{"id":21455474,"date":"2026-09-10T10:16:19","date_gmt":"2026-09-10T08:16:19","guid":{"rendered":"https:\/\/migflug.com\/afterburner\/hermeus-ramjet-x-quarterhorse-air-launched-2026\/"},"modified":"2026-09-10T10:16:50","modified_gmt":"2026-09-10T08:16:50","slug":"hermeus-ramjet-x-quarterhorse-air-launched-2026","status":"publish","type":"post","link":"https:\/\/migflug.com\/afterburner\/fr\/hermeus-ramjet-x-quarterhorse-air-launched-2026\/","title":{"rendered":"Hermeus Ramjet-X: A Ramjet Dropped From a Drone at Mach 3"},"content":{"rendered":"\r\n<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">A ramjet has no moving parts and no way of starting itself. It works by ramming air into a duct so fast that the compression alone is enough to burn fuel usefully, which means that at zero knots on a runway it is an expensively shaped tube of nothing. Something else has to get it moving first.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">For seventy years that something has usually been a rocket booster, thrown away on every single test. On 9 September 2026, the Atlanta company Hermeus unveiled its answer to that bill: Ramjet-X, an expendable ramjet vehicle that is carried to Mach 3 under the wing of a reusable drone, dropped, and left to accelerate on its own while the mothership flies home to collect the next one.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">If the shape looks familiar to anyone who has spent time reading about the Blackbird family, that is not a coincidence.<\/p>\r\n\r\n\r\n\r\n<div style=\"background:#f5f5f5;padding:20px 24px;margin:26px 0\"><p style=\"margin:0 0 12px;font-weight:700;font-size:17px;color:#0d1117\">Quick Facts<\/p><table style=\"width:100%;border-collapse:collapse;font-size:15px;line-height:1.6\"><tr><td style=\"padding:5px 12px 5px 0;color:#555;vertical-align:top;white-space:nowrap\"><strong>Vehicle<\/strong><\/td><td style=\"padding:5px 0;color:#333\">Hermeus Ramjet-X, expendable ramjet-powered test aircraft<\/td><\/tr><tr><td style=\"padding:5px 12px 5px 0;color:#555;vertical-align:top;white-space:nowrap\"><strong>Unveiled<\/strong><\/td><td style=\"padding:5px 0;color:#333\">9 September 2026<\/td><\/tr><tr><td style=\"padding:5px 12px 5px 0;color:#555;vertical-align:top;white-space:nowrap\"><strong>Carrier<\/strong><\/td><td style=\"padding:5px 0;color:#333\">Hermeus Quarterhorse, a reusable high-speed uncrewed aircraft roughly the size of an F-16<\/td><\/tr><tr><td style=\"padding:5px 12px 5px 0;color:#555;vertical-align:top;white-space:nowrap\"><strong>Release conditions<\/strong><\/td><td style=\"padding:5px 0;color:#333\">Around Mach 3, where the ramjet can begin operating<\/td><\/tr><tr><td style=\"padding:5px 12px 5px 0;color:#555;vertical-align:top;white-space:nowrap\"><strong>Target performance<\/strong><\/td><td style=\"padding:5px 0;color:#333\">Around Mach 4 and about 100,000 feet<\/td><\/tr><tr><td style=\"padding:5px 12px 5px 0;color:#555;vertical-align:top;white-space:nowrap\"><strong>Size<\/strong><\/td><td style=\"padding:5px 0;color:#333\">Approximately 22 feet long and 7 feet wide, per Axios<\/td><\/tr><tr><td style=\"padding:5px 12px 5px 0;color:#555;vertical-align:top;white-space:nowrap\"><strong>Configuration<\/strong><\/td><td style=\"padding:5px 0;color:#333\">Delta wing with pronounced dihedral, no horizontal tail, vertical fin plus ventral fin<\/td><\/tr><tr><td style=\"padding:5px 12px 5px 0;color:#555;vertical-align:top;white-space:nowrap\"><strong>Carriage<\/strong><\/td><td style=\"padding:5px 0;color:#333\">Company imagery shows one Ramjet-X on a pylon under each wing, with six underwing hardpoints in total<\/td><\/tr><tr><td style=\"padding:5px 12px 5px 0;color:#555;vertical-align:top;white-space:nowrap\"><strong>Business model<\/strong><\/td><td style=\"padding:5px 0;color:#333\">&ldquo;Flight Test as a Service&rdquo; for outside customers<\/td><\/tr><tr><td style=\"padding:5px 12px 5px 0;color:#555;vertical-align:top;white-space:nowrap\"><strong>Government link<\/strong><\/td><td style=\"padding:5px 0;color:#333\">Selected by the Defense Innovation Unit under the HyCAT high-cadence airborne testing programme<\/td><\/tr><\/table><\/div>\r\n\r\n\r\n\r\n<h2 style=\"padding-top:22px\">The problem Hermeus is actually solving<\/h2>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">High-speed flight testing in the United States is not short of ideas. It is short of flights. Every experiment that needs a sustained Mach 4 environment has historically needed its own booster, its own range slot, its own mountain of paperwork, and its own budget line, and the hardware is consumed each time. The result is a field that advances in single-digit numbers of flights per decade.<\/p>\r\n\r\n\r\n\r\n<div style=\"background:#f8f9fa;border-left:4px solid #5C91FF;padding:20px 22px;margin:18px 0 24px;font-size:16px;line-height:1.7;display:flex;gap:20px;align-items:flex-start\"><div><em>&ldquo;America didn&rsquo;t lose ground in high-speed flight because of a lack of ideas. We slowed down because flight tests became too expensive, too rare, and too cautious.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Zach Shore<\/strong> &mdash; Announcing Ramjet-X on X, 9 September 2026<\/div><\/div><\/div>\r\n\r\n<div style=\"max-width:550px;margin:0 auto 28px\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/platform.twitter.com\/embed\/Tweet.html?id=2097714089753501722&theme=light\" style=\"width:100%;height:400px;border:none;overflow:hidden\" allowfullscreen><\/iframe><\/div>\r\n\r\n<p class=\"wp-block-paragraph\">Replacing the booster with an aeroplane changes the arithmetic in two ways at once. The expensive, reusable half of the system comes back and flies again, and the launch itself can happen inside an approved test range rather than requiring the range to be built around a launch site. Hermeus can, in principle, take off from an ordinary airport near a range, release inside the block, and land again.<\/p>\r\n\r\n\r\n\r\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\/09\/hermeus-quarterhorse-high-speed-drone-prototype.jpg\" alt=\"The Hermeus Quarterhorse, a reusable high-speed uncrewed aircraft prototype\" 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 Quarterhorse: roughly F-16 sized, uncrewed, and reusable. It is the half of the system that comes home. Photo: Wikimedia Commons<\/figcaption><\/figure>\r\n\r\n\r\n<p class=\"wp-block-paragraph\">The imagery Hermeus released shows a Ramjet-X under each Quarterhorse wing, which implies two separate high-Mach experiments in a single sortie. It also shows six underwing hardpoints altogether. Hermeus has not said what the other four are for, and that silence is doing more marketing than any press release could.<\/p>\r\n\r\n\r\n\r\n<h2 style=\"padding-top:22px\">A very familiar silhouette<\/h2>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Ramjet-X is a compact, missile-like vehicle with delta wings carrying pronounced dihedral, no horizontal tail surfaces, a conventional fin and a ventral fin underneath. Ramjet propulsion, air launch from a fast mothership, an expendable airframe. Aviation historians will recognise all of that.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Lockheed's D-21 Tagboard did exactly this in the 1960s, launched from the back of an M-21 derivative of the A-12. The D-21 was a much larger animal, more than 40 feet long with a 20-foot wingspan against roughly 22 feet and 7 feet for Ramjet-X, and it was a reconnaissance drone rather than a test article. But the architecture is the same idea, sixty years apart, and it failed the first time partly because separating two vehicles at high Mach is genuinely difficult. Hermeus is proposing to do it under the wing rather than off the back, which avoids the specific way the D-21 programme went wrong.<\/p>\r\n\r\n\r\n\r\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\/09\/hermeus-ramjet-x-expendable-hypersonic-test-vehicle.png\" alt=\"Hermeus Ramjet-X expendable ramjet test vehicle shown in company imagery\" 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\">Ramjet-X as shown by Hermeus: delta wings with marked dihedral, a ventral fin and no horizontal tails. Company imagery; the vehicle has not yet flown. Image: Hermeus<\/figcaption><\/figure>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">What is not being said<\/h2>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Hermeus has released no range figure, no payload capacity, and crucially no cost per flight, which is the number the entire pitch depends on. It has also not said whether the Ramjet-X vehicles are recoverable, and the company describes them as expendable, which suggests not.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">What it has described is the business model. Hermeus is calling it Flight Test as a Service: customers put payloads on the vehicle, including sensors, communications gear, computing and autonomy hardware, materials samples and propulsion experiments, and buy a trip to sustained Mach 4 the way you would buy a ride on a launch vehicle. The Defense Innovation Unit has already selected Hermeus for HyCAT, its programme for buying commercial high-speed flight testing, so there is at least one customer in the room.<\/p>\r\n\r\n\r\n\r\n<h2 style=\"padding-top:22px\">Can Quarterhorse actually do this yet?<\/h2>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Not today. Quarterhorse Mk 2.1 reached Mach 1.21 on its third flight earlier this year, which made it, by Hermeus's account, the first privately developed uncrewed supersonic jet. That is a long way short of Mach 3.<\/p>\r\n\r\n\r\n\r\n<div style=\"max-width:550px;margin:0 auto 28px\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/platform.twitter.com\/embed\/Tweet.html?id=2059258251720659266&theme=light\" style=\"width:100%;height:400px;border:none;overflow:hidden\" allowfullscreen><\/iframe><\/div>\r\n\r\n<p class=\"wp-block-paragraph\">The Ramjet-X release condition of roughly Mach 3 points at a later airframe. Hermeus confirmed over the summer that Quarterhorse Mk 2.2 and the Mach 3-capable Mk 2.3 are under construction, and the Quarterhorse in the Ramjet-X imagery has visibly different landing gear from the 2.1, including twin nosewheels. This is a concept for an aircraft that does not exist yet, carrying a vehicle that has not been built, and both halves are on the company's stated roadmap.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Hermeus's own footage of the Mk 2.1's first flight is below, for a sense of how far along the carrier half of the equation actually is.<\/p>\r\n\r\n\r\n\r\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\/apuGYFkTc5g\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n\r\n<p class=\"wp-block-paragraph\">The idea is sound and the physics are old. What Hermeus is betting is that the reason America stopped flying fast was never engineering. It was accounting.<\/p>\r\n\r\n\r\n\r\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>\r\n\r\n\r\n<section class=\"mfq\"><h2>Frequently Asked Questions<\/h2><div class=\"qa\"><details open><summary>What is the Hermeus Ramjet-X?<\/summary><div class=\"a\">Ramjet-X is an expendable, ramjet-powered test vehicle unveiled by Hermeus on 9 September 2026. It is designed to be carried under the wing of the company&rsquo;s reusable Quarterhorse drone, released at around Mach 3, and then to accelerate under its own ramjet power to roughly Mach 4 at about 100,000 feet. Axios reports it is approximately 22 feet long and 7 feet wide.<\/div><\/details><details><summary>Why does a ramjet need to be launched from another aircraft?<\/summary><div class=\"a\">A ramjet has no compressor. It relies on the vehicle&rsquo;s own forward speed to compress incoming air, so it produces no useful thrust from a standstill and must be accelerated to high supersonic speed by something else. Traditionally that has meant an expendable rocket booster on every test. Hermeus proposes to use a reusable aircraft instead, so only the small test vehicle is consumed.<\/div><\/details><details><summary>Has Ramjet-X flown?<\/summary><div class=\"a\">No. Hermeus unveiled Ramjet-X as a concept on 9 September 2026 and has released imagery but no flight. The Quarterhorse variant able to reach the required Mach 3 release condition, believed to be the Mk 2.3, is still under construction.<\/div><\/details><details><summary>How fast has the Hermeus Quarterhorse actually flown?<\/summary><div class=\"a\">Quarterhorse Mk 2.1 reached Mach 1.21 on its third test flight earlier in 2026. Hermeus describes it as the first privately developed uncrewed supersonic jet. Quarterhorse Mk 2.2 and the Mach 3-capable Mk 2.3 were confirmed to be under construction during summer 2026.<\/div><\/details><details><summary>Is Ramjet-X the same idea as the Lockheed D-21?<\/summary><div class=\"a\">The architecture is similar: a ramjet-powered, air-launched, expendable vehicle released from a fast mothership. The D-21 Tagboard of the 1960s was a reconnaissance drone rather than a test article and was much larger, at more than 40 feet long with a 20-foot wingspan. The D-21 was launched from the back of its M-21 carrier, a separation that proved dangerous; Ramjet-X is shown on underwing pylons instead.<\/div><\/details><details><summary>What is &ldquo;Flight Test as a Service&rdquo;?<\/summary><div class=\"a\">It is the business model Hermeus is proposing around Ramjet-X: outside customers buy a flight rather than build their own test vehicle, putting payloads such as sensors, communications equipment, computing and autonomy systems, materials samples or propulsion hardware into a sustained high-Mach environment. The Defense Innovation Unit has selected Hermeus under its HyCAT programme, which exists to buy exactly this kind of commercial high-speed testing.<\/div><\/details><\/div><\/section>\r\n\r\n\r\n\r\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is the Hermeus Ramjet-X?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Ramjet-X is an expendable, ramjet-powered test vehicle unveiled by Hermeus on 9 September 2026. It is designed to be carried under the wing of the company\u2019s reusable Quarterhorse drone, released at around Mach 3, and then to accelerate under its own ramjet power to roughly Mach 4 at about 100,000 feet. Axios reports it is approximately 22 feet long and 7 feet wide.\"}},{\"@type\":\"Question\",\"name\":\"Why does a ramjet need to be launched from another aircraft?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A ramjet has no compressor. 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The Defense Innovation Unit has selected Hermeus under its HyCAT programme, which exists to buy exactly this kind of commercial high-speed testing.\"}}]}<\/script><p class=\"wp-block-paragraph\"><em>Sources: Hermeus; The War Zone; Axios; Defense Innovation Unit.<\/em><\/p>\r\n\r\n\r\n\r\n<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\/mach-5-startup-hermeus-hits-1-billion-valuation\/\">Mach 5 Startup Hermeus Hits $1 Billion Valuation<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/ge-aerospace-derecho-mach-5-hypersonic-testbed-diu-hycat-2026\/\">GE Aerospace Wins DIU Contract for Mach 5 Derecho Testbed<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/gilmour-space-hypersonix-hypersonic-flight-test-2026\/\">Gilmour and Hypersonix: Australia Wants to Sell Mach 5 Tests<\/a><\/p><\/div>\r\n","protected":false},"excerpt":{"rendered":"<p>Hermeus wants to stop throwing away a rocket booster on every hypersonic test. Ramjet-X rides under a Quarterhorse to Mach 3 and lets go.<\/p>","protected":false},"author":26,"featured_media":21454987,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[664,670],"tags":[],"class_list":["post-21455474","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-military-aviation","category-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Hermeus Ramjet-X: A Ramjet Dropped From a Drone at Mach 3 | MiGFlug<\/title>\n<meta name=\"description\" content=\"Hermeus unveiled Ramjet-X on 9 September 2026: an expendable ramjet vehicle air-launched from Quarterhorse at Mach 3, aiming for Mach 4 at 100,000 ft.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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