{"id":17423521,"date":"2026-08-28T10:26:00","date_gmt":"2026-08-28T08:26:00","guid":{"rendered":"https:\/\/migflug.com\/afterburner\/?p=17423521"},"modified":"2026-08-28T10:27:26","modified_gmt":"2026-08-28T08:27:26","slug":"mil-v-12-mi-12-largest-helicopter-ever-built-record","status":"publish","type":"post","link":"https:\/\/migflug.com\/afterburner\/fr\/mil-v-12-mi-12-largest-helicopter-ever-built-record\/","title":{"rendered":"Mil V-12: The Largest Helicopter Ever Built, and Its Unbeaten Record"},"content":{"rendered":"<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style>\r\n\r\n<p>On 6 August 1969, a Soviet helicopter lifted 40,204.5 kilograms \u2014 just over 40 tonnes \u2014 to a height of 2,255 metres. That is roughly the weight of a loaded articulated lorry, carried straight up by rotors.<\/p>\r\n\r\n<p>No helicopter has lifted more, before or since. The aircraft that did it was the Mil V-12, and it is the largest helicopter ever built by a margin that nothing has come close to challenging in fifty-seven years.<\/p>\r\n\r\n\r\n<div style=\"background:#f5f5f5;padding:20px 22px;margin:24px 0;border-radius:8px\"><p style=\"margin:0 0 10px;font-weight:700;font-size:15px;letter-spacing:.04em;text-transform:uppercase;color:#333\">Informations cl\u00e9s<\/p><p style=\"margin:5px 0;font-size:15px\"><strong>Taper:<\/strong> Mil V-12 (production designation Mi-12, NATO: Homer) &mdash; heavy-lift helicopter<\/p><p style=\"margin:5px 0;font-size:15px\"><strong>Mise en page:<\/strong> Two five-blade rotors side by side on inverse-taper wings, cross-shafted<\/p><p style=\"margin:5px 0;font-size:15px\"><strong>Diam\u00e8tre du rotor :<\/strong> 35.0 m each; span across the rotor tips about 67 m &mdash; wider than a Boeing 747<\/p><p style=\"margin:5px 0;font-size:15px\"><strong>Moteurs :<\/strong> Four Soloviev D-25VF turboshafts, roughly 6,500 shp each<\/p><p style=\"margin:5px 0;font-size:15px\"><strong>Weights:<\/strong> Empty about 69,100 kg; maximum take-off 105,000 kg<\/p><p style=\"margin:5px 0;font-size:15px\"><strong>Construit:<\/strong> Two, both of which flew; both wore the registration CCCP-21142<\/p><p style=\"margin:5px 0;font-size:15px\"><strong>Enregistrer:<\/strong> 40,204.5 kg lifted to 2,255 m on 6 August 1969 &mdash; never surpassed<\/p><p style=\"margin:5px 0;font-size:15px\"><strong>Survivants :<\/strong> One at the Mil plant at Panki-Tomilino, one at the Central Air Force Museum, Monino<\/p><\/div>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">Why it has two rotors side by side<\/h2>\r\n\r\n<p>Mil studied the obvious options first. A single main rotor big enough to lift twenty-five tonnes runs into blade and gearbox limits that were not solvable in the 1960s. A tandem layout like the Chinook's does not scale gracefully to that weight either.<\/p>\r\n\r\n<p>The transverse layout solved a different problem: it let Mil take two complete rotor, gearbox and engine assemblies from the existing Mi-6 \u2014 a proven, in-service system \u2014 and mount one at each wingtip. That is an enormous reduction in development risk. It also disposed of the tail rotor, which on a large single-rotor helicopter absorbs power for no lift at all.<\/p>\r\n\r\n<p>The rotors overlap by about three metres and are cross-shafted, so they stay synchronised and so the aircraft stays controllable if an engine fails. The port rotor turns anticlockwise and the starboard clockwise, putting the advancing blades inboard. The stubby wings are inverse-tapered \u2014 wider at the tip than the root \u2014 to sit under the downwash without blanking it.<\/p>\r\n\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img data-opt-id=799467214  fetchpriority=\"high\" decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/ml5psubhxdln.i.optimole.com\/cb:OHOf.cfd2\/w:auto\/h:auto\/q:mauto\/ig:avif\/https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/08\/mil-mi-12-monino-rotor-span-detail-scaled.jpg\" alt=\"The Mil V-12 at Monino, showing the span across its rotor tips\" style=\"width:100%;height:auto;max-width:100%;display:block;border-radius:6px\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">Sixty-seven metres across the rotor tips. A Boeing 747-400 spans about 64. Photo: AviaWiki \/ Wikimedia Commons, CC BY-SA 4.0<\/figcaption><\/figure>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">Un d\u00e9but difficile<\/h2>\r\n\r\n<p>The first flight attempt, on 27 June 1967, ended badly: a control feedback oscillation built up and the aircraft made a hard landing that burst a tyre and bent a wheel hub. Western press reports at the time claimed it had been destroyed. It had not. The first successful flight came on 10 July 1968, from Panki to Lyubertsy, with Vasily Koloshenko at the controls.<\/p>\r\n\r\n\r\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;display:flex;gap:20px;align-items:flex-start\"><div><em>&ldquo;I felt as though I were sailing on a huge ship.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Vasily Koloshenko<\/strong> &mdash; Mil test pilot and commander of the V-12 record flights, Hero of the Soviet Union, as quoted in <em>Aviatsiya Rossii<\/em> (2016)<\/div><\/div><\/div>\r\n\r\n\r\n<p>A second prototype followed in 1973. Those two were the entire production run.<\/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\/yOApFeEgHcE\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;border-radius:8px\" allowfullscreen><\/iframe><\/div>\r\n\r\n\r\n<p style=\"font-size:14px;color:#666;font-style:italic;margin-top:-8px\">Mustard&rsquo;s film on the V-12 &mdash; nearly three million views, and the clearest account of why the layout was chosen.<\/p>\r\n\r\n<h2 style=\"padding-top:22px\">Paris, 1971<\/h2>\r\n\r\n<p>The V-12 flew to the Paris Air Show at Le Bourget in 1971, stopping at Groningen on the way, and was, predictably, the largest thing there. It won the Sikorsky Prize. Mikhail Mil himself never saw it \u2014 he had died in January 1970.<\/p>\r\n\r\n\r\n<div style=\"background:#f8f9fa;border-left:4px solid #1565c0;padding:20px 22px;margin:18px 0 24px;border-radius:0 8px 8px 0;font-size:16px;line-height:1.7;display:flex;gap:20px;align-items:flex-start\"><div><em>&ldquo;Before an engineering achievement such as the V-12 helicopter, one can only take off one&rsquo;s hat.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Sergei Sikorsky<\/strong> &mdash; son of Igor Sikorsky and Sikorsky Aircraft&rsquo;s European representative, on seeing the V-12 at Le Bourget in 1971 (as quoted in Russian sources)<\/div><\/div><\/div>\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=1413577048749129729&theme=light\" style=\"width:100%;height:400px;border:none;border-radius:12px;overflow:hidden\" allowfullscreen><\/iframe><\/div>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">The mission disappeared<\/h2>\r\n\r\n<p>The V-12 existed for one reason: to carry the components of intercontinental ballistic missiles to launch sites in parts of the Soviet Union with no roads and no railways. Its cargo hold was sized around that job \u2014 28 metres long and 4.4 metres square.<\/p>\r\n\r\n<p>Then the requirement evaporated. Solid-fuelled ICBMs on road and rail mobile launchers no longer needed to be flown to remote fixed sites, and reconnaissance satellites had made the concealment argument moot anyway. The air force declined to put the aircraft through state acceptance trials. The Mi-6 and Mi-10 could handle everything the military actually needed lifting, and nothing in the civil economy could justify the running costs.<\/p>\r\n\r\n<p>The programme stopped in 1974. A planned Mi-12M with more powerful engines never got past a mock-up.<\/p>\r\n\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img data-opt-id=694015630  fetchpriority=\"high\" decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/ml5psubhxdln.i.optimole.com\/cb:nyo0.cfd1\/w:auto\/h:auto\/q:mauto\/ig:avif\/https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/08\/mil-v-12-monino-air-force-museum-scaled.jpg\" alt=\"The Mil V-12 preserved at the Central Air Force Museum, Monino\" style=\"width:100%;height:auto;max-width:100%;display:block;border-radius:6px\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">The second prototype at Monino outside Moscow, where it has sat since the programme ended. Photo: Clemens Vasters \/ Wikimedia Commons, CC BY 2.0<\/figcaption><\/figure>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">About that record<\/h2>\r\n\r\n<p>One point of care, because it is widely misreported. Many sources \u2014 including Russian-language ones and parts of Wikipedia's own prose \u2014 give the payload as 44,205 kg. The FAI's record file and Wikipedia's specification table both give 40,204.5 kg. Use the lower figure.<\/p>\r\n\r\n<p>A second point: it is accurate to say no helicopter has ever lifted more. It is not accurate to say the record still stands as a current FAI record, because the FAI has since retired or superseded those particular categories in a rules change. The achievement is untouched; the paperwork has moved on.<\/p>\r\n\r\n<p>And a sanity check worth making, since the numbers get quoted loosely: 69,100 kg empty plus a 40-tonne payload comes to more than the 105,000 kg maximum take-off weight, before fuel. The record flight was an overload attempt. Normal cabin payload was around 25 tonnes.<\/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\/kKsWTdjnXiw\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;border-radius:8px\" allowfullscreen><\/iframe><\/div>\r\n\r\n\r\n<p style=\"font-size:14px;color:#666;font-style:italic;margin-top:-8px\">Period Soviet footage of the V-12 flying &mdash; worth watching for the sheer implausibility of it leaving the ground.<\/p>\r\n\r\n<p>Two were built. Neither entered service. One record was set, and it has outlasted the country that set it. Somewhere at Panki-Tomilino, the first one is still sitting outside \u2014 the largest helicopter anyone has ever managed to fly, built for a job that stopped existing before it was finished.<\/p>\r\n\r\n<p><em>Sources: Gordon &amp; Komissarov, <\/em>Mil&rsquo;s Heavylift Helicopters<em> (Red Star 22, 2005); FAI record files 9916, 9917 and 9937 (archived); Vertical Flight Society Vertipedia; <\/em>Aviatsiya Rossii<em>, 2016; Jane&rsquo;s All the World&rsquo;s Aircraft 1975&ndash;76; Wikipedia cross-checks.<\/em><\/p>\r\n\r\n\r\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\">Articles similaires<\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/fr\/ch-53k-king-stallion-most-powerful-us-helicopter\/\">The Helicopter That Lifted Another Helicopter<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/fr\/kalinine-k-7-moteur-sovietique-geant\/\">Le Kalinin K-7 : le g\u00e9ant \u00e0 sept moteurs de Staline<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/fr\/antonov-un-turbopropulseur-de-22-ans-plus-gros\/\">Le plus gros turbopropulseur jamais construit<\/a><\/p><\/div>","protected":false},"excerpt":{"rendered":"<p>Two rotors side by side, sixty-seven metres across the tips, and forty tonnes lifted to 2,255 metres in 1969. No helicopter has lifted more since. Only two were ever built.<\/p>","protected":false},"author":23,"featured_media":17423036,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[665,666],"tags":[],"class_list":["post-17423521","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 v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Mil V-12: The Largest Helicopter Ever Built | MiGFlug<\/title>\n<meta name=\"description\" content=\"The Mil V-12 lifted 40 tonnes to 2,255 metres in 1969. 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