Editing SpaceX Merlin (section)

====Merlin 1D Vacuum improvements and variants====
Transporter-7 mission launch debuted a new Merlin Vacuum engine (MVac for short) nozzle extension design or variant aimed at increasing cadence and reducing costs. This new nozzle extension is shorter and, as a result, decreases both performance and material usage. This nozzle is only used on lower-performance missions, as with this nozzle, the MVac engine produces 10% less thrust in space. The nozzle decreases the amount of material needed by 75%; this means that SpaceX can launch over three times as many missions with the same amount of rare [[niobium]] metal as with the longer design.<ref name=TR7>{{cite web |url=https://nextspaceflight.com/launches/details/6808 |title=Transporter 7 |access-date=March 17, 2023}}</ref><ref name=":0">{{Cite web |last=Sesnic |first=Trevor |date=July 22, 2023 |title=EchoStar 24 {{!}} Falcon Heavy |url=https://everydayastronaut.com/echostar-24-falcon-heavy/ |access-date=July 29, 2023 |website=Everyday Astronaut |language=en-US}}</ref>