{"id":11491698,"date":"2026-08-12T10:55:35","date_gmt":"2026-08-12T08:55:35","guid":{"rendered":"https:\/\/migflug.com\/jetflights\/lockheed-ah-56-cheyenne\/"},"modified":"2026-08-12T11:13:53","modified_gmt":"2026-08-12T09:13:53","slug":"lockheed-ah-56-cheyenne","status":"publish","type":"post","link":"https:\/\/migflug.com\/jetflights\/fr\/lockheed-ah-56-cheyenne\/","title":{"rendered":"L&#039;avion de combat Lockheed de 386 km\/h que l&#039;arm\u00e9e redoutait"},"content":{"rendered":"<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style><p>At an airshow in December 1967, the Lockheed AH-56 Cheyenne did something helicopters were not supposed to do. It bowed. Landing on its two forward wheels, it dipped its nose to the crowd, then gently set its tail down and taxied away. The trick was the pusher propeller on its tail, and it hinted at just how radical this machine really was.<\/p><p>Born from the Army's Advanced Aerial Fire Support System program, the Cheyenne was a compound helicopter: a rigid four-blade main rotor for lift, stub wings to offload it at speed, and a pusher prop at the back to shove it forward. At high speed the wings and propeller took the strain, and the rotor carried only a fraction of the lift. It could out-run anything else with a rotor.<\/p>\r\n<div style=\"background:#f5f5f5;padding:20px 24px;margin:24px 0;border-radius:8px\"><p style=\"margin:0 0 10px;font-weight:700;font-size:15px;letter-spacing:.04em;color:#5C91FF\">FAITS RAPIDES<\/p><table style=\"width:100%;border-collapse:collapse;font-size:15px\"><tr><td style=\"padding:6px 14px 6px 0;font-weight:600;color:#333;vertical-align:top;white-space:nowrap\">Taper<\/td><td style=\"padding:6px 0;color:#444\">Compound attack helicopter prototype<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;font-weight:600;color:#333;vertical-align:top;white-space:nowrap\">Premier vol<\/td><td style=\"padding:6px 0;color:#444\">21 September 1967<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;font-weight:600;color:#333;vertical-align:top;white-space:nowrap\">centrale \u00e9lectrique<\/td><td style=\"padding:6px 0;color:#444\">1 x General Electric T64 turboshaft (up to 4,275 shp)<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;font-weight:600;color:#333;vertical-align:top;white-space:nowrap\">Rotors<\/td><td style=\"padding:6px 0;color:#444\">4-blade rigid main, 4-blade tail, 3-blade pusher prop<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;font-weight:600;color:#333;vertical-align:top;white-space:nowrap\">vitesse maximale<\/td><td style=\"padding:6px 0;color:#444\">244 mph level; 282 mph in a dive<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;font-weight:600;color:#333;vertical-align:top;white-space:nowrap\">Nombre construit<\/td><td style=\"padding:6px 0;color:#444\">10 prototypes<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;font-weight:600;color:#333;vertical-align:top;white-space:nowrap\">Destin<\/td><td style=\"padding:6px 0;color:#444\">Cancelled 9 August 1972; never entered service<\/td><\/tr><\/table><\/div>\r\n<h2 style=\"padding-top:22px\">Fast, deadly, and complicated<\/h2><p>The two-man crew sat in tandem, the gunner up front in a seat that physically rotated to follow the belly turret's 30 mm cannon, the pilot behind with a helmet sight. It could carry TOW anti-tank missiles and rocket pods, and in its final form it screamed to 244 mph in level flight and 282 mph in a dive, numbers a conventional gunship could only dream of.<\/p>\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\/Wm2hW0XjTDs\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;border-radius:8px\" allowfullscreen><\/iframe><\/div>\r\n<p>But brilliance had a price. The rigid rotor was prone to a vibration the engineers called half-P hop. In March 1969 that gremlin turned lethal: the rotor on prototype three struck the fuselage and the aircraft crashed, killing test pilot David A. Beil.<\/p>\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img data-opt-id=137878303  fetchpriority=\"high\" decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" 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\/08\/lockheed-ah-56-cheyenne-1.jpg\" alt=\"Lockheed AH-56A Cheyenne attack helicopter\" 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 AH-56A Cheyenne: a rigid-rotor gunship with stub wings and a tail pusher propeller. Photo: U.S. Army<\/figcaption><\/figure>\r\n<h2 style=\"padding-top:22px\">Killed by rivals and time<\/h2><p>A second airframe was later destroyed in a wind-tunnel accident. The Army cancelled the production contract in May 1969, kept development alive, then watched the Air Force wage a turf war over who should fly close air support at all.<\/p>\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;Developed to redefine battlefield air support, the Lockheed AH-56 Cheyenne combined unprecedented speed, heavy firepower, and advanced rotor technology.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Actualit\u00e9s de l&#039;aviation vintage<\/strong> \u2014 publication sur l&#039;histoire de l&#039;aviation<\/div><\/div><\/div>\r\n<p>By 1972 the simpler AH-1 Cobra was already proven in Vietnam with the TOW missile, and the Army wanted a twin-engine, more survivable machine. On 9 August 1972 the Cheyenne was cancelled for good, after just ten prototypes.<\/p>\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\/9fd9QHjmPbg\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;border-radius:8px\" allowfullscreen><\/iframe><\/div>\r\n<p>The irony stings. Weeks later the Army launched the program that produced the AH-64 Apache, and decades later Sikorsky's rigid-rotor speedsters would chase the very numbers the Cheyenne hit in 1967. It was not a bad helicopter. It was simply too soon.<\/p>\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img data-opt-id=638816102  fetchpriority=\"high\" decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" 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\/08\/lockheed-ah-56-cheyenne-2.jpg\" alt=\"AH-56A Cheyenne parked, showing pusher prop and stub wings\" 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\">On the ramp, the pusher prop and stub wings that let the Cheyenne out-run every other helicopter. Photo: Wikimedia Commons<\/figcaption><\/figure>\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;Technical setbacks, escalating costs, and changing US military priorities led to its cancellation before it entered service.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Actualit\u00e9s de l&#039;aviation vintage<\/strong> \u2014 publication sur l&#039;histoire de l&#039;aviation<\/div><\/div><\/div>\r\n<p>The rise and fall of the attack helicopter that arrived twenty years early:<\/p>\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\/N5cbdbjwP8E\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;border-radius:8px\" allowfullscreen><\/iframe><\/div>\r\n<p><em>Sources: Vintage Aviation News; Wikipedia; U.S. Army.<\/em><\/p>\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\/jetflights\/ryan-x-13-vertijet-tailsitter-history\/\">L&#039;avion qui a d\u00e9coll\u00e9, accroch\u00e9 \u00e0 un crochet<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/jetflights\/rockwell-xfv-12-vtol-fighter-that-couldnt-hover\/\">Le chasseur VTOL qui ne pouvait pas d\u00e9coller tout seul<\/a><\/p><\/div>","protected":false},"excerpt":{"rendered":"<p>At an airshow in December 1967, the Lockheed AH-56 Cheyenne did something helicopters were not supposed to do. It bowed. Landing on its two forward wheels, it dipped its nose to the crowd, then gently set its tail down and taxied away. The trick was the pusher propeller on its tail, and it hinted at [&hellip;]<\/p>\n","protected":false},"author":24,"featured_media":11491707,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[664],"tags":[],"class_list":["post-11491698","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-military-aviation"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Lockheed AH-56 Cheyenne: The Gunship Too Advanced<\/title>\n<meta name=\"description\" content=\"The AH-56 Cheyenne was Lockheed&#039;s rigid-rotor, pusher-prop attack helicopter that hit 240 mph in 1967 and was cancelled in 1972. 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