{"id":27072871,"date":"2026-10-07T11:07:25","date_gmt":"2026-10-07T09:07:25","guid":{"rendered":"https:\/\/migflug.com\/afterburner\/x-43a-hyper-x-nasa-scramjet-mach-9-6-record-2004\/"},"modified":"2026-10-07T11:08:16","modified_gmt":"2026-10-07T09:08:16","slug":"x-43a-hyper-x-nasa-scramjet-mach-9-6-record-2004","status":"publish","type":"post","link":"https:\/\/migflug.com\/afterburner\/de\/x-43a-hyper-x-nasa-scramjet-mach-9-6-record-2004\/","title":{"rendered":"X-43A Hyper-X: NASA\u2019s Scramjet That Hit Mach 9.6 in 2004"},"content":{"rendered":"<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style>\n<!-- mfsh:top -->\n\n<style>\n.mfsh-trigger{display:inline-flex;align-items:center;gap:10px;height:44px;padding:0 18px;margin:0 0 26px;border:2px solid #0F1720;background:#fff;color:#0F1720;font-family:inherit;font-size:14px;font-weight:700;line-height:1;letter-spacing:0;text-transform:none;cursor:pointer;box-shadow:none;transition:background .15s,color 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The Pegasus booster lit, climbed to about 110,000 feet and let go. For roughly ten seconds, the 12-foot X-43A breathed air, burned hydrogen and flew at Mach 9.6, close to 7,000 mph according to NASA.<\/p>\n<p>No aircraft powered by an engine that breathes air had ever flown that fast. More than twenty years later, none has officially flown faster. As this week&rsquo;s first <a href=\"https:\/\/migflug.com\/afterburner\/hacm-hypersonic-attack-cruise-missile-first-flight-test-australia-2026\/\">HACM flight test<\/a> shows, the technology the X-43A proved is only now turning into weapons.<\/p>\n\n\n<div style=\"background:#f4f6f9;border-left:4px solid #5C91FF;padding:18px 22px;margin:8px 0 28px\"><p style=\"margin:0 0 10px;font-weight:700;font-size:17px\">Quick Facts<\/p><ul style=\"margin:0;padding-left:20px;line-height:1.75\"><li><strong>Programme:<\/strong> NASA Hyper-X, research started 1996<\/li><li><strong>Vehicle:<\/strong> X-43A, unpiloted, about 12 ft long and 5 ft wide<\/li><li><strong>Engine:<\/strong> Scramjet burning gaseous hydrogen<\/li><li><strong>Flights:<\/strong> June 2001 (failed), 27 March 2004 (Mach 6.8), 16 November 2004 (Mach 9.6)<\/li><li><strong>Launch:<\/strong> Dropped from NASA&rsquo;s B-52B, boosted by a modified Pegasus rocket<\/li><li><strong>Cost:<\/strong> About $230 million over eight years, according to NASA<\/li><\/ul><\/div>\n\n\n<h2 style=\"padding-top:22px\">How Do You Test an Engine That Only Works at Mach 5?<\/h2>\n<p>A scramjet, or supersonic combustion ramjet, has no compressor and no turbine. It relies on the aircraft&rsquo;s own speed to ram air into the engine, where fuel is burned while the airflow is still moving faster than sound. That makes it elegantly simple and, below about Mach 5, completely useless. It cannot start from a standstill.<\/p>\n<p>NASA&rsquo;s answer was brute force. The X-43A rode on the nose of a modified Pegasus rocket, which itself hung under the wing of the agency&rsquo;s veteran B-52B. The bomber carried the stack to around 40,000 feet, the Pegasus boosted it to test speed and altitude, and then the X-43A separated and fired its engine for about ten seconds before gliding into the Pacific. None of the three vehicles was ever meant to be recovered.<\/p>\n\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/10\/x-43a-pegasus-under-nb-52b-wing.jpg\" alt=\"X-43A and its Pegasus booster under the wing of NASA B-52B\" style=\"width:100%;height:auto;max-width:100%;display:block\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">The X-43A and its Pegasus booster under the wing of NASA&rsquo;s B-52B. The bomber also launched the X-15 decades earlier. NASA photo<\/figcaption><\/figure>\n\n<p>NASA&rsquo;s Langley Research Center in Virginia led the programme, with flight testing from Dryden Flight Research Center, now Armstrong, at Edwards Air Force Base. ATK GASL built the vehicles and engines, Boeing Phantom Works supplied the thermal protection and onboard systems, and Orbital Sciences modified the Pegasus boosters.<\/p>\n<h2 style=\"padding-top:22px\">A Failure, Then Two Records<\/h2>\n<p>The first attempt, in June 2001, ended seconds after launch when the Pegasus booster lost control and had to be destroyed. It took almost three years to fix the problems. On 27 March 2004, the second X-43A reached Mach 6.8 at about 95,000 feet, the first time an air-breathing hypersonic engine had powered an aircraft in free flight.<\/p>\n\n<div style=\"background:#f8f9fa;border-left:4px solid #1565c0;padding:20px 22px;margin:18px 0 24px;font-size:16px;line-height:1.7\"><div><em>&ldquo;It was a great mission. It was 90 seconds of terror, but once it&rsquo;s over with, you realize you really accomplished some great things.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Joel Sitz<\/strong> &mdash; X-43A Project Manager, NASA, after the November 2004 flight, as reported by the US Air Force<\/div><\/div><\/div>\n\n<p>The third and final flight on 16 November 2004 was the hardest. At nearly Mach 10, the heating on the leading edges was far more severe, and the margins on everything from inlet geometry to fuel timing were razor thin. It worked. The engine ran for about ten seconds, and the vehicle then glided for close to ten minutes, sending back data before it hit the ocean.<\/p>\n\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/10\/x-43a-model-mach-7-wind-tunnel-langley.jpg\" alt=\"Full-scale X-43A model in a Mach 7 wind tunnel test\" style=\"width:100%;height:auto;max-width:100%;display:block\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">A full-scale X-43A model during a Mach 7 wind tunnel test. Ground testing could only go so far, which is why the programme had to fly. NASA photo<\/figcaption><\/figure>\n\n<h2 style=\"padding-top:22px\">Ten Seconds Worth Years of Data<\/h2>\n<p>For the engineers, ten seconds of engine time was an enormous haul. Ground facilities can only sustain Mach 10 airflow for fractions of a second, so the X-43A&rsquo;s flight produced more real scramjet data at that speed than all previous tests combined.<\/p>\n\n<div style=\"background:#f8f9fa;border-left:4px solid #5C91FF;padding:20px 22px;margin:18px 0 24px;font-size:16px;line-height:1.7\"><div><em>&ldquo;We had 10 seconds&rsquo; fuel on time and 20 seconds of total engine test time data, which dwarfs the amount of data we have been able to collect from all (previous) Mach 10 tests combined.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Randy Voland<\/strong> &mdash; Lead Propulsion Engineer, NASA Langley Research Center, as reported by the US Air Force<\/div><\/div><\/div>\n\n<p>The flight was also a farewell. The B-52B that carried the X-43A had launched X-15s in the 1960s and was retired shortly after the final Hyper-X mission. The commander of the Air Force Flight Test Center, Brig. Gen. Curtis Bedke, said the bomber could claim to have seen and taken part in more aviation history than any other single aircraft.<\/p>\n<h2 style=\"padding-top:22px\">From Research Toy to Weapon<\/h2>\n<p>The X-43A never carried a payload or a pilot, and it was never meant to. Its job was to prove that a scramjet could be started and controlled in real flight at hypersonic speed. The Air Force&rsquo;s X-51A Waverider took the next step a few years later with a hydrocarbon-fuelled engine that ran for minutes rather than seconds. Today, missiles such as HACM are built on what those programmes learned.<\/p>\n<p>NASA&rsquo;s footage of the X-43A launch from the B-52B:<\/p>\n\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/XFb5U7FfvHc\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\n\n\n<p><em>Sources: NASA, US Air Force (af.mil, November 2004), Wikipedia<\/em><\/p>\n\n<!-- mfsh:bottom -->\n\n<button type=\"button\" class=\"mfsh-trigger mfsh-bottom\" data-mfsh-placement=\"bottom\" aria-haspopup=\"dialog\"><svg><use href=\"#mfsh-i-share\"\/><\/svg>Share this story<\/button>\n\n<!-- \/mfsh:bottom -->\n\n\n<style>.mfq{margin:34px 0 8px}.mfq h2{font:26px\/1.3 \"Gilroy semiBold\",Helvetica,Arial,sans-serif;color:#0d1117;padding-top:22px;margin:0 0 6px}.mfq .qa details{border-top:1px solid #5C91FF;margin:0;padding:0}.mfq .qa details:last-of-type{border-bottom:1px solid #e2e7ee}.mfq .qa summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:22px 26px;font:18px\/1.7 \"Gilroy semiBold\",Helvetica,Arial,sans-serif;color:#0d1117}.mfq .qa summary::-webkit-details-marker{display:none}.mfq .qa summary::after{content:\"+\";font:24px Helvetica,sans-serif;color:#3568e0;flex:0 0 auto}.mfq .qa details[open] summary::after{content:\"\\2013\"}.mfq .qa details:hover summary{color:#3568e0}.mfq .qa .a{font:16px\/1.7 \"Gilroy regular\",Helvetica,Arial,sans-serif;color:#454e5e;padding:0 26px 24px}.mfq .qa .a a{color:#3568e0}@media(max-width:680px){.mfq .qa summary{padding:18px 14px;font-size:17px}.mfq .qa .a{padding:0 14px 20px}}<\/style>\n\n\n<section class=\"mfq\"><h2>Frequently Asked Questions<\/h2><div class=\"qa\"><details open><summary>How fast did the X-43A fly?<\/summary><div class=\"a\">NASA\u2019s X-43A reached Mach 9.6 on 16 November 2004, nearly 7,000 mph according to NASA, at about 110,000 feet. It is the fastest speed officially recorded by an aircraft powered by an air-breathing engine.<\/div><\/details><details><summary>What engine did the X-43A use?<\/summary><div class=\"a\">The X-43A used a scramjet, a supersonic combustion ramjet, burning gaseous hydrogen. A scramjet has no moving parts and only works once the vehicle is already travelling at hypersonic speed.<\/div><\/details><details><summary>How was the X-43A launched?<\/summary><div class=\"a\">The X-43A was carried under the wing of NASA\u2019s B-52B on the nose of a modified Pegasus booster rocket. After release, the Pegasus accelerated it to test speed, then the X-43A separated and fired its scramjet.<\/div><\/details><details><summary>How many X-43A flights were there?<\/summary><div class=\"a\">NASA flew three X-43A vehicles. The first, in June 2001, failed when the Pegasus booster lost control. The second reached Mach 6.8 on 27 March 2004, and the third reached Mach 9.6 on 16 November 2004.<\/div><\/details><details><summary>How long did the X-43A scramjet run?<\/summary><div class=\"a\">On each successful flight the X-43A\u2019s scramjet ran for about ten seconds. The vehicle then glided for close to ten minutes, transmitting data before falling into the Pacific Ocean.<\/div><\/details><details><summary>How much did the X-43A programme cost?<\/summary><div class=\"a\">NASA puts the cost of the Hyper-X programme at about $230 million over eight years, covering three vehicles, their engines and the modified Pegasus boosters.<\/div><\/details><details><summary>Was the X-43A recovered after its flights?<\/summary><div class=\"a\">No. None of the three X-43A vehicles was designed to be recovered. Each one crashed into the Pacific Ocean at the end of its flight, as planned.<\/div><\/details><\/div><\/section>\n\n\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"How fast did the X-43A fly?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"NASA\u2019s X-43A reached Mach 9.6 on 16 November 2004, nearly 7,000 mph according to NASA, at about 110,000 feet. It is the fastest speed officially recorded by an aircraft powered by an air-breathing engine.\"}},{\"@type\":\"Question\",\"name\":\"What engine did the X-43A use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The X-43A used a scramjet, a supersonic combustion ramjet, burning gaseous hydrogen. 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Each one crashed into the Pacific Ocean at the end of its flight, as planned.\"}}]}<\/script><div style=\"background:#f0f4ff;border-left:4px solid #5C91FF;padding:16px 20px;margin:32px 0 8px\"><p style=\"margin:0 0 8px;font-weight:600;color:#333\">Related Posts<\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/hacm-hypersonic-attack-cruise-missile-first-flight-test-australia-2026\/\">HACM Hypersonic Missile Flies for the First Time Over Australia<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/mach-6-7-at-the-edge-of-space-the-x-15-story\/\">Mach 6.7 at the Edge of Space: The X-15 Story<\/a><\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>In November 2004 NASA\u2019s unpiloted X-43A flew at Mach 9.6 on scramjet power, still the record for an air-breathing aircraft.<\/p>","protected":false},"author":23,"featured_media":27072291,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[666,664],"tags":[],"class_list":["post-27072871","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-history-and-legends","category-military-aviation"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>X-43A Hyper-X: NASA Scramjet Hits Mach 9.6 | MiGFlug<\/title>\n<meta name=\"description\" content=\"The X-43A flew at Mach 9.6 on scramjet power in November 2004, still the record for an air-breathing aircraft. 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The mission originated from the NASA Dryden Flight Research Center at Edwards Air Force Base, Calif. Minutes later the X-43A separated from the Pegasus booster and accelerated to its intended speed of Mach 7. In a combined research effort involving Dryden, Langley, and several industry partners, NASA demonstrated the value of its X-43A hypersonic research aircraft, as it became the first air-breathing, unpiloted, scramjet-powered plane to fly freely by itself. The March 27 flight, originating from NASA's Dryden Flight Research Center, began with the Agency's B-52B launch aircraft carrying the X-43A out to the test range over the Pacific Ocean off the California coast. The X-43A was boosted up to its test altitude of about 95,000 feet, where it separated from its modified Pegasus booster and flew freely under its own power. Two very significant aviation milestones occurred during this test flight: first, controlled accelerating flight at Mach 7 under scramjet power, and second, the successful stage separation at high dynamic pressure of two non-axisymmetric vehicles. To top it all off, the flight resulted in the setting of a new aeronautical speed record. 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