Sukhoi Su-75 Checkmate Explained

The Sukhoi Su-75 Checkmate (Russian: Сухой Су-75), also designated as the Light Tactical Aircraft (LTA;),[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.

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 and then slipped to 2024 but then it got delayed to 2025,[4] with initial deliveries planned for 2026–2027.[5] [6] [7] [8] The Checkmate is designed to be low cost and for export,[9] and may compete with the Lockheed Martin F-35 Lightning II and Shenyang FC-31 aircraft of the same light to medium-weight category.[10] [11] [12] Production is forecast to be 300 planes over 15 years.[13] [14]

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

Su-75 Checkmate development could be delayed due to international sanctions[16] on Russia caused by the Russo-Ukrainian War, and 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]

In July 2023, analyst Maya Carlin of the Center for Security Policy wrote that sanctions against Russia, due to the ongoing invasion of Ukraine had slowed or stopped the aircraft's development. In particular noted was the loss of funding from the United Arab Emirates due to sanctions, which had been sustaining the Su-75's development, as the UAE seeks instead to acquire F-35s, with potential support from Israel.[20]

On 13 November 2023 Rostec announced that preparations had begun to place the SU-75 fighter into pre production.[21]

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 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— or higher.[22]

The angular ventral inlet, which wraps around the lower nose section, shares features with a DSI design concept first introduced[23] [24] in the Boeing X-32 aircraft.[25] [26] [27] 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.[28] Instead of a conventional empennage, the Su-75 has a v-tail similar to that of Northrop YF-23.[29] [26] 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.[29]

According to the jet's designers, the Checkmate is designed to fly with a range of up to 30000NaN0, carry a payload of up 74000NaN0, and reach speeds of up to Mach 1.8 to 2.0.[30] The fighter will also feature an internal weapons bay with five missiles and an autocannon.[31]

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.[20]

Engine

The powerplant appears to be the Saturn izdeliye 30 engine which will also power the Su-57M variant.[32] [33] The izdeliye 30 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 171.7 kN (38,600 lbf) in afterburner. Once in series production, the izdeliye 30 engine will have a much longer life span than other Russian engines.[34] [35]

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).

Avionics

The electronic infrastructure of the Checkmate is all open-architecture and makes use of "Matryoska" diagnostics systems that are mostly on-board. According to Yuri Beliy, the NIIP radar design bureau plans to develop a low-cost AESA radar for the aircraft. 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.[36] [37]

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.[38] In 2021 Sukhoi estimated the demand at 300 planes, and aimed to export the Su-75 to African countries over the following 15 years.[39] 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.[40] In July 2023, Dmitry Shugaev, director of Russia’s Federal Service for Military-Technical Cooperation, confirmed that Nigeria was interested in the design. The jet has also been pitched for export to Turkey, Saudi Arabia and United Arab Emirates.[41] Russia has also expressed interest in India participating in the Su-75 program.[42] 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.[43]

Notes and References

  1. Web site: UAC :: Su-75 . 2023-10-21 . . en.
  2. Web site: ОАК :: Су-75 . 2023-10-21 . . ru.
  3. Axe . David . David Axe . 18 July 2021 . Russia's New Fighter Breaks Cover—It's Got 'Stealth' Written All Over It . live . . en . Jersey City, New Jersey, USA . 0015-6914 . https://web.archive.org/web/20210718224616/https://www.forbes.com/sites/davidaxe/2021/07/18/russias-new-fighter-breaks-cover-its-got-stealth-written-all-over-it/ . 18 July 2021 . 30 July 2021.
  4. Web site: Борисов сообщил о переносе сроков первого полета Су-75 Checkmate — РБК . ru . Borisov Announces Postponement of Su-75 Checkmate First Flight . Demchenko . Natalia . RBK Group. 12 May 2024.
  5. News: 15 August 2022 . ru:Летные испытания истребителя Су-75 Checkmate перенесены на 2024 год . ru . Flight tests of the Su-75 Checkmate fighter have been postponed to 2024 . . Moscow, Russia . https://www.interfax.ru/business/856606 . live . 15 August 2022 . https://web.archive.org/web/20220815204456/https://www.interfax.ru/business/856606 . 15 August 2022.
  6. Web site: Newdick . Thomas . 20 July 2021 . Russia's Checkmate Light Tactical Fighter Is Officially Unveiled (Updated) . live . https://web.archive.org/web/20210720174155/https://www.thedrive.com/the-war-zone/41618/russias-checkmate-light-tactical-fighter-is-officially-unveiled . 20 July 2021 . The Drive . en.
  7. News: Isachenkov . Vladimir . 20 July 2021 . Putin hails Russia's air power as new fighter goes on view . en . . New York City, NY, USA . live . 20 July 2021 . https://web.archive.org/web/20210720134037/https://apnews.com/article/technology-europe-business-russia-14f649c0a20dfca9136bdf07fddb253b . 20 July 2021.
  8. News: Jenkins . Cameron . 20 July 2021 . Russia unveils prototype for advanced stealth fighter jet . en . . . Washington, D.C., USA . live . 20 July 2021 . https://web.archive.org/web/20210720151915/https://thehill.com/policy/international/russia/563858-russia-unveils-prototype-for-advanced-stealth-fighter-jet . 20 July 2021 . 1521-1568 . 31153202.
  9. Web site: 20 July 2021 . Putin Unveils Russia's New Single Engine Jet 'LTS Checkmate Fighter' . dead . https://web.archive.org/web/20210720182059/https://www.defenseworld.net/news/30066/Putin_Unveils_Russia___s_New_Single_Engine_Jet____LTS_Checkmate_Fighter___ . 20 July 2021 . 20 July 2021 . www.defenseworld.net.
  10. Web site: Szondy . David . 26 July 2021 . Sukhoi shows off Checkmate 5th-Gen fighter to compete with F-35 . live . https://web.archive.org/web/20210727004140/https://newatlas.com/military/sukhoi-checkmate-5th-generation-fighter/ . 27 July 2021 . 27 July 2021 . New Atlas . en-US.
  11. Web site: India expected to seek new Russian stealth fighter to counter China. South China Morning Post. en . Liu . Zhen . 2021-07-25 . https://web.archive.org/web/20210725101346/https://www.scmp.com/news/china/military/article/3142369/india-expected-seek-new-russian-stealth-fighter-amid-ongoing . 2021-07-25 . live.
  12. Web site: Johnson. Reuben. 2021-07-22. Russia's New SU-75 Checkmate Promises A Lot. Can It Deliver?. live. https://web.archive.org/web/20210722150948/https://breakingdefense.com/2021/07/russias-new-su-75-checkmate-promises-a-lot-can-it-deliver/. 2021-07-22. 2021-07-28. Breaking Defense. en-US.
  13. Web site: 2021-07-20. Putin inspects new Russian fighter jet unveiled at air show. 2021-07-20 . Reuters . Gleb . Stolyarov . Tom . Balmforth . https://web.archive.org/web/20210720091809/https://www.reuters.com/business/aerospace-defense/russia-expected-unveil-stealth-fighter-jet-air-show-attended-by-putin-2021-07-20/. 2021-07-20. live.
  14. Web site: Sukhoi Su-75 Checkmate – LTS – Light Tactical Aircraft. 2021-07-25. www.globalsecurity.org . 2021-07-24 . https://web.archive.org/web/20210725050209/https://www.globalsecurity.org/military/world/russia/lts-sales.htm . 2021-07-25 . live.
  15. News: Russian 'Checkmate' Stealth Fighter has Launch Customer, to Cost $30 Million Apiece. www.defenseworld.net . 2021-07-20 . https://web.archive.org/web/20210720195030/https://www.defenseworld.net/news/30067/Russian____Checkmate____Stealth_Fighter_has_Launch_Customer__to_Cost__30_Million_Apiece . 2021-07-20 . live.
  16. Web site: U.S. Treasury Sanctions Russia's Defense-Industrial Base, the Russian Duma and Its Members, and Sberbank CEO . 2022-04-29 . . en . 11 April 2022 . https://web.archive.org/web/20220411074611/https://home.treasury.gov/news/press-releases/jy0677 . live .
  17. News: Seoul . Yang Jie in Tokyo and Jiyoung Sohn in . 2022-03-19 . Chip Sanctions Challenge Russia's Tech Ambitions . en-US . . 2022-04-29 . 0099-9660 . 6 November 2022 . https://web.archive.org/web/20221106160707/https://www.wsj.com/articles/chip-sanctions-challenge-russias-tech-ambitions-11647682202 . live .
  18. Web site: Eastwood . Brent M. . 2022-03-31 . Is Russia's Su-75 Checkmate Stealth Fighter Doomed? . 2022-04-29 . 19FortyFive . en-US . 6 November 2022 . https://web.archive.org/web/20221106160707/https://www.19fortyfive.com/2022/03/is-russias-su-75-checkmate-stealth-fighter-doomed/ . live .
  19. Web site: Parachini . John V. . Wilson . Peter A. . 2022-01-06 . Is Russia's Su-75 'Checkmate' Aircraft a Case of Vapor Marketing? . 2022-04-29 . . en . 11 February 2022 . https://web.archive.org/web/20220211185043/https://www.rand.org/blog/2022/01/is-russias-su-75-checkmate-aircraft-a-case-of-vapor.html . live .
  20. Web site: Nigeria is interested in the Su-75, which is in the prototype stage. 30 July 2023. Lenkov. Alexey. bulgarianmilitary.com. 28 July 2023. https://archive.today/20230730121403/https://bulgarianmilitary.com/2023/07/28/nigeria-is-interested-in-the-su-75-which-is-in-the-prototype-stage/. 30 July 2023. live.
  21. Web site: Military Watch Magazine . 2023-11-13 . militarywatchmagazine.com.
  22. Web site: Axe. David. Who's Going To Pay for Russia's Checkmate Stealth Fighter? Probably Not Russia.. 2021-07-22 . 2021-07-30. Forbes. en . https://web.archive.org/web/20210722121740/https://www.forbes.com/sites/davidaxe/2021/07/22/whos-going-to-pay-for-russias-checkmate-stealth-fighter-probably-not-russia/ . 2021-07-22 . live.
  23. Web site: JSF Diverterless Supersonic Inlet. Code One Magazine. 2021-08-05. https://web.archive.org/web/20210805050632/https://www.codeonemagazine.com/article.html?item_id=58. 5 August 2021. live.
  24. Web site: Su-75 turned out to be the most cost-effective fifth-generation machine? How likely is it to be in mass production?. 2021-08-05. iNews.
  25. Web site: 2021-07-19. New Russian Fighter in F-35 Class Echoes Other JSF Designs. 2021-08-05. Air Force Magazine. en-US. 24 July 2021. https://web.archive.org/web/20210724150916/https://www.airforcemag.com/new-russian-fighter-in-f-35-class-echoes-jsf-designs/. live.
  26. Web site: Makichuk. Dave. 2021-07-20. Checkmate: Russia's newest, most advanced fighter jet. 2021-07-30. Asia Times. en-US . https://web.archive.org/web/20210720200337/https://asiatimes.com/2021/07/checkmate-russias-newest-most-advanced-fighter-jet/ . 2021-07-20 . live.
  27. Web site: 2021-07-20. Sukhoi officially Unveils the Checkmate, allegedly codenamed "Screamer" by US Intelligence. 2021-08-05. The Aviation Geek Club. en-GB. 6 November 2022. https://web.archive.org/web/20221106160717/https://theaviationgeekclub.com/sukhoi-officially-unveils-the-checkmate-allegedly-codenamed-screamer-by-us-intelligence/. live.
  28. Web site: Axe. David. Russia's New Fighter Breaks Cover—It's Got 'Stealth' Written All Over It. 2021-08-05. Forbes. en. 18 July 2021. https://web.archive.org/web/20210718224616/https://www.forbes.com/sites/davidaxe/2021/07/18/russias-new-fighter-breaks-cover-its-got-stealth-written-all-over-it/. live.
  29. Web site: Axe. David. Look Closely At Russia's Checkmate Fighter—Its Tail Is One Key To Its Stealth. 2021-07-30. Forbes. en . https://web.archive.org/web/20210720002035/https://www.forbes.com/sites/davidaxe/2021/07/19/look-closely-at-russias-checkmate-fighter-its-tail-is-one-key-to-its-stealth/ . 2021-07-20 . live.
  30. Web site: Šerzad . Timur . July 20, 2021 . ru:Раскрыты характеристики новейшего однодвигательного истребителя «Сухого» . The characteristics of the latest single-engine Sukhoi fighter are revealed . https://tvzvezda.ru/news/20217201539-triew.html . live . https://web.archive.org/web/20210720133636/https://tvzvezda.ru/news/20217201539-triew.html . 20 July 2021 . 29 April 2023 . . ru.
  31. Web site: YouTube. https://web.archive.org/web/20210720205532/https://www.youtube.com/watch?v=Gc2l8xWau60&gl=US&hl=en. dead. 20 July 2021. www.youtube.com.
  32. Web site: Díaz. Pablo. 2021-07-20. Sukhoi Checkmate: An advanced yet affordable match for the F-35 Lightning II. live. https://web.archive.org/web/20210721041958/https://www.aviacionline.com/2021/07/sukhoi-checkmate-an-advanced-yet-affordable-match-for-the-f-35-lightning-ii/. 2021-07-21. 2021-07-20. aviacionline.
  33. Web site: Donald. David. 2021-07-20. New Sukhoi Fighter Design Unveiled at MAKS. live. https://web.archive.org/web/20210720192248/https://www.ainonline.com/aviation-news/defense/2021-07-20/new-sukhoi-fighter-design-unveiled-maks. 2021-07-20. 2021-07-20. AINonline.
  34. Web site: Su-57's new engine not yet available . Meta-Defense.fr . Wolf . Fabrice . 2019-12-09 . 2021-07-30. en . https://web.archive.org/web/20201226205233/https://www.meta-defense.fr/en/2019/12/09/the-new-57-engine-is-not-yet-available/ . 2020-12-26 . live.
  35. Web site: Newdick . Thomas . Rogoway. Tyler . Now We Know Russia's Mysterious New Fighter Is A Single-Engine Design (Updated). 2021-07-16 . 2021-07-30. The Drive. en . https://web.archive.org/web/20210716203939/https://www.thedrive.com/the-war-zone/41576/now-we-know-russias-mysterious-new-fighter-is-a-single-engine-design . 2021-07-16 . live.
  36. News: ru:Чемезов назвал цену нового российского истребителя . Chemezov called the price of the new Russian fighter . https://www.vedomosti.ru/technology/news/2021/07/20/878918-chemezov-nazval-tsenu-novogo-rossiiskogo-istrebitelya . live . https://web.archive.org/web/20211019025855/https://www.vedomosti.ru/technology/news/2021/07/20/878918-chemezov-nazval-tsenu-novogo-rossiiskogo-istrebitelya . 19 October 2021 . 2021-10-19 . Ведомости . ru.
  37. News: 20 July 2021 . ru:Новый российский истребитель Checkmate поднимется в воздух в 2023 году . The new Russian fighter Checkmate will take to the air in 2023 . https://www.vedomosti.ru/business/news/2021/07/20/878934-novii-rossiiskii-istrebitel-checkmate-podnimetsya-v-vozduh-v-2023-godu . live . https://web.archive.org/web/20211019025853/https://www.vedomosti.ru/business/news/2021/07/20/878934-novii-rossiiskii-istrebitel-checkmate-podnimetsya-v-vozduh-v-2023-godu . 19 October 2021 . 19 October 2021 . Ведомости . ru.
  38. Web site: 2005-11-22. The Checkmate aircraft will have no built-in gun for the first time in decades. live. https://web.archive.org/web/20210721132442/https://english.pravda.ru/news/science/71220-checkmate/. 2021-07-21. 2021-07-28. PravdaReport. en.
  39. News: 17 September 2021 . ru:Истребитель Checkmate могут включить в госпрограмму вооружений . Checkmate fighter may be included in the state arms program . https://www.vedomosti.ru/politics/news/2021/09/17/887073-istrebitel-checkmate . live . https://web.archive.org/web/20211019025941/https://www.vedomosti.ru/politics/news/2021/09/17/887073-istrebitel-checkmate . 19 October 2021 . 19 October 2021 . Ведомости . ru.
  40. Web site: Russia to Feature Cutting-Edge Checkmate Fighter Prototype at Dubai Air Show . Indian Defence News . en . 10 November 2021.
  41. News: NBC News. A new arms race? Putin's friend leads Russian effort to sell weapons to U.S. allies. 1 December 2021. 1 December 2021. https://web.archive.org/web/20211201123540/https://www.nbcnews.com/news/world/putins-friend-leads-russian-effort-sell-weapons-us-allies-rcna6599. live.
  42. News: Dangwal . Ashish . Su-75 ‘Checkmate’: Russia Could Invite India To Join The ‘Most Affordable’ Fifth Gen Fighter Jet Project – Reports . The Eurasian Times . 7 February 2023.
  43. Web site: Should India buy Su-75 ‘Checkmate’ and What is the alternative? . Sandhu . Siddhant . SSBCrack . 6 January 2023 .

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