# GSLV The Geosynchronous Satellite Launch Vehicle (GSLV) is the rocket the Indian Space Research Organisation (ISRO) uses to put satellites into high orbits — the 36,000-kilometer belt where communications, weather and navigation satellites sit over one spot on Earth. It first flew in April 2001. Its story is less about the rocket than about the engine on top of it, and about what happened when the United States tried to stop [[India]] from getting that engine. ## The engine Washington tried to block Reaching high orbit efficiently needs a cryogenic upper stage — an engine burning super-cold liquid hydrogen and liquid oxygen. In 1991 India signed a deal with the Soviet (then Russian) agency Glavkosmos to buy cryogenic engines and the technology to build them. In 1992 the George H.W. Bush administration sanctioned both ISRO and Glavkosmos under the Missile Technology Control Regime, arguing that the know-how could help a missile program. Under American pressure, Russia sold India a handful of finished engines but not the technology. So India built its own. Early GSLVs flew on Russian-supplied engines. The first flight with an Indian-built cryogenic stage failed in April 2010. The second attempt succeeded in January 2014 — more than two decades after the sanctions. The episode is a textbook case of a pattern this wiki tracks across semiconductors, AI and space: **technology denial slowed a rival down, then made it self-sufficient.** ## A troubled record, then a run of wins The GSLV earned a reputation for unreliability. It failed twice in 2010 alone, and in August 2021 the GSLV-F10 mission was lost when its cryogenic stage malfunctioned, taking the GISAT-1 Earth-imaging satellite with it. The more recent record is better: - **GSLV-F15 (29 January 2025)** — ISRO's 100th launch from its Sriharikota spaceport, carrying the NVS-02 navigation satellite for NavIC, India's regional GPS alternative. The rocket did its job; the satellite later could not raise itself to its final orbit because of a problem on the satellite side. - **GSLV-F16 (30 July 2025)** — launched NISAR, the first Earth-observation satellite built jointly by [[NASA]] and ISRO. It went up the same day [[Donald Trump]] announced a 25 percent tariff on Indian goods. Space cooperation and trade policy were pointing in opposite directions. - **GSLV-F17 (4 September 2026)** — the 19th GSLV mission, carrying EOS-05 (also called GISAT-1A), India's first dedicated imaging satellite in geosynchronous orbit. At 2,367 kg it was the heaviest payload a GSLV has carried, and it replaced the satellite lost in 2021. It was ISRO's first launch in nearly eight months, after a PSLV rocket failed in January 2026. ## Not to be confused with LVM3 India's heavier rocket, LVM3, was originally named "GSLV Mk III," which still causes confusion. It is a different design. LVM3 launched the Chandrayaan-3 Moon landing in 2023 and is the rocket meant to carry India's first astronauts under the Gaganyaan program. The GSLV on this page is the older, lighter vehicle, sometimes labeled GSLV Mk II. ## Why it's on the map The GSLV matters for two reasons. First, it is the cleanest case study of what American export controls actually do over a long time horizon: the 1992 sanctions bought Washington roughly twenty years and left India with a fully domestic capability it does not owe anyone for. That history belongs in every debate about chip and AI export controls aimed at China. Second, India's space program is now a pillar of [[Narendra Modi]]'s national-prestige politics and of the U.S.-India partnership the [[Quadrilateral Security Dialogue]] is built around — a partnership that, as the NISAR launch-day tariff showed, Washington can strain without meaning to. ## See also - [[SSLV]] — India's small-satellite rocket - [[India]] — the country - [[Space Launch Infrastructure]] — launch as a strategic chokepoint - [[Chinese Space Program Hub]] — the other Asian program shaped by U.S. technology denial - [[Ariane]] · [[H3 Rocket]] · [[Long March Rockets]] — the other national launchers - [[Space Hub]] — the parent hub