{"id":23740,"date":"2025-08-12T22:39:12","date_gmt":"2025-08-12T14:39:12","guid":{"rendered":"https:\/\/wp-productionenv-bjg9h2g2bgg5b8aa.southeastasia-01.azurewebsites.net\/news\/b1091-a-heavy-core-in-falcon-9-clothing\/"},"modified":"2026-07-16T18:01:49","modified_gmt":"2026-07-16T10:01:49","slug":"b1091-a-heavy-core-in-falcon-9-clothing","status":"publish","type":"post","link":"https:\/\/starpath.global\/news\/b1091-a-heavy-core-in-falcon-9-clothing\/","title":{"rendered":"B1091 \u201cA Heavy Core in Falcon 9 Clothing\u201d"},"content":{"rendered":"<p>SpaceX\u2019s recent launch involved another successful landing of its Falcon 9 booster, but this time marked a Falcon Heavy center core booster launching and landing as a single-stick Falcon 9 rocket.<\/p>\n<p>The booster, designated B1091, powered the KF-02 mission, deploying 24 satellites for Amazon\u2019s Project Kuiper broadband constellation into low Earth orbit. This event marks a technical first for the company, blending elements of its Falcon 9 and Falcon Heavy programs.\n<\/p>\n<\/p>\n<p><iframe title=\"What's Wrong With This Picture? Falcon Heavy in Disguise!\" src=\"https:\/\/www.youtube.com\/embed\/nSLFAVP_jSM?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen=\"\" name=\"fitvid0\" data-gtm-yt-inspected-14=\"true\" data-gtm-yt-inspected-21=\"true\"><\/iframe><\/p>\n<p>The launch occurred on August 11, 2025, at 8:35 a.m. ET from Space Launch Complex 40 (SLC-40) at Cape Canaveral Space Force Station. Approximately eight minutes after liftoff, B1091 executed a precise landing on the drone ship A Shortfall of Gravitas stationed in the Atlantic Ocean.<\/p>\n<p>At first glance, the launch appeared to be a standard Falcon 9 mission. However, B1091 is no ordinary booster. As revealed by SpaceX Vice President of Falcon and Dragon, Jon Edwards, in a May 2025 post on X, B1091 was originally built as a Falcon Heavy center core.<\/p>\n<p><iframe id=\"twitter-widget-1\" scrolling=\"no\" frameborder=\"0\" allowtransparency=\"true\" allowfullscreen=\"true\" class=\"\" style=\"position: absolute; visibility: hidden; width: 0px; height: 0px; display: block; flex-grow: 1;\" title=\"X Post\" src=\"https:\/\/platform.twitter.com\/embed\/Tweet.html?creatorScreenName=NASASpaceflight&amp;dnt=true&amp;embedId=twitter-widget-1&amp;features=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%3D%3D&amp;frame=false&amp;hideCard=false&amp;hideThread=false&amp;id=1920258572254130206&amp;lang=en&amp;origin=https%3A%2F%2Fwww.nasaspaceflight.com%2F2025%2F08%2Fb1091-heavy-core-falcon-9-clothing%2F&amp;sessionId=368c9465c6223de2505655f4430584a2f2074151&amp;siteScreenName=NASASpaceflight&amp;theme=light&amp;widgetsVersion=6a3ad42b224df%3A1778106238597&amp;width=550px\" data-gtm-yt-inspected-14=\"true\" data-gtm-yt-inspected-21=\"true\" data-tweet-id=\"1920258572254130206\"><\/iframe><\/p>\n<blockquote class=\"twitter-tweet\" data-width=\"550\" data-dnt=\"true\" data-twitter-extracted-i1783493561855163207=\"true\">\n<p lang=\"en\" dir=\"ltr\">B1091 is in fact a Falcon Heavy center core that will fly in a single stick configuration a handful of times before being reconfigured and flying as a Falcon Heavy. This way we get some use out of it while the Heavy customer finishes up the payload while also reducing risk as it\u2026<\/p>\n<p>\u2014 Jon Edwards (@edwards345) May 7, 2025<\/p>\n<\/blockquote>\n<p>\u201cB1091 is in fact a Falcon Heavy center core that will fly in a single stick configuration a handful of times before being reconfigured and flying as a Falcon Heavy,\u201d Edwards stated. \u201cThis way we get some use out of it while the Heavy customer finishes up the payload while also reducing risk as it will be flight proven.\u201d<\/p>\n<p>Falcon Heavy center cores differ significantly from standard Falcon 9 boosters. Designed to withstand the intense stresses of being flanked by two side boosters, center cores feature thicker tank walls, additional structural supports, and reinforced attachment points.<\/p>\n<p>SpaceX<path d=\"M7.59009 18.59L9.00009 20L17.0001 12L9.00009 4L7.59009 5.41L14.1701 12\" style=\"animation: initial !important; background: initial !important; border: 0px !important; box-shadow: none !important; color: inherit !important; cursor: inherit !important; direction: inherit !important; display: inline !important; fill: currentcolor !important; filter: initial !important; float: none !important; margin: 0px !important; opacity: initial !important; outline: 0px !important; overflow: initial !important; padding: 0px !important; stroke: initial !important; transform: initial !important; vertical-align: initial !important; visibility: inherit !important;\"><\/path>NASA educational resources<path d=\"M7.59009 18.59L9.00009 20L17.0001 12L9.00009 4L7.59009 5.41L14.1701 12\" style=\"animation: initial !important; background: initial !important; border: 0px !important; box-shadow: none !important; color: inherit !important; cursor: inherit !important; direction: inherit !important; display: inline !important; fill: currentcolor !important; filter: initial !important; float: none !important; margin: 0px !important; opacity: initial !important; outline: 0px !important; overflow: initial !important; padding: 0px !important; stroke: initial !important; transform: initial !important; vertical-align: initial !important; visibility: inherit !important;\"><\/path>NASA mission patches<path d=\"M7.59009 18.59L9.00009 20L17.0001 12L9.00009 4L7.59009 5.41L14.1701 12\" style=\"animation: initial !important; background: initial !important; border: 0px !important; box-shadow: none !important; color: inherit !important; cursor: inherit !important; direction: inherit !important; display: inline !important; fill: currentcolor !important; filter: initial !important; float: none !important; margin: 0px !important; opacity: initial !important; outline: 0px !important; overflow: initial !important; padding: 0px !important; stroke: initial !important; transform: initial !important; vertical-align: initial !important; visibility: inherit !important;\"><\/path>\n<p>     (adsbygoogle = window.adsbygoogle || []).push({});<\/p>\n<p>These enhancements allow them to handle triple the forces from 27 Merlin engines firing simultaneously\u2014far beyond what a single Falcon 9 experiences.<\/p>\n<p>In contrast, Falcon Heavy side boosters are nearly identical to Falcon 9 cores, requiring only minor integration hardware and aerodynamic nosecones.<\/p>\n<p>All boosters utilize an \u201cOctaweb\u201d engine mounting structure for nine Merlin 1D engines, but B1091-as with all other Falcon Heavy Center Cores\u2019-featured additional hardware to allow the mounting of the two side boosters.<\/p>\n<p>SpaceX has repurposed Falcon Heavy side boosters for Falcon 9 missions in the past, including the inaugural Falcon Heavy flight in 2018, which used boosters previously flown as Falcon 9s.<br \/>\n<img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-108680\" src=\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2025\/08\/NSF-2025-08-12-22-26-44-616.jpg\" alt=\"\" width=\"1526\" height=\"848\" srcset=\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2025\/08\/NSF-2025-08-12-22-26-44-616.jpg 1526w, https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2025\/08\/NSF-2025-08-12-22-26-44-616-350x194.jpg 350w, https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2025\/08\/NSF-2025-08-12-22-26-44-616-630x350.jpg 630w, https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2025\/08\/NSF-2025-08-12-22-26-44-616-768x427.jpg 768w, https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2025\/08\/NSF-2025-08-12-22-26-44-616-1170x650.jpg 1170w\" sizes=\"(max-width: 1526px) 100vw, 1526px\">The primary deterrent has been the added mass from reinforcements, estimated at 10-20% more than a standard Falcon 9 booster. This extra weight reduces fuel efficiency and payload capacity by several tons, making it an issue for most Falcon 9 missions where maximizing orbit delivery is key.<\/p>\n<p>Historically, center cores were either expended on high-energy Heavy launches or held in reserve. Converting one for single-stick use involves modifications to remove or adapt attachment hardware, but the performance penalty had previously outweighed the benefits.<\/p>\n<p>In B1091\u2019s case, SpaceX opted for this approach to utilize the booster while awaiting a delayed Heavy payload, simultaneously flight-proving it for future missions.<\/p>\n<p><iframe id=\"twitter-widget-2\" scrolling=\"no\" frameborder=\"0\" allowtransparency=\"true\" allowfullscreen=\"true\" class=\"\" style=\"position: absolute; visibility: hidden; width: 0px; height: 0px; display: block; flex-grow: 1;\" title=\"X Post\" src=\"https:\/\/platform.twitter.com\/embed\/Tweet.html?creatorScreenName=NASASpaceflight&amp;dnt=true&amp;embedId=twitter-widget-2&amp;features=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%3D%3D&amp;frame=false&amp;hideCard=false&amp;hideThread=false&amp;id=1954890385232409083&amp;lang=en&amp;origin=https%3A%2F%2Fwww.nasaspaceflight.com%2F2025%2F08%2Fb1091-heavy-core-falcon-9-clothing%2F&amp;sessionId=368c9465c6223de2505655f4430584a2f2074151&amp;siteScreenName=NASASpaceflight&amp;theme=light&amp;widgetsVersion=6a3ad42b224df%3A1778106238597&amp;width=550px\" data-gtm-yt-inspected-14=\"true\" data-gtm-yt-inspected-21=\"true\" data-tweet-id=\"1954890385232409083\"><\/iframe><\/p>\n<blockquote class=\"twitter-tweet\" data-width=\"550\" data-dnt=\"true\" data-twitter-extracted-i1783493561855163207=\"true\">\n<p lang=\"en\" dir=\"ltr\">The best type of condensation, courtesy of @dwisecinema https:\/\/t.co\/vY1zVG6kQd pic.twitter.com\/o5uGqEPJpH<\/p>\n<p>\u2014 NSF \u2013 NASASpaceflight.com (@NASASpaceflight) August 11, 2025<\/p>\n<\/blockquote>\n<p>During its return, observers noticed evidence of the booster\u2019s heavier build during the KF-02 landing.<\/p>\n<p>The entry burn began at a higher altitude\u2014approximately 4.1 km\u2014compared to typical Falcon 9 missions (around 3.2 km), suggesting a longer burn was needed to decelerate the denser core.<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-108679\" src=\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2025\/08\/NSF-2025-08-12-22-22-36-570.jpg\" alt=\"\" width=\"1526\" height=\"847\" srcset=\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2025\/08\/NSF-2025-08-12-22-22-36-570.jpg 1526w, https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2025\/08\/NSF-2025-08-12-22-22-36-570-350x194.jpg 350w, https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2025\/08\/NSF-2025-08-12-22-22-36-570-630x350.jpg 630w, https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2025\/08\/NSF-2025-08-12-22-22-36-570-768x426.jpg 768w, https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2025\/08\/NSF-2025-08-12-22-22-36-570-1170x649.jpg 1170w\" sizes=\"(max-width: 1526px) 100vw, 1526px\">For SpaceX, this innovation demonstrates the versatility of its reusable rocket ecosystem, potentially reducing costs and risks by maximizing hardware utilization. The KF-02 mission itself advances Amazon\u2019s Project Kuiper, pushing the constellation past 100 satellites and closer to providing global broadband coverage.<\/p>\n<p>Ironically, Project Kuiper is seen as a rival to SpaceX\u2019s own Starlink constellation, but SpaceX is happy to take Amazon\u2019s launch contract money with confidence that Starlink is vastly ahead of its rival.<\/p>\n<p>This flight could pave the way for more hybrid uses of its boosters, complementing its fleet-leading vehicles, with B1067 soon to launch its 30th mission, all while the company prepares its superior Starship program for operational flights.<\/p>\n<p><em>Lead image: Ben Cooper for SpaceX<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-108677\" src=\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2025\/08\/Launch-Entry-Landing_Forum-Ad_1.png\" alt=\"\" width=\"1600\" height=\"320\" srcset=\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2025\/08\/Launch-Entry-Landing_Forum-Ad_1.png 1600w, https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2025\/08\/Launch-Entry-Landing_Forum-Ad_1-350x70.png 350w, https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2025\/08\/Launch-Entry-Landing_Forum-Ad_1-630x126.png 630w, https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2025\/08\/Launch-Entry-Landing_Forum-Ad_1-768x154.png 768w, https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2025\/08\/Launch-Entry-Landing_Forum-Ad_1-1170x234.png 1170w\" sizes=\"(max-width: 1600px) 100vw, 1600px\"><br \/>\n<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>SpaceX\u2019s recent launch involved another successful landing of its Falcon 9 booster, but this time marked a Falcon Heavy center core booster launching and landing as a single-stick Falcon 9 rocket. The booster, designated B1091, powered the KF-02 mission, deploying 24 satellites for Amazon\u2019s Project Kuiper broadband constellation into low Earth orbit. This event marks [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":33230,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[2],"tags":[479,678,316],"class_list":["post-23740","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-falcon-9","tag-falcon-heavy","tag-spacex"],"acf":[],"_links":{"self":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/23740"}],"collection":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/comments?post=23740"}],"version-history":[{"count":1,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/23740\/revisions"}],"predecessor-version":[{"id":32790,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/23740\/revisions\/32790"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/media\/33230"}],"wp:attachment":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/media?parent=23740"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/categories?post=23740"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/tags?post=23740"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}