{"id":19623880,"date":"2026-09-03T11:18:10","date_gmt":"2026-09-03T09:18:10","guid":{"rendered":"https:\/\/migflug.com\/afterburner\/dornier-do-x-twelve-engine-flying-boat-169-passengers\/"},"modified":"2026-09-04T08:41:46","modified_gmt":"2026-09-04T06:41:46","slug":"dornier-do-x-twelve-engine-flying-boat-169-passengers","status":"publish","type":"post","link":"https:\/\/migflug.com\/afterburner\/dornier-do-x-twelve-engine-flying-boat-169-passengers\/","title":{"rendered":"Dornier Do X: The 12-Engine Flying Boat That Carried 169 People"},"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 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No aircraft had ever carried close to that many. The record would stand for about twenty years.<\/p>\r\n\r\n<p>The Dornier Do X had twelve engines mounted above its wing in six back-to-back pairs, three passenger decks, a smoking room with a wet bar, and a flight engineer who worked twelve throttles from a separate control room and took his orders by engine-order telegraph, exactly as on a ship. Because that is what Claude Dornier had built: an ocean liner that happened to fly.<\/p>\r\n\r\n<p>Barely.<\/p>\r\n\r\n\r\n<div style=\"background:#f5f5f5;padding:20px 22px;margin:24px 0;font-size:15px;line-height:1.8\"><p style=\"margin:0 0 10px;font-weight:600;font-size:17px\">Quick Facts<\/p><p style=\"margin:4px 0\"><strong>Designer:<\/strong> Claude Dornier<\/p><p style=\"margin:4px 0\"><strong>Built at:<\/strong> Altenrhein, Switzerland &mdash; outside German territory, to sidestep Treaty of Versailles limits<\/p><p style=\"margin:4px 0\"><strong>First left the water:<\/strong> 12 July 1929<\/p><p style=\"margin:4px 0\"><strong>Engines:<\/strong> twelve, in six tandem push-pull pairs above the wing<\/p><p style=\"margin:4px 0\"><strong>Record flight:<\/strong> 169 people aloft, 21 October 1929<\/p><p style=\"margin:4px 0\"><strong>Cruise speed:<\/strong> about 170 km\/h<\/p><p style=\"margin:4px 0\"><strong>Intended capacity:<\/strong> 66 passengers long-haul, up to 100 on short routes<\/p><p style=\"margin:4px 0\"><strong>Built:<\/strong> three &mdash; one German, two Italian<\/p><p style=\"margin:4px 0\"><strong>Survivors:<\/strong> none; a tail section is at the Dornier Museum, Friedrichshafen<\/p><\/div>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">Built in Switzerland on purpose<\/h2>\r\n\r\n<p>The Treaty of Versailles capped what German factories were allowed to build. Dornier&rsquo;s answer was to build it somewhere else. The works went up at Altenrhein, on the Swiss shore of Lake Constance, a few miles from Germany and comfortably outside the treaty&rsquo;s reach. Construction began in December 1927 and took something in the region of 240,000 working hours.<\/p>\r\n\r\n<p>What emerged was, by a wide margin, the largest and heaviest aircraft in the world. It had no wing floats; instead it used sponsons &mdash; stub wings low on the hull that steadied it on the water and doubled as boarding platforms. The lower deck held the fuel and nine watertight compartments, only seven of which were needed to keep it afloat.<\/p>\r\n\r\n<p>The aviation press was, briefly, lost for words.<\/p>\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\"><em>&ldquo;Rarely in the history of flying has a machine so captured the imagination as has the large Dornier flying ship, the &lsquo;Do. X.&rsquo; The size is beyond anything previously accomplished; the lines of the machine are unusual; and the power plant arrangement is novel.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Flight<\/strong> &mdash; The aeronautical weekly, official organ of the Royal Aero Club, 21 February 1930<\/div><\/div>\r\n<h2 style=\"padding-top:22px\">169 people, no passenger certificate<\/h2>\r\n\r\n<p>The October 1929 flight was a demonstration, and a slightly reckless one. The aircraft held no passenger certification at all. The people aboard were mostly Dornier workers and their families, plus journalists and crew, and depending on which account you read there were either nine stowaways in the total or none at all. The aircraft climbed to around 200 metres, flew a circuit over Bregenz, Lindau and Friedrichshafen, and came back down after roughly fifty minutes.<\/p>\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\"><em>&ldquo;The reports that have appeared concerning the flight of the Do.X have been so contradictory that it is impossible to get at the exact figures.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Flight<\/strong> &mdash; Editorial comment, \"Airship or Flying-Boat\", 25 October 1929<\/div><\/div>\r\n<p>That was written four days after the event. Ninety-seven years later the exact breakdown of those 169 people is still disputed. The total, at least, everyone agrees on.<\/p>\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\/dornier-do-x-dining-salon.jpg\" alt=\"The dining salon aboard the Dornier Do X\" 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 dining salon. Upholstered chairs, laid tables, curtained portholes and rugs, roughly 200 metres above Lake Constance. Photo: Bundesarchiv, CC BY-SA 3.0 de<\/figcaption><\/figure>\r\n<h2 style=\"padding-top:22px\">The problem with twelve engines<\/h2>\r\n\r\n<p>The original powerplant was twelve Siemens-built Bristol Jupiter radials, each around 525 horsepower. On paper that is 6,000 hp. In practice they overheated at the sustained high revolutions the aircraft demanded, and the Do X could barely drag itself to 425 metres.<\/p>\r\n\r\n<p>Read that again. An aircraft with a quoted service ceiling of 3,200 metres could not reliably get above about four hundred. It was, functionally, a machine that flew in ground effect and slightly above it. After 103 flights the Jupiters came out and twelve water-cooled Curtiss Conqueror V-12s went in, which bought it roughly another hundred metres of altitude &mdash; enough, just, to attempt an ocean.<\/p>\r\n\r\n<p>Managing all this fell to a flight engineer in his own compartment on the upper deck, plus a team of mechanics who crouched in a crawlway barely over a metre high inside the wing, each nursing two engines.<\/p>\r\n\r\n<h2 style=\"padding-top:22px\">Ten months to New York<\/h2>\r\n\r\n<p>In November 1930 the Do X set off for America. It went the long way, because it had to: Netherlands, England, France, Spain, Portugal. At Lisbon a fire destroyed the covering of the left wing &mdash; contemporary reporting in <em>Flight<\/em> blamed an electrical fault &mdash; and the aircraft sat there for around six weeks being repaired.<\/p>\r\n\r\n<p>Then down the West African coast, out to the Cape Verde islands, across the Atlantic at its narrowest point to Natal in Brazil, up through Rio and the Caribbean, and finally into New York on 27 August 1931. Elapsed time from Friedrichshafen: very nearly ten months.<\/p>\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\/dornier-do-x-over-the-atlantic-1932.jpg\" alt=\"The Dornier Do X over the Atlantic in 1932\" 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 Do X over the Atlantic in May 1932, its own shadow on the water beneath it. Photo: Bundesarchiv, CC BY-SA 3.0 de<\/figcaption><\/figure>\r\n<p>It then spent nine months in New York having its engines overhauled while sightseers came to look at it, and returned to Berlin in May 1932 to a crowd reported at 200,000 people.<\/p>\r\n\r\n<h2 style=\"padding-top:22px\">What happened to them<\/h2>\r\n\r\n<p>Three were built. The German aircraft was withdrawn after a heavy landing on a reservoir near Passau in 1933 tore the tail off &mdash; an accident that was quietly not publicised &mdash; and ended up as the centrepiece of the German aviation collection in Berlin, where it was wrecked in a bombing raid in November 1943. The two Italian machines, powered by Fiat engines, were mothballed at Marina di Pisa in 1935 and broken up for scrap two years later.<\/p>\r\n\r\n<p>The verdict that matters was reached almost immediately. In that same October 1929 editorial, having done the arithmetic on payload against power reserve, <em>Flight<\/em> concluded that as a commercial proposition the Do X might not be quite so favourably placed as it first appeared. It took Dornier another three years to agree.<\/p>\r\n\r\n<p>Period footage, from the Dornier Museum&rsquo;s own archive:<\/p>\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\/v2aaXfqxFrQ\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n<p>And a 1930 film of a flight aboard it, which gives a far better sense of the scale of the thing than any specification:<\/p>\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\/7h1beFHjHno\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n<p>More archive film of the aircraft in service:<\/p>\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\/71D1S8-1kUY\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\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>What was the Dornier Do X?<\/summary><div class=\"a\">A German flying boat of 1929, the largest and heaviest aircraft in the world at the time. It had twelve engines mounted above the wing in six back-to-back pairs, three passenger decks, and accommodation that included a smoking room with a wet bar and a dining salon.<\/div><\/details><details><summary>How many people did the Do X carry on its record flight?<\/summary><div class=\"a\">169, on 21 October 1929 over Lake Constance. No aircraft had ever carried close to that many, and the record stood for about twenty years. The aircraft held no passenger certification at the time.<\/div><\/details><details><summary>Why was the Do X built in Switzerland?<\/summary><div class=\"a\">Because the Treaty of Versailles capped what German factories were allowed to build. Dornier built the works at Altenrhein on the Swiss shore of Lake Constance, a few miles from Germany and outside the treaty&rsquo;s reach.<\/div><\/details><details><summary>What was wrong with the Do X?<\/summary><div class=\"a\">It could barely climb. Its quoted service ceiling was 3,200 metres, but on its original Bristol Jupiter engines it could scarcely reach 425 metres, because they overheated at the sustained high revolutions it demanded. Re-engining with Curtiss Conquerors bought only about another hundred metres.<\/div><\/details><details><summary>Did the Do X cross the Atlantic?<\/summary><div class=\"a\">Yes, eventually. It left Germany in November 1930 and reached New York on 27 August 1931, taking very nearly ten months. The route went via the Netherlands, England, France, Spain, Portugal, West Africa and Cape Verde, crossing the Atlantic at its narrowest point to Brazil.<\/div><\/details><details><summary>How many Do X aircraft were built?<\/summary><div class=\"a\">Three. One German and two Italian, the latter powered by Fiat engines. None survives; a tail section is preserved at the Dornier Museum in Friedrichshafen.<\/div><\/details><details><summary>What happened to the original Do X?<\/summary><div class=\"a\">It was withdrawn after a heavy landing on a reservoir near Passau in 1933 tore the tail off, then displayed in the German aviation collection in Berlin, where it was wrecked in a bombing raid in November 1943.<\/div><\/details><\/div><\/section>\n\n\n\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What was the Dornier Do X?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A German flying boat of 1929, the largest and heaviest aircraft in the world at the time. It had twelve engines mounted above the wing in six back-to-back pairs, three passenger decks, and accommodation that included a smoking room with a wet bar and a dining salon.\"}},{\"@type\":\"Question\",\"name\":\"How many people did the Do X carry on its record flight?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"169, on 21 October 1929 over Lake Constance. No aircraft had ever carried close to that many, and the record stood for about twenty years. The aircraft held no passenger certification at the time.\"}},{\"@type\":\"Question\",\"name\":\"Why was the Do X built in Switzerland?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Because the Treaty of Versailles capped what German factories were allowed to build. Dornier built the works at Altenrhein on the Swiss shore of Lake Constance, a few miles from Germany and outside the treaty\u2019s reach.\"}},{\"@type\":\"Question\",\"name\":\"What was wrong with the Do X?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It could barely climb. Its quoted service ceiling was 3,200 metres, but on its original Bristol Jupiter engines it could scarcely reach 425 metres, because they overheated at the sustained high revolutions it demanded. Re-engining with Curtiss Conquerors bought only about another hundred metres.\"}},{\"@type\":\"Question\",\"name\":\"Did the Do X cross the Atlantic?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, eventually. It left Germany in November 1930 and reached New York on 27 August 1931, taking very nearly ten months. The route went via the Netherlands, England, France, Spain, Portugal, West Africa and Cape Verde, crossing the Atlantic at its narrowest point to Brazil.\"}},{\"@type\":\"Question\",\"name\":\"How many Do X aircraft were built?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Three. One German and two Italian, the latter powered by Fiat engines. None survives; a tail section is preserved at the Dornier Museum in Friedrichshafen.\"}},{\"@type\":\"Question\",\"name\":\"What happened to the original Do X?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It was withdrawn after a heavy landing on a reservoir near Passau in 1933 tore the tail off, then displayed in the German aviation collection in Berlin, where it was wrecked in a bombing raid in November 1943.\"}}]}<\/script><p><em>Sources: Flight, 25 October 1929 and 21 February 1930; Der Spiegel einestages, 2009; Dornier Museum Friedrichshafen; Bundesarchiv.<\/em><\/p>\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\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\/saunders-roe-princess-flying-boat-too-late\/\">Britain&rsquo;s Giant Flying Boat, Born Too Late<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/nine-wings-lago-maggiore-caproni-ca60-transaereo\/\">Nine Wings on Lago Maggiore: The Caproni Ca.60<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/kalinin-k-7-soviet-seven-engine-giant\/\">The Kalinin K-7: Stalin&rsquo;s Seven-Engine Giant<\/a><\/p><\/div>\r\n","protected":false},"excerpt":{"rendered":"<p>In 1929 a twelve-engined German flying boat lifted 169 people off Lake Constance and set a record that stood for twenty years. It could barely climb above 400 metres.<\/p>\n","protected":false},"author":25,"featured_media":19623586,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[665,666],"tags":[],"class_list":["post-19623880","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aviation-world","category-history-and-legends"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Dornier Do X: The 12-Engine Flying Boat of 1929 | MiGFlug<\/title>\n<meta name=\"description\" content=\"The Dornier Do X carried 169 people over Lake Constance in 1929, a record that stood twenty years. 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