Editing Geosynchronous Satellite Launch Vehicle (section)

=== Liquid boosters ===
The first GSLV flight, GSLV-D1 used the L40 stage. Subsequent flights of the GSLV used high pressure engines in the strap-on boosters called the L40H.<ref name=isroGSLVD2>{{cite web|title=GSLV-D2
|url=http://isro.gov.in/gslv-d2/gslv-d2.aspx|publisher=ISRO|access-date=15 December 2013|url-status=dead|archive-url=https://web.archive.org/web/20130809215736/http://isro.gov.in/gslv-d2/gslv-d2.aspx|archive-date=9 August 2013}}</ref> The GSLV uses four L40H [[Liquid rocket booster|liquid strap-on boosters]] derived from the L37.5 second stage, which are loaded with 42.6 tons of [[hypergolic]] propellants ([[Unsymmetrical dimethylhydrazine|UDMH]] and [[Dinitrogen tetroxide|N<sub>2</sub>O<sub>4</sub>]]). The propellants are stored in tandem in two independent tanks {{cvt|2.1|m}} diameter. The engine is [[Pump-fed engine|pump-fed]] and generates {{cvt|760|kN}} of thrust, with a burn time of 150 seconds.