Editing Polar Satellite Launch Vehicle (section)

=== Second stage (PS2) ===
[[File:PSLV C50 second stage with Vikas engine.jpg|left|thumb|250x250px|PSLV-C50 second stage with [[VIKAS engine|Vikas engine]]]]

The second stage is powered by a single [[Vikas (rocket engine)|Vikas engine]] and carries {{cvt|41.5|MT}} of [[Earth]] store-able liquid propellant{{spaced ndash}}[[unsymmetrical dimethylhydrazine]] (UDMH) as fuel and [[nitrogen tetroxide]] (N<sub>2</sub>O<sub>4</sub>) as oxidiser in two tanks separated by a common bulkhead.<ref name=":4"/> It generates a maximum thrust of {{cvt|800|kN}}. The engine is [[gimbal]]ed (±4°) in two planes to provide pitch and yaw control by two actuators, while roll control is provided by a Hot gas Reaction Control Motor (HRCM) that ejects hot gases diverted from gas generator of Vikas engine.<ref>{{cite web|url=https://www.isro.gov.in/sites/default/files/flipping_book/10-Space_India-1_1990/files/assets/basic-html/page-7.html|title=Space India 1/1990|website=isro.gov.in|access-date=22 February 2020|archive-date=6 August 2020|archive-url=https://web.archive.org/web/20200806054903/https://www.isro.gov.in/sites/default/files/flipping_book/10-Space_India-1_1990/files/assets/basic-html/page-7.html|url-status=live}}</ref>

On inter-stage (1/2U) of PS2, there are two pairs of ullage rockets to maintain positive acceleration during PS1/PS2 staging and also two pairs of retro-rockets to help push away spent stage during PS2/PS3 staging.<ref name=":5"/>

Second stage also carries some quantity of water in a [[toroid]]al tank at its bottom.<ref name=":6">{{cite web|url=https://www.isro.gov.in/sites/default/files/flipping_book/PSLV-C8/files/assets/common/downloads/publication.pdf|url-status=dead|title=PSLV C8 / AGILE brochure|access-date=23 February 2020|archive-date=23 February 2020|archive-url=https://web.archive.org/web/20200223011646/https://www.isro.gov.in/sites/default/files/flipping_book/PSLV-C8/files/assets/common/downloads/publication.pdf}}</ref> Water spray is used to cool hot gases from Vikas' gas generator to about 600&nbsp;°C before entering turbopump. Propellant and water tanks of second stage are pressurized by [[Helium]].<ref>{{Cite journal |title=Development & qualification of Titanium Alloy High-Pressure Gas Bottles for PSLV second Stage |url=http://adsabs.harvard.edu/full/1999ESASP.430..559T |url-status=live |access-date=2021-04-07 |journal=Cooperation in Space |bibcode=1999ESASP.430..559T |last1=Thomas |first1=George |last2=Pant |first2=Bhanu |last3=Ganesan |first3=R. |last4=Singh |first4=S. K. |last5=Sinha |first5=P. P. |year=1999 |volume=430 |page=559 |archive-date=11 November 2020 |archive-url=https://web.archive.org/web/20201111223537/http://adsabs.harvard.edu/full/1999ESASP.430..559T }}</ref><ref>{{cite book |title=Envisioning An Empowered nation|isbn=978-0070531543|page=40|last=Sivathanu Pillai|first=A.|year=2004|publisher=Tata McGraw-Hill Publishing Company }}</ref><ref>{{Cite web|date=April 1990|title=Space India Jan-Mar 1990|url=https://www.isro.gov.in/sites/default/files/flipping_book/10-Space_India-1_1990/files/assets/common/downloads/publication.pdf|url-status=live|archive-url=https://web.archive.org/web/20210407195425/https://www.isro.gov.in/sites/default/files/flipping_book/10-Space_India-1_1990/files/assets/common/downloads/publication.pdf|archive-date=7 April 2021|access-date=8 April 2021}}</ref>