{"id":11494105,"date":"2026-08-12T11:07:26","date_gmt":"2026-08-12T09:07:26","guid":{"rendered":"https:\/\/migflug.com\/jetflights\/convair-xp-81-turboprop-escort-fighter\/"},"modified":"2026-08-12T11:22:19","modified_gmt":"2026-08-12T09:22:19","slug":"convair-xp-81-chasseur-descorte-a-turbopropulseurs","status":"publish","type":"post","link":"https:\/\/migflug.com\/afterburner\/fr\/convair-xp-81-turboprop-escort-fighter\/","title":{"rendered":"XP-81, le premier chasseur d&#039;escorte \u00e0 turbopropulseurs am\u00e9ricain"},"content":{"rendered":"<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style><p>Vue de face, elle ressemble \u00e0 un Mustang qui aurait pris un festin. Une h\u00e9lice quadripale, un nez long et fin, une verri\u00e8re en forme de bulle. Puis on remarque les tuy\u00e8res \u00e0 l&#039;arri\u00e8re, et le Convair XP-81 perd tout son sens, pour notre plus grand plaisir. C&#039;\u00e9tait un chasseur dot\u00e9 de deux types de moteurs, un \u00e0 l&#039;avant et un \u00e0 l&#039;arri\u00e8re.<\/p><p>Le probl\u00e8me r\u00e9sidait dans l&#039;autonomie. L&#039;arm\u00e9e souhaitait un chasseur capable d&#039;escorter les bombardiers B-29 au-del\u00e0 du Pacifique, ce qui impliquait une faible autonomie et une vitesse suffisante pour remporter les combats, le tout dans un seul appareil. Aucun moteur de l&#039;\u00e9poque ne r\u00e9unissait ces deux qualit\u00e9s\u00a0; Convair en utilisa donc deux.<\/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\">chasseur d&#039;escorte hybride turbopropulseur\/turbor\u00e9acteur<\/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\">11 f\u00e9vrier 1945 (\u00e0 bord d&#039;un Merlin de remplacement)<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;font-weight:600;color:#333;vertical-align:top;white-space:nowrap\">R\u00f4le<\/td><td style=\"padding:6px 0;color:#444\">Chasseur d&#039;escorte B-29 \u00e0 long rayon d&#039;action<\/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 turbopropulseur GE (nez) + 1 turbor\u00e9acteur J33 (queue)<\/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\">Environ 507 mph (estimation)<\/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\">2 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\">Annul\u00e9 en 1947\u00a0; les deux exemplaires sont conserv\u00e9s au Mus\u00e9e national de l\u2019USAF.<\/td><\/tr><\/table><\/div>\r\n<h2 style=\"padding-top:22px\">H\u00e9lice pour la croisi\u00e8re, r\u00e9acteur pour le combat<\/h2><p>Un turbopropulseur General Electric \u00e0 l&#039;avant entra\u00eenait l&#039;h\u00e9lice pour un vol de croisi\u00e8re long-courrier efficace. Un turbor\u00e9acteur J33, \u00e9galement con\u00e7u par GE, \u00e0 l&#039;arri\u00e8re, s&#039;allumait pour une acc\u00e9l\u00e9ration fulgurante au-dessus de la cible. C&#039;\u00e9tait une solution ing\u00e9nieuse pour faire la transition entre l&#039;\u00e8re des moteurs \u00e0 pistons et celle des moteurs \u00e0 r\u00e9action.<\/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\/Gf_FgA4T2z0\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;border-radius:8px\" allowfullscreen><\/iframe><\/div>\r\n<p>La r\u00e9alit\u00e9 a rattrap\u00e9 l&#039;appareil. Le turbopropulseur n&#039;\u00e9tant pas pr\u00eat, les ing\u00e9nieurs ont install\u00e9 un moteur Packard Merlin de P-51 \u00e0 l&#039;avant pour pouvoir voler. Le 11 f\u00e9vrier 1945, le XP-81, propuls\u00e9 par le Merlin, a d\u00e9coll\u00e9 de Muroc et s&#039;est comport\u00e9 correctement, une fois qu&#039;un empennage plus large a corrig\u00e9 un l\u00e9ger balancement d\u00fb \u00e0 la longueur du fuselage avant.<\/p>\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img data-opt-id=771147449  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\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/08\/convair-xp-81-turboprop-escort-fighter-1.jpg\" alt=\"Vue de face du Convair XP-81 montrant l&#039;h\u00e9lice avant\" 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\">H\u00e9lice \u00e0 l&#039;avant, r\u00e9acteur \u00e0 l&#039;arri\u00e8re\u00a0: la double personnalit\u00e9 du XP-81. Photo\u00a0: US Air Force<\/figcaption><\/figure>\r\n<h2 style=\"padding-top:22px\">Premier sur la puissance des turbopropulseurs<\/h2><p>Fin 1945, le v\u00e9ritable turbopropulseur fut enfin install\u00e9, et le 21 d\u00e9cembre, le XP-81 devint le premier avion am\u00e9ricain \u00e0 voler gr\u00e2ce \u00e0 cette motorisation. Cependant, le moteur ne d\u00e9livra jamais la puissance promise, n&#039;offrant pas plus que le Merlin, et les gains de performance escompt\u00e9s furent vains.<\/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>\u201c Le XP-81 fut le premier avion am\u00e9ricain \u00e0 voler propuls\u00e9 par un moteur turbopropulseur. \u201d<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Mus\u00e9e national de l&#039;USAF<\/strong> \u2014 fiche d&#039;information du mus\u00e9e<\/div><\/div><\/div>\r\n<p>La guerre termin\u00e9e et les bases du Pacifique conquises, le besoin d&#039;une escorte \u00e0 long rayon d&#039;action disparut. Le programme fut annul\u00e9 en 1947 apr\u00e8s la construction de deux prototypes, lesquels servirent par la suite de cibles sur un champ de tir.<\/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\/yDbEXoxm1Ec\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;border-radius:8px\" allowfullscreen><\/iframe><\/div>\r\n<p>Tous deux ont surv\u00e9cu \u00e0 cette humiliation. Aujourd&#039;hui, les deux cellules du XP-81 reposent au Mus\u00e9e national de l&#039;US Air Force, un prototype hybride qui a vu le jour juste au moment o\u00f9 le monde pour lequel il avait \u00e9t\u00e9 con\u00e7u disparaissait.<\/p>\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img data-opt-id=258978230  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\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/08\/convair-xp-81-turboprop-escort-fighter-2.jpg\" alt=\"Convair XP-81 en vol\" 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\">Le XP-81 en vol. Le 21 d\u00e9cembre 1945, il devint le premier avion am\u00e9ricain \u00e0 voler gr\u00e2ce \u00e0 un turbopropulseur. Photo : US Air Force<\/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>\u201c Le XP-81 \u00e9tait con\u00e7u pour combiner la vitesse d&#039;un avion \u00e0 r\u00e9action et l&#039;autonomie d&#039;un avion \u00e0 h\u00e9lice afin de r\u00e9pondre aux exigences d&#039;une mission d&#039;escorte d&#039;environ 1 250 miles. \u201d<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>White Eagle Aerospace<\/strong> \u2014 site d&#039;histoire de l&#039;aviation<\/div><\/div><\/div>\r\n<p>Le chasseur d&#039;escorte hybride arriv\u00e9 juste au moment o\u00f9 sa mission disparaissait :<\/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\/QX1OrMEs8Qg\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;border-radius:8px\" allowfullscreen><\/iframe><\/div>\r\n<p><em>Sources\u00a0: Mus\u00e9e national de l\u2019USAF\u00a0; White Eagle Aerospace\u00a0; Wikip\u00e9dia.<\/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\/afterburner\/fr\/lockheed-xfv-1-salmon-tailsitter-vtol-fighter\/\">Le chasseur de la Marine qui n&#039;a jamais d\u00e9coll\u00e9 \u00e0 la verticale<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/fr\/vought-xf5u-flying-pancake-navy-fighter\/\">Flying Pancake : le chasseur de la Marine qui n&#039;a jamais vol\u00e9<\/a><\/p><\/div>","protected":false},"excerpt":{"rendered":"<p>From the front it looks like a Mustang that ate a bigger meal. A four-bladed propeller, a long slim nose, a bubble canopy. Then you notice the jet exhaust at the tail, and the Convair XP-81 stops making sense in the best possible way. This was a fighter with two kinds of engine, front and [&hellip;]<\/p>\n","protected":false},"author":23,"featured_media":11494113,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[664],"tags":[],"class_list":["post-11494105","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 v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Convair XP-81: Turboprop Escort Fighter<\/title>\n<meta name=\"description\" content=\"The Convair XP-81 was a hybrid turboprop and turbojet escort fighter, the first US aircraft to fly on turboprop power. 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