{"id":11493534,"date":"2026-08-12T11:04:56","date_gmt":"2026-08-12T09:04:56","guid":{"rendered":"https:\/\/migflug.com\/jetflights\/handley-page-hp-115-slender-delta-concorde\/"},"modified":"2026-08-12T11:20:44","modified_gmt":"2026-08-12T09:20:44","slug":"handley-page-hp-115-slender-delta-concorde","status":"publish","type":"post","link":"https:\/\/migflug.com\/jetflights\/it\/handley-page-hp-115-slender-delta-concorde\/","title":{"rendered":"HP.115, Slender Delta That Proved Concorde&#8217;s Wing"},"content":{"rendered":"<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style><p>It looks like a paper dart that a child drew and an engineer took seriously. A long needle nose, a huge triangular wing, spindly stalk-like landing gear, and a single small jet perched at the base of the fin. The Handley Page HP.115 was one of the strangest and most important aircraft Britain ever built.<\/p><p>In the 1950s, planners chasing a supersonic airliner hit a wall. The very slender delta wing that behaves beautifully at supersonic speed threatened to be a death trap at landing speed. Wind tunnels could only argue about it. Someone had to fly it.<\/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\">INFORMAZIONI RAPIDE<\/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\">Tipo<\/td><td style=\"padding:6px 0;color:#444\">Slender-delta low-speed research aircraft<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;font-weight:600;color:#333;vertical-align:top;white-space:nowrap\">Primo volo<\/td><td style=\"padding:6px 0;color:#444\">17 August 1961<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;font-weight:600;color:#333;vertical-align:top;white-space:nowrap\">Ruolo<\/td><td style=\"padding:6px 0;color:#444\">Low-speed delta research for supersonic transport<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;font-weight:600;color:#333;vertical-align:top;white-space:nowrap\">centrale elettrica<\/td><td style=\"padding:6px 0;color:#444\">1 x Bristol Siddeley Viper turbojet<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;font-weight:600;color:#333;vertical-align:top;white-space:nowrap\">Velocit\u00e0 massima<\/td><td style=\"padding:6px 0;color:#444\">248 mph (399 km\/h)<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;font-weight:600;color:#333;vertical-align:top;white-space:nowrap\">Numero costruito<\/td><td style=\"padding:6px 0;color:#444\">1 (serial XP841)<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;font-weight:600;color:#333;vertical-align:top;white-space:nowrap\">Destino<\/td><td style=\"padding:6px 0;color:#444\">Retired 1974; preserved at the Fleet Air Arm Museum<\/td><\/tr><\/table><\/div>\r\n<h2 style=\"padding-top:22px\">Chasing a vortex<\/h2><p>Royal Aircraft Establishment researchers, building on the work of Dietrich K\u00fcchemann and Johanna Weber, realised a sharply swept delta sheds powerful vortices at low speed that suck extra lift from the air above the wing. The HP.115 was built to test that idea for real, with a wing swept back a dramatic 75 degrees.<\/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\/E_1C4Ct2MaE\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;border-radius:8px\" allowfullscreen><\/iframe><\/div>\r\n<p>On 17 August 1961 test pilot Jack Henderson lifted XP841 off at RAE Bedford and came back grinning. Far from being lethally twitchy, the little jet was docile. Pilots could roll it hard from bank to bank while crawling through the air at just 69 mph, a fraction of the landing speed of a fast jet.<\/p>\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img data-opt-id=1965414850  fetchpriority=\"high\" decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/ml5psubhxdln.i.optimole.com\/cb:EYcJ.cc57\/w:auto\/h:auto\/q:mauto\/ig:avif\/https:\/\/migflug.com\/jetflights\/wp-content\/uploads\/sites\/4\/2026\/08\/handley-page-hp-115-slender-delta-concorde-1.jpg\" alt=\"Handley Page HP.115 slender-delta research aircraft\" 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 HP.115: a needle nose, a 75-degree delta wing, and one small jet. Photo: Wikimedia Commons<\/figcaption><\/figure>\r\n<h2 style=\"padding-top:22px\">The needle that pointed to Concorde<\/h2><p>For thirteen years the HP.115 quietly gathered the low-speed data that a supersonic transport would need on takeoff and landing. Its findings, paired with high-speed work by the BAC 221, helped convince engineers that a slender delta could be trusted. That confidence flowed straight into Concorde.<\/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;The HP.115 demonstrated controlled flight and rapid banking at speeds as low as about 69 mph.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Notizie sull&#039;aviazione d&#039;epoca<\/strong> &mdash; aviation-history publication<\/div><\/div><\/div>\r\n<p>By 1974 XP841 had reached its design life of around 500 flight hours and was retired from research flying.<\/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\/HANKpeHBC3U\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;border-radius:8px\" allowfullscreen><\/iframe><\/div>\r\n<p>One aircraft. One engine. One idea, proved. XP841 now sits beside a Concorde nose at the Fleet Air Arm Museum, the humble needle next to the airliner it helped make possible.<\/p>\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img data-opt-id=165095054  fetchpriority=\"high\" decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/ml5psubhxdln.i.optimole.com\/cb:EYcJ.cc57\/w:auto\/h:auto\/q:mauto\/ig:avif\/https:\/\/migflug.com\/jetflights\/wp-content\/uploads\/sites\/4\/2026\/08\/handley-page-hp-115-slender-delta-concorde-2.jpg\" alt=\"Preserved Handley Page HP.115\" 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\">XP841 preserved. Its low-speed data helped make Concorde possible. 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;Pilot J.M. Henderson reported his enthusiasm after the HP.115's maiden flight in August 1961.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Fleet Air Arm Museum<\/strong> &mdash; collection record<\/div><\/div><\/div>\r\n<p>A short history of the fragile little delta that de-risked Concorde:<\/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\/YAI0vzwCLg0\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;border-radius:8px\" allowfullscreen><\/iframe><\/div>\r\n<p><em>Sources: Fleet Air Arm Museum; Vintage Aviation News; Wikipedia.<\/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\">Post correlati<\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/jetflights\/douglas-x-3-stiletto-mach-2-research-jet-too-slow\/\">Progettato per Mach 2, troppo lento per arrivarci.<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/jetflights\/the-tsr-2-the-best-british-aircraft-that-never-served\/\">Il TSR-2: il miglior aereo britannico che non ha mai prestato servizio<\/a><\/p><\/div>","protected":false},"excerpt":{"rendered":"<p>It looks like a paper dart that a child drew and an engineer took seriously. A long needle nose, a huge triangular wing, spindly stalk-like landing gear, and a single small jet perched at the base of the fin. The Handley Page HP.115 was one of the strangest and most important aircraft Britain ever built. [&hellip;]<\/p>\n","protected":false},"author":27,"featured_media":11493549,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[665],"tags":[],"class_list":["post-11493534","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aviation-world"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Handley Page HP.115: Slender Delta Testbed<\/title>\n<meta name=\"description\" content=\"The Handley Page HP.115 was a slender delta research jet that proved the low-speed wing later trusted on Concorde. 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