{"id":4944144,"date":"2026-07-11T16:50:00","date_gmt":"2026-07-11T14:50:00","guid":{"rendered":"https:\/\/migflug.com\/jetflights\/?p=4944144"},"modified":"2026-07-11T17:22:46","modified_gmt":"2026-07-11T15:22:46","slug":"sncaso-so9000-trident-french-rocket-jet-interceptor","status":"publish","type":"post","link":"https:\/\/migflug.com\/jetflights\/it\/sncaso-so9000-trident-french-rocket-jet-interceptor\/","title":{"rendered":"The Record-Breaking Jet France Kept Secret"},"content":{"rendered":"<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style>\n<p>In the mid-1950s, a needle-thin French aircraft with jet engines perched on its wingtips and a rocket motor in its belly clawed its way toward the edge of space, touching nearly twice the speed of sound and setting records for how fast a jet could climb. And then France did something strange: it told almost no one.<\/p>\n<p>The SNCASO Trident was one of the boldest and least-known interceptors of the Cold War &mdash; a machine that mixed rocket and jet power to reach heights and speeds that embarrassed aircraft twice its size. It should have been a national triumph. Instead, its finest achievements were quietly buried so as not to embarrass the aircraft the French Air Force had already chosen: the Dassault Mirage.<\/p>\n<p>Its story is one of dazzling performance, a terrifying fuel, and a death that helped seal its fate.<\/p>\n\n<div style=\"background:#f5f5f5;border-radius:8px;padding:20px 22px;margin:24px 0;font-size:15px;line-height:1.8\"><strong style=\"font-size:17px\">Quick Facts<\/strong><br>\n&bull; <strong>Aircraft:<\/strong> SNCASO SO.9000 \/ SO.9050 Trident &mdash; French mixed-power interceptor<br>\n&bull; <strong>Power:<\/strong> a SEPR rocket motor in the fuselage plus two turbojets mounted on the wingtips<br>\n&bull; <strong>First flight:<\/strong> 2 March 1953, test pilot Jacques Guignard, on the jets alone<br>\n&bull; <strong>Performance:<\/strong> reached close to Mach 2 and set world records for rate of climb<br>\n&bull; <strong>Fuel:<\/strong> a volatile mix of Furaline and nitric acid &mdash; hazardous, and ultimately deadly<br>\n&bull; <strong>Fatal crash:<\/strong> 21 May 1957, a Trident exploded in mid-air, killing test pilot Charles Goujon<br>\n&bull; <strong>Fate:<\/strong> cancelled in 1957; the Air Force chose the Dassault Mirage III &mdash; only about a dozen were built<\/div>\n\n<h2 style=\"padding-top:22px\">France&rsquo;s postwar comeback<\/h2>\n<p>The Trident was born of ambition and anxiety. French aviation had been strangled under occupation, and after the war the country was desperate both to revive its aircraft industry and to defend its cities against a new threat: high-flying Soviet bombers carrying nuclear weapons. What was needed was an interceptor that could be scrambled and rocket to altitude in a matter of minutes. Impressed by Germany&rsquo;s wartime Me 163 rocket fighter but wary of relying on rocket power alone, the French Air Force asked for a hybrid &mdash; part rocket, part jet.<\/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\/7C30ABKn9Bw\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;border-radius:8px\" allowfullscreen><\/iframe><\/div>\n\n<h2 style=\"padding-top:22px\">A rocket in the belly, jets on the wingtips<\/h2>\n<p>SNCASO&rsquo;s answer was as elegant as it was unusual. The fuselage was long, slim and streamlined around a single seat set low in the airframe. A SEPR rocket motor sat inside the fuselage to hurl the aircraft skyward, while two small turbojets were bolted to the wingtips for ordinary flight. The rocket burned a mixture of Furaline and nitric acid &mdash; propellants chosen partly because they needed no separate ignition, but which were unforgiving to handle.<\/p>\n\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px\"><img data-opt-id=327544666  fetchpriority=\"high\" decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/ml5psubhxdln.i.optimole.com\/cb:0e0_.b970\/w:auto\/h:auto\/q:mauto\/ig:avif\/https:\/\/migflug.com\/jetflights\/wp-content\/uploads\/sites\/4\/2026\/07\/sncaso-trident-so9000.jpg\" alt=\"SNCASO SO.9000 Trident on the ground\" style=\"max-width:100%;height:auto;border-radius:6px\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">The Trident carried a rocket in the fuselage and a turbojet on each wingtip. Photo: Wikimedia Commons.<\/figcaption><\/figure>\n\n<div style=\"background:#f8f9fa;border-left:4px solid #5C91FF;padding:20px 22px;margin:18px 0 24px;border-radius:0 8px 8px 0;font-size:16px;line-height:1.7\"><em>&ldquo;The fuel would consist of a mix of Furaline and nitric acid, which was more difficult and somewhat hazardous to produce.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Guy Davey<\/strong> &mdash; PlaneHistoria, on the Trident&rsquo;s rocket propellant<\/div><\/div>\n\n<h2 style=\"padding-top:22px\">Blisteringly fast &mdash; and dangerous to fly<\/h2>\n<p>On 2 March 1953, test pilot Jacques Guignard took the first Trident aloft, using the entire runway to get airborne on the weak wingtip jets alone. Once the rocket was lit, though, the little aircraft transformed, eventually pushing toward Mach 2. But the volatile fuel that gave it such performance also made it lethal. On 21 May 1957, while rehearsing for a display at the Paris Air Show, a Trident exploded in mid-air; investigators concluded the Furaline and nitric acid had mixed and detonated, killing test pilot Charles Goujon.<\/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\/pVFclGYU-UY\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;border-radius:8px\" allowfullscreen><\/iframe><\/div>\n\n<h2 style=\"padding-top:22px\">The records nobody was allowed to hear about<\/h2>\n<p>Even after that tragedy, the improved Trident II kept astonishing everyone who saw it fly. It reached close to Mach 2 and, in 1958, set a record for the fastest climb ever recorded by a jet aircraft, rocketing toward altitudes few contemporaries could touch. It was exactly the kind of achievement a nation trumpets to the world. France did the opposite &mdash; because by then the Air Force had already committed to the Dassault Mirage III, and loud praise for a rival design would only have caused embarrassment.<\/p>\n\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px\"><img data-opt-id=645946565  fetchpriority=\"high\" decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/ml5psubhxdln.i.optimole.com\/cb:0e0_.b970\/w:auto\/h:auto\/q:mauto\/ig:avif\/https:\/\/migflug.com\/jetflights\/wp-content\/uploads\/sites\/4\/2026\/07\/sncaso-trident-le-bourget-museum.jpg\" alt=\"The surviving SNCASO Trident preserved at the Mus\u00e9e de l\u2019Air et de l\u2019Espace\" style=\"max-width:100%;height:auto;border-radius:6px\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">The only surviving Trident, on display at Le Bourget. Photo: Wikimedia Commons.<\/figcaption><\/figure>\n\n<h2 style=\"padding-top:22px\">Beaten by the Mirage<\/h2>\n<p>The French Air Force briefly ordered a handful of production Tridents, then cancelled them amid budget cuts. A record-breaking demonstration flight was flown to win back official enthusiasm, but the effort came to nothing.<\/p>\n\n<div style=\"background:#f8f9fa;border-left:4px solid #5C91FF;padding:20px 22px;margin:18px 0 24px;border-radius:0 8px 8px 0;font-size:16px;line-height:1.7\"><em>&ldquo;As a public relations stunt it failed to make much of an impact on the French Air Force.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Guy Davey<\/strong> &mdash; PlaneHistoria, on the Trident&rsquo;s final bid for support<\/div><\/div>\n\n<p>The Mirage was simpler, cheaper and easier to maintain, and it would go on to become one of the most successful fighters in history. The Trident, for all its brilliance, was dismantled for spares, and a single surviving example was sent to a museum. It remains one of the fastest, wildest interceptors of its age &mdash; and one that most of the world never even knew existed.<\/p>\n<p style=\"font-size:13px;color:#777;font-style:italic;margin-top:20px\">Sources: PlaneHistoria (Guy Davey); Wikipedia (SNCASO Trident); Military Factory. Speed and altitude figures vary between sources and are given as reported.<\/p>\n<!-- mf-faq -->\n\n<div class=\"mf-faq-block\"><style>.mf-faq-block{margin:34px 0}.mf-faq-item:not([open]) .mf-faq-answer{display:none !important}.mf-faq-block h2.mf-faq-h{padding-top:22px;margin-bottom:14px}.mf-faq-item{border:1px solid #e2e8f5;border-radius:8px;margin:0 0 10px;background:#fff}.mf-faq-item summary{list-style:none;cursor:pointer;padding:15px 50px 15px 18px;font-weight:600;color:#1a1a1a;position:relative;line-height:1.45;user-select:none}.mf-faq-item summary::-webkit-details-marker{display:none}.mf-faq-item summary::after{content:\"+\";position:absolute;right:18px;top:50%;transform:translateY(-50%);font-size:1.5em;font-weight:400;color:#5C91FF;line-height:1}.mf-faq-item[open] summary::after{content:\"\\2013\"}.mf-faq-item[open] summary{border-bottom:1px solid #eef1f8}.mf-faq-item summary:hover{background:#f5f8ff}.mf-faq-answer{padding:14px 18px;color:#333;line-height:1.6}.mf-faq-answer p{margin:0}.mf-faq-answer a{color:#5C91FF}<\/style><h2 class=\"mf-faq-h\">Related Questions<\/h2><details class=\"mf-faq-item\"><summary>What was the SNCASO Trident?<\/summary><div class=\"mf-faq-answer\"><p>The SNCASO Trident (SO.9000 \/ SO.9050) was a French mixed-power interceptor of the 1950s that combined a SEPR rocket motor in the fuselage with two small turbojets mounted on its wingtips. It flew close to Mach 2 and set world climb records, but France cancelled it in 1957 after only about a dozen were built.<\/p><\/div><\/details><details class=\"mf-faq-item\"><summary>How fast was the SNCASO Trident?<\/summary><div class=\"mf-faq-answer\"><p>The Trident reached close to Mach 2 \u2014 nearly twice the speed of sound \u2014 remarkable for a 1950s aircraft. In 1958 the improved Trident II set a world record for the fastest climb ever recorded by a jet aircraft, rocketing to altitudes few contemporaries could touch. France, however, kept these achievements quiet to avoid embarrassing the Mirage III.<\/p><\/div><\/details><details class=\"mf-faq-item\"><summary>Why did the Trident have jet engines on its wingtips?<\/summary><div class=\"mf-faq-answer\"><p>Mounting the two small turbojets on the wingtips left the Trident's slim fuselage free for the SEPR rocket motor and its propellants. The turbojets handled ordinary flight, take-off and landing, while the rocket in the belly hurled the aircraft toward altitude. The wingtip jets alone were weak \u2014 on its first flight the Trident needed the entire runway to get airborne.<\/p><\/div><\/details><details class=\"mf-faq-item\"><summary>What fuel did the Trident's rocket engine use?<\/summary><div class=\"mf-faq-answer\"><p>The Trident's SEPR rocket burned a mix of Furaline and nitric acid, chosen partly because the propellants ignited on contact and needed no separate ignition system. The combination was hazardous to produce and unforgiving to handle, and it ultimately proved deadly when the propellants mixed and detonated in flight in 1957.<\/p><\/div><\/details><details class=\"mf-faq-item\"><summary>Why was the SNCASO Trident cancelled?<\/summary><div class=\"mf-faq-answer\"><p>France cancelled the Trident in 1957 because the Air Force had already committed to the <a href=\"https:\/\/migflug.com\/jetflights\/marcel-dassault-bloch-buchenwald-mirage\/\">Dassault<\/a> Mirage III, and budget cuts killed the small production order. Even record-breaking demonstration flights could not win back official enthusiasm \u2014 a fate similar to the <a href=\"https:\/\/migflug.com\/jetflights\/miles-m52-britain-supersonic-jet-cancelled-1946\/\">supersonic jet Britain threw away<\/a> a decade earlier.<\/p><\/div><\/details><details class=\"mf-faq-item\"><summary>What happened to Trident test pilot Charles Goujon?<\/summary><div class=\"mf-faq-answer\"><p>Charles Goujon was killed on 21 May 1957 when his Trident exploded in mid-air while rehearsing for a display at the Paris Air Show. Investigators concluded the rocket's Furaline and nitric acid propellants had mixed and detonated. The tragedy helped seal the programme's fate later that year.<\/p><\/div><\/details><details class=\"mf-faq-item\"><summary>What is a mixed-power interceptor?<\/summary><div class=\"mf-faq-answer\"><p>A mixed-power interceptor combines a rocket motor for blistering climb performance with jet engines for ordinary flight and landing. France pursued the concept after being impressed by the wartime <a href=\"https:\/\/migflug.com\/jetflights\/messerschmitt-history-bf-109-kabinenroller-airbus\/\">Messerschmitt<\/a> Me 163 rocket fighter, but wary of relying on rocket power alone \u2014 the Trident's answer was a rocket in the belly and turbojets on the wingtips.<\/p><\/div><\/details><details class=\"mf-faq-item\"><summary>When did the SNCASO Trident first fly?<\/summary><div class=\"mf-faq-answer\"><p>The Trident first flew on 2 March 1953 with test pilot Jacques Guignard at the controls, using the wingtip turbojets alone. The underpowered jets forced him to use the entire runway to get airborne \u2014 but once the rocket was lit, the little aircraft transformed, eventually pushing toward Mach 2.<\/p><\/div><\/details><details class=\"mf-faq-item\"><summary>Where can you see a SNCASO Trident today?<\/summary><div class=\"mf-faq-answer\"><p>The only surviving Trident is on public display at Le Bourget near Paris, home of the French air and space museum. It is the last remnant of a programme that built only about a dozen aircraft before cancellation in 1957.<\/p><\/div><\/details><\/div>\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What was the SNCASO Trident?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The SNCASO Trident (SO.9000 \/ SO.9050) was a French mixed-power interceptor of the 1950s that combined a SEPR rocket motor in the fuselage with two small turbojets mounted on its wingtips. 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France pursued the concept after being impressed by the wartime <a href=\\\"https:\/\/migflug.com\/jetflights\/messerschmitt-history-bf-109-kabinenroller-airbus\/\\\">Messerschmitt<\/a> Me 163 rocket fighter, but wary of relying on rocket power alone \u2014 the Trident's answer was a rocket in the belly and turbojets on the wingtips.\"}},{\"@type\":\"Question\",\"name\":\"When did the SNCASO Trident first fly?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The Trident first flew on 2 March 1953 with test pilot Jacques Guignard at the controls, using the wingtip turbojets alone. 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It is the last remnant of a programme that built only about a dozen aircraft before cancellation in 1957.\"}}]}<\/script><!-- \/mf-faq -->\n\n<div style=\"background:#f0f4ff;border-left:4px solid #5C91FF;padding:16px 20px;margin:32px 0 8px;border-radius:0 8px 8px 0\"><p style=\"margin:0 0 8px;font-weight:600;color:#333\">Related Posts<\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/jetflights\/nord-1500-griffon-ramjet-fighter-andre-turcat\/\">The Ramjet Fighter That Hit Mach 2 on Half an Engine<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/jetflights\/messerschmitt-me-163-komet-rocket-fighter\/\">The Rocket Fighter That Dissolved Its Pilots<\/a><\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>France\u2019s SNCASO Trident mixed a rocket with two wingtip jets, hit nearly Mach 2 and set climb records \u2014 then France quietly buried it to protect the Mirage.<\/p>","protected":false},"author":25,"featured_media":4943373,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[666,664],"tags":[],"class_list":["post-4944144","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 v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>SNCASO Trident: The Record-Breaking Jet France Buried<\/title>\n<meta name=\"description\" content=\"France\u2019s SNCASO Trident mixed a rocket with two jets, hit nearly Mach 2 and set climb records \u2014 then France hid it all to protect the Mirage III.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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