This new nozzle extension is shorter and, as a result, decreasing both performance and material usage but with this nozzle, the MVac engine produces 10% less thrust in space. Transporter-7 mission launch debuted a new MVac nozzle extension design or variant aimed at increasing cadence and reducing costs. Based on mission requirements, they are Medium Coast & Long Coast kits, i.e., the number of helium bottles for pressurization and added batteries for power and other hardware to make sure that the fuel and stages systems operate as long as needed. The upgrades afforded the second stage with the endurance needed to inject the payloads directly into geosynchronous or high energy orbit where the second stage needs hours after launch. SpaceX CRS-18 featured a Falcon mission-extension kit to the standard second stage, which equipped the second stage with a dark-painted band (for thermal control), extra COPVs for pressurization control, and additional TEA-TEB ignition fluid. Later Block 5 boosters are also easier to prepare for flight, so SpaceX "prefer to retire" older cores by assigning them to expendable missions when possible. To improve the rocket's performance, SpaceX has tweaked throttle settings and separation timings. The first booster with COPV2 tanks was booster B1047 on the Es'hail 2 mission on November 15, 2018, and the second booster using the COPV2 tanks was CRS-16/ B1050, which had its first launch on December 5, 2018. Among other changes, the initial Block 5 boosters did not have the redesigned composite overwrapped pressure vessel (COPV2) tanks. Since the debut of Block 5, SpaceX has continued to iterate on its design, manufacturing processes, and operational procedures. the Octaweb structure is bolted together instead of welded, reducing manufacturing time.a set of retractable landing legs for rapid recovery and shipping.
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