Vulcan (roket): Perbedaan antara revisi
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Pada akhir 2017, diputuskan bahwa Vulcan akan menggunakan Centaur V sebagai tahap atas dan keseluruhan roket peluncur dinamai Vulcan Centaur.<ref name="sn20180325"/> Dengan konfigurasi seperti ini, Vulcan Centaur tanpa SRB memiliki kemampuan untuk meluncurkan muatan "30% lebih berat" daripada yang dapat diluncurkan oleh Delta IV Heavy.<ref>{{Cite web|url=https://www.reddit.com/r/ula/comments/7wxhqc/vulcan_heavy/du4wrv4/|title=Vulcan Heavy?|last=ToryBruno (President & CEO of ULA)|date=|website=Reddit.com|access-date=2018-04-12}}</ref>
Pada Mei 2018, ULA memilih mesin RL10 produksi Aerojet Rocketdyne untuk tahap atas Vulcan Centaur.<ref>{{Cite web|url=http://www.orlandosentinel.com/news/space/go-for-launch/os-united-launch-alliance-rocket-aerodyne-vulcan-20180511-story.html|title=ULA chooses Aerojet Rocketdyne over Blue Origin for Vulcan's upper stage engine|last=Tribou|first=Richard|date=May 11, 2018|website=Orlando Sentinel|access-date=May 13, 2018|archive-date=2018-05-13|archive-url=https://web.archive.org/web/20180513060411/http://www.orlandosentinel.com/news/space/go-for-launch/os-united-launch-alliance-rocket-aerodyne-vulcan-20180511-story.html|dead-url=yes}}</ref> Pada September 2018, ULA mengumumkan pemilihan mesin BE-4 produksi Blue Origin untuk bagian pendorong Vulcan.<ref name="ULA20180927">{{Cite press release|title=United Launch Alliance Building Rocket of the Future with Industry-Leading Strategic Partnerships – ULA Selects Blue Origin Advanced Booster Engine for Vulcan Centaur Rocket System|language=Bahasa Inggris|publisher=United Launch Alliance|date=27 September 2018|url=https://www.ulalaunch.com/about/news/2018/09/27/united-launch-alliance-building-rocket-of-the-future-with-industry-leading-strategic-partnerships}}</ref><ref>{{Cite news|url=https://www.reuters.com/article/us-blue-origin-ula/jeff-bezos-blue-origin-to-supply-engines-for-vulcan-rocket-idUSKCN1M70UM|title=Jeff Bezos' Blue Origin to supply engines for Vulcan rocket|agency=[[Reuters]]|first=Eric M.|last=Johnson|first2=Joey|last2=Roulette|date=September 27, 2018|access-date=September 28, 2018}}</ref>
Pada Oktober 2018, USAF merilis persyaratan tambahan untuk kontraktor program NSSL. Hal ini menyebabkan ditundanya peluncuran awal Vulcan hingga April 2021 dari yang sebelumnya direncanakan pada tahun 2020.<ref name="sn20181025">{{Cite news|url=https://spacenews.com/ula-now-planning-first-launch-of-vulcan-in-2021/|title=ULA now planning first launch of Vulcan in 2021|work=[[SpaceNews]]|first=Jeff|last=Foust|date=October 25, 2018|access-date=November 11, 2018}}{{Pranala mati|date=September 2021 |bot=InternetArchiveBot |fix-attempted=yes }}</ref><ref name="SpaceNewsFoust201801">{{Cite tweet|number=954054070821670912|user=jeff_foust|date=18 January 2018|title=Tom Tshudy, ULA: with Vulcan we plan to maintain reliability and on-time performance of our existing rockets, but at a very affordable price. First launch mid-2020.}}</ref><ref>Foust, Jeff. [https://spacenews.com/ula-now-planning-first-launch-of-vulcan-in-2021/ "ULA now planning first launch of Vulcan in 2021"]{{Pranala mati|date=September 2021 |bot=InternetArchiveBot |fix-attempted=yes }}. Space News, October 25, 2018.</ref>
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