][40] At the SITDEF-2021 arms show held in Peru, Alexander Mikheev, the General Director of product export of Rosoboronexport, stated that there was interest in the Su-75 in a number of South American countries.[44] In July 2023, Dmitry Shugaev, director of Russia’s Federal Service for Military-Technical Cooperation, confirmed that Nigeria was interested in the design.[35] The jet has also been pitched for export to Turkey, Saudi Arabia and United Arab Emirates.[45] Russia has also expressed interest in India participating in the Su-75 program.[46] Some experts suggest India should consider the Su-75 due to it being a cheaper alternative than other multirole fighters such as the JAS 39 Gripen.[47]

Specifications

Data from Rosoboronexport,[48] Flight Global,[49] Breaking Defense,[13] Suciu,[50] Global security[51] Lieser[52] and Filseth[53]

General characteristics

  • Crew: 1
  • Length: 17.7 m (58 ft 1 in)
  • Wingspan: 11.8 m (38 ft 9 in)
  • Height: 4.0 m (13 ft 1 in)
  • Max takeoff weight: 26,000 kg (57,320 lb)
  • Powerplant: 1 × NPO Saturn AL-51F-1 (derivative) afterburning turbofan[54], 161.9 kN (36,400 lbf) with afterburner

Performance

  • Maximum speed: Mach 1.8
    • Mach 1.06, 1,300 km/h (702 kn; 808 mph) at sea level
  • Range: 2,900 km (1,800 mi, 1,600 nmi)
  • Ferry range: 3,000 km (1,900 mi, 1,600 nmi)
  • Service ceiling: 16,500 m (54,100 ft)
  • g limits: +8.0
  • Rate of climb: 220 m/s (43,000 ft/min)
  • Thrust/weight: 1.0:1

Armament

  • Hardpoints: 5 internal, 6 external with a capacity of 7,400 kilograms (16,300 lb) maximum payload,with provisions to carry combinations of:
    • Missiles: 3 x BVRAAM and 2 x SRAAM stored in the internal weapons bay, 6 × external, 2 × R-77, 3 × R-73, 2 × Kh-35E anti-ship missiles

Avionics

See also

Related development

Aircraft of comparable role, configuration and era

Related lists

References

  1. ↑ "UAC :: Su-75" (in en). https://www.uacrussia.ru/en/aircraft/lineup/military/Su-75/. 
  2. ↑ "ОАК :: Су-75" (in ru). https://www.uacrussia.ru/ru/aircraft/lineup/military/Su-75/. 
  3. ↑ 3.0 3.1 Axe, David (18 July 2021). "Russia's New Fighter Breaks Cover—It's Got 'Stealth' Written All Over It" (in en). Forbes (Jersey City, New Jersey, USA). ISSN 0015-6914. https://www.forbes.com/sites/davidaxe/2021/07/18/russias-new-fighter-breaks-cover-its-got-stealth-written-all-over-it/. Retrieved 30 July 2021. 
  4. ↑ 4.0 4.1 Donald, David (2021-07-20). "New Sukhoi Fighter Design Unveiled at MAKS". https://www.ainonline.com/aviation-news/defense/2021-07-20/new-sukhoi-fighter-design-unveiled-maks. 
  5. ↑ "Борисов сообщил о переносе сроков первого полета Су-75 Checkmate — РБК" (in ru). https://www.rbc.ru/politics/17/06/2022/62ac705c9a7947b7559c8bcc. 
  6. ↑ (in ru)Interfax (Moscow, Russia). 15 August 2022. https://www.interfax.ru/business/856606. 
  7. ↑ 7.0 7.1 Newdick, Thomas (20 July 2021). "Russia's Checkmate Light Tactical Fighter Is Officially Unveiled (Updated)" (in en). https://www.thedrive.com/the-war-zone/41618/russias-checkmate-light-tactical-fighter-is-officially-unveiled. 
  8. ↑ 8.0 8.1 Isachenkov, Vladimir (20 July 2021). "Putin hails Russia's air power as new fighter goes on view" (in en). Associated Press (New York City, NY, USA). https://apnews.com/article/technology-europe-business-russia-14f649c0a20dfca9136bdf07fddb253b. 
  9. ↑ Jenkins, Cameron (20 July 2021). "Russia unveils prototype for advanced stealth fighter jet" (in en). The Hill (Washington, D.C., USA: Nexstar Media Group). ISSN 1521-1568. OCLC 31153202. https://thehill.com/policy/international/russia/563858-russia-unveils-prototype-for-advanced-stealth-fighter-jet. 
  10. ↑ "Putin Unveils Russia's New Single Engine Jet 'LTS Checkmate Fighter'". 20 July 2021. https://www.defenseworld.net/news/30066/Putin_Unveils_Russia___s_New_Single_Engine_Jet____LTS_Checkmate_Fighter___. 
  11. ↑ Szondy, David (26 July 2021). "Sukhoi shows off Checkmate 5th-Gen fighter to compete with F-35" (in en-US). https://newatlas.com/military/sukhoi-checkmate-5th-generation-fighter/. 
  12. ↑ Liu, Zhen (2021-07-25). "India expected to seek new Russian stealth fighter to counter China" (in en). https://www.scmp.com/news/china/military/article/3142369/india-expected-seek-new-russian-stealth-fighter-amid-ongoing. 
  13. ↑ 13.0 13.1 13.2 13.3 Johnson, Reuben (2021-07-22). "Russia's New SU-75 Checkmate Promises A Lot. Can It Deliver?" (in en-US). https://breakingdefense.sites.breakingmedia.com/2021/07/russias-new-su-75-checkmate-promises-a-lot-can-it-deliver/. 
  14. ↑ Stolyarov, Gleb; Balmforth, Tom (2021-07-20). "Putin inspects new Russian fighter jet unveiled at air show". https://www.reuters.com/business/aerospace-defense/russia-expected-unveil-stealth-fighter-jet-air-show-attended-by-putin-2021-07-20/. 
  15. ↑ "Russian 'Checkmate' Stealth Fighter has Launch Customer, to Cost $30 Million Apiece". defenseworld.net. 2021-07-20. https://www.defenseworld.net/news/30067/Russian____Checkmate____Stealth_Fighter_has_Launch_Customer__to_Cost__30_Million_Apiece#.YPyBiECU-Uk. 
  16. ↑ "U.S. Treasury Sanctions Russia's Defense-Industrial Base, the Russian Duma and Its Members, and Sberbank CEO" (in en). U.S. Department of the Treasury. https://home.treasury.gov/news/press-releases/jy0677. 
  17. ↑ Seoul, Yang Jie in Tokyo and Jiyoung Sohn in (2022-03-19). "Chip Sanctions Challenge Russia's Tech Ambitions" (in en-US). The Wall Street Journal. ISSN 0099-9660. https://www.wsj.com/articles/chip-sanctions-challenge-russias-tech-ambitions-11647682202. 
  18. ↑ Eastwood, Brent M. (2022-03-31). "Is Russia's Su-75 Checkmate Stealth Fighter Doomed?" (in en-US). https://www.19fortyfive.com/2022/03/is-russias-su-75-checkmate-stealth-fighter-doomed/. 
  19. ↑ Parachini, John V.; Wilson, Peter A. (2022-01-06). "Is Russia's Su-75 'Checkmate' Aircraft a Case of Vapor Marketing?" (in en). RAND Corporation. https://www.rand.org/blog/2022/01/is-russias-su-75-checkmate-aircraft-a-case-of-vapor.html. 
  20. ↑ Carlin, Maya (2 May 2023). "Su-75: Russia's New Stealth Fighter Looks Doomed". https://www.19fortyfive.com/2023/05/su-75-russias-new-stealth-fighter-may-never-fly-thanks-to-ukraine-war/. 
  21. ↑ "Летчик Богдан: первый полет Су-75 Checkmate пройдет в 2026 году" (in ru). https://tass.ru/armiya-i-opk/25663147. 
  22. ↑ "Чемезов: Су-75 Checkmate в ближайшее время выйдет на стендовые испытания" (in ru). https://tass.ru/ekonomika/25661629. 
  23. ↑ Mikhail Strelets, Alexei Bulutov, Mikhail Nikitushkin, et. al., "Multifunctional supersonic single-engine aircraft", RU patent RU2770885C1, published 25 April 2022, issued 25 April 2022
  24. ↑ Axe, David (2021-07-22). "Who's Going To Pay for Russia's Checkmate Stealth Fighter? Probably Not Russia." (in en). https://www.forbes.com/sites/davidaxe/2021/07/22/whos-going-to-pay-for-russias-checkmate-stealth-fighter-probably-not-russia/. 
  25. ↑ "JSF Diverterless Supersonic Inlet". Code One Magazine. https://www.codeonemagazine.com/article.html?item_id=58. 
  26. ↑ "Su-75 turned out to be the most cost-effective fifth-generation machine? How likely is it to be in mass production?". https://inf.news/en/military/4387b942c65f84f7b7c5402a6b545565.html. 
  27. ↑ "New Russian Fighter in F-35 Class Echoes Other JSF Designs" (in en-US). 2021-07-19. https://www.airforcemag.com/new-russian-fighter-in-f-35-class-echoes-jsf-designs/. 
  28. ↑ 28.0 28.1 Makichuk, Dave (2021-07-20). "Checkmate: Russia's newest, most advanced fighter jet" (in en-US). https://asiatimes.com/2021/07/checkmate-russias-newest-most-advanced-fighter-jet/. 
  29. ↑ "Sukhoi officially Unveils the Checkmate, allegedly codenamed "Screamer" by US Intelligence" (in en-GB). 2021-07-20. https://theaviationgeekclub.com/sukhoi-officially-unveils-the-checkmate-allegedly-codenamed-screamer-by-us-intelligence/. 
  30. ↑ Axe, David. "Russia's New Fighter Breaks Cover—It's Got 'Stealth' Written All Over It" (in en). https://www.forbes.com/sites/davidaxe/2021/07/18/russias-new-fighter-breaks-cover-its-got-stealth-written-all-over-it/. 
  31. ↑ 31.0 31.1 Axe, David. "Look Closely At Russia's Checkmate Fighter—Its Tail Is One Key To Its Stealth" (in en). https://www.forbes.com/sites/davidaxe/2021/07/19/look-closely-at-russias-checkmate-fighter-its-tail-is-one-key-to-its-stealth/. 
  32. ↑ 32.0 32.1 (in en) Official presentation of the New Sukhoi LTS Checkmate or Screamer, 2021-07-20, https://www.youtube.com/watch?v=akFigd3UDXE, retrieved 2021-07-25 
  33. ↑ "Error: no |title= specified when using {{Cite web}}" (in ru). July 20, 2021. https://tvzvezda.ru/news/20217201539-triew.html. 
  34. ↑ "YouTube". https://www.youtube.com/watch?v=Gc2l8xWau60. 
  35. ↑ 35.0 35.1 Lenkov, Alexey (28 July 2023). "Nigeria is interested in the Su-75, which is in the prototype stage". bulgarianmilitary.com. https://bulgarianmilitary.com/2023/07/28/nigeria-is-interested-in-the-su-75-which-is-in-the-prototype-stage/. 
  36. ↑ Díaz, Pablo (2021-07-20). "Sukhoi Checkmate: An advanced yet affordable match for the F-35 Lightning II". https://www.aviacionline.com/2021/07/sukhoi-checkmate-an-advanced-yet-affordable-match-for-the-f-35-lightning-ii/. 
  37. ↑ Wolf, Fabrice (2019-12-09). "Su-57's new engine not yet available" (in en). https://www.meta-defense.fr/en/2019/12/09/the-new-57-engine-is-not-yet-available/. 
  38. ↑ Newdick, Thomas; Rogoway, Tyler (2021-07-16). "Now We Know Russia's Mysterious New Fighter Is A Single-Engine Design (Updated)" (in en). https://www.thedrive.com/the-war-zone/41576/now-we-know-russias-mysterious-new-fighter-is-a-single-engine-design. 
  39. ↑ (in en) Russia Unveils New Fighter Jet Viewed As Competitor To America's F-35, NBC News, 2021-07-26, https://www.youtube.com/watch?v=Tf-3HcikmzE, retrieved 2021-07-30 
  40. ↑ 40.0 40.1 (in ru). https://www.vedomosti.ru/technology/news/2021/07/20/878918-chemezov-nazval-tsenu-novogo-rossiiskogo-istrebitelya. 
  41. ↑ (in ru). 20 July 2021. https://www.vedomosti.ru/business/news/2021/07/20/878934-novii-rossiiskii-istrebitel-checkmate-podnimetsya-v-vozduh-v-2023-godu. 
  42. ↑ "The Checkmate aircraft will have no built-in gun for the first time in decades" (in en). 2005-11-22. https://english.pravda.ru/news/science/71220-checkmate/. 
  43. ↑ (in ru). 17 September 2021. https://www.vedomosti.ru/politics/news/2021/09/17/887073-istrebitel-checkmate. 
  44. ↑ "Russia to Feature Cutting-Edge Checkmate Fighter Prototype at Dubai Air Show" (in en). Indian Defence News. 10 November 2021. https://www.indiandefensenews.in/2021/11/russia-to-feature-cutting-edge.html?m=1. 
  45. ↑ "A new arms race? Putin's friend leads Russian effort to sell weapons to U.S. allies". NBC News. https://www.nbcnews.com/news/world/putins-friend-leads-russian-effort-sell-weapons-us-allies-rcna6599. 
  46. ↑ "Su-75 ‘Checkmate’: Russia Could Invite India To Join The ‘Most Affordable’ Fifth Gen Fighter Jet Project – Reports". The Eurasian Times. 7 February 2023. https://www.eurasiantimes.com/russia-india-to-join-the-development-of-su-75-checkmate/. 
  47. ↑ "Should India buy Su-75 ‘Checkmate’ and What is the alternative?". 6 January 2023. https://ssbcrackexams.com/should-india-buy-su-75-checkmate-and-what-is-the-alternative/. 
  48. ↑ "Rosobornexport Su-75 presentation at Zhuhai Air Show 2024" (Press release). Rosoboronexport. 13 November 2024.
  49. ↑ Karnozov, Vladimir (21 July 2021). "Russia targets low cost, high performance with Su-75 Checkmate fighter" (in en). DVV Media Group. https://www.flightglobal.com/defence/russia-targets-low-cost-high-performance-with-su-75-checkmate-fighter/144693.article. 
  50. ↑ Suciu, Peter (2021-07-26). "Russia's New Checkmate Su-75 Stealth Fighter Has Another Trick Up Its Sleeve" (in en-US). https://www.19fortyfive.com/2021/07/russias-new-checkmate-su-75-stealth-fighter-has-another-trick-up-its-sleeve/. 
  51. ↑ "Sukhoi Su-75 Checkmate - LTS - Light Tactical Aircraft" (in en). Suspilne. 29 November 2022. https://www.globalsecurity.org/military/world/russia/lts-specs.htm. 
  52. ↑ Lieser, Ethen Kim (2021-07-22). "Russia's New Su-75 'Checkmate' Stealth Fighter Has a Serious Problem" (in en-US). https://www.19fortyfive.com/2021/07/russias-new-su-75-checkmate-stealth-fighter-has-a-serious-problem/. 
  53. ↑ Filseth, Trevor (2021-07-24). "Russia's New 'Checkmate' Su-75 Stealth Fighter Has Enormous Wings" (in en). https://nationalinterest.org/blog/buzz/russia%E2%80%99s-new-%E2%80%98checkmate%E2%80%99-su-75-stealth-fighter-has-enormous-wings-190301. 
  54. ↑ "Checkmate details emerge, triggering some new questions and specific areas of concern". https://www.army-technology.com/comment/checkmate-details-emerge-questions/. 



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