Editing Apollo Lunar Module (section)

===Extended J-class missions===
[[File:Apollo 15 Engine Bell.jpg|thumb|right|Decreased clearance led to buckling of the extended descent engine nozzle on the landing of [[Apollo 15]].]]
The Extended Lunar Module (ELM) used on the final three [[List of Apollo missions#Alphabetical mission types|"J-class missions"]]—[[Apollo 15]], [[Apollo 16|16]], and [[Apollo 17|17]]—was upgraded. The descent engine thrust was increased by the addition of a {{convert|10|in|mm|adj=on}} extension to the [[Bell nozzle|engine bell]], and the descent propellant tanks were enlarged. A waste storage tank was added to the descent stage, with plumbing from the ascent stage. These upgrades allowed stays of up to 75 hours on the Moon.<ref name=":4">{{Cite web |last=Salamé Páez |first=Ricardo |title=Building LM-11: Apollo 16's Orion |url=https://www.ninfinger.org/models/LM-11/LunarModuleOrion.html}}</ref> The [[Lunar Roving Vehicle]] was folded up and carried in Quadrant 1 of the descent stage. It was deployed by the astronauts after landing.<ref name=":4" />