Editing Longeron (section)

== Space launch vehicles ==
Stringers are also used in the construction of some [[launch vehicle]] [[propellant]] tanks. For example, the [[Falcon 9 Full Thrust|Falcon 9]]<!-- the sxFpug20151021 source is specific to the newer (late 2015 and after) version of the Falcon 9 vehicle; I would imagine, but don't have a source, that earlier F9s did the same and used stringers as well. --> launch vehicle uses stringers in the [[RP-1|kerosene (RP-1)]] tanks, but not in the [[Liquid Oxygen|liquid oxygen]] tanks, on both the first and second stages.<ref name=sxf9pug20151021>{{cite web |title=Falcon 9 Launch Vehicle Payload User's Guide, Rev 2 |page=11 |url=http://www.spacex.com/sites/spacex/files/falcon_9_users_guide_rev_2.0.pdf |access-date=29 January 2016 |date=21 October 2015 |archive-url=https://web.archive.org/web/20170314002928/http://www.spacex.com/sites/spacex/files/falcon_9_users_guide_rev_2.0.pdf |archive-date=14 March 2017 |url-status=dead }}</ref>