{"id":11493749,"date":"2026-08-12T11:05:51","date_gmt":"2026-08-12T09:05:51","guid":{"rendered":"https:\/\/migflug.com\/jetflights\/bristol-188-stainless-steel-flaming-pencil\/"},"modified":"2026-08-12T11:21:33","modified_gmt":"2026-08-12T09:21:33","slug":"bristol-188-stainless-steel-flaming-pencil","status":"publish","type":"post","link":"https:\/\/migflug.com\/jetflights\/es\/bristol-188-stainless-steel-flaming-pencil\/","title":{"rendered":"Bristol 188, Stainless Steel Flaming Pencil"},"content":{"rendered":"<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style><p>On the ground it gleamed like cutlery. Long, thin and unpainted, its polished skin caught the Filton light, and its shape earned it a nickname that stuck for life: the Flaming Pencil. The Bristol 188 was Britain's bold, doomed attempt to fly through the thermal barrier.<\/p><p>The problem it chased was heat. Past Mach 2, friction with the air cooks an airframe until ordinary aluminium softens. To survive it, Bristol did something almost nobody had tried: it welded the fuselage from stainless steel, using an exotic argon-shielded puddle-welding technique developed for the job.<\/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\">DATOS R\u00c1PIDOS<\/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\">Stainless-steel supersonic research aircraft<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;font-weight:600;color:#333;vertical-align:top;white-space:nowrap\">Primer vuelo<\/td><td style=\"padding:6px 0;color:#444\">14 April 1962<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;font-weight:600;color:#333;vertical-align:top;white-space:nowrap\">Role<\/td><td style=\"padding:6px 0;color:#444\">Kinetic-heating and high-speed research<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;font-weight:600;color:#333;vertical-align:top;white-space:nowrap\">Central el\u00e9ctrica<\/td><td style=\"padding:6px 0;color:#444\">2 x de Havilland Gyron Junior afterburning turbojets<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;font-weight:600;color:#333;vertical-align:top;white-space:nowrap\">Velocidad m\u00e1xima<\/td><td style=\"padding:6px 0;color:#444\">Mach 1.88 reached (Mach 2 goal)<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;font-weight:600;color:#333;vertical-align:top;white-space:nowrap\">N\u00famero construido<\/td><td style=\"padding:6px 0;color:#444\">3 (2 flightworthy)<\/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\">Cancelled 1964; XF926 preserved at RAF Museum Cosford<\/td><\/tr><\/table><\/div>\r\n<h2 style=\"padding-top:22px\">Built to soak in heat<\/h2><p>The idea was to fly fast for long enough that the whole structure heated through, then measure how the steel airframe coped. Everything was aimed at that goal, from a fused-quartz windscreen to a cockpit refrigeration system, feeding data to a ground station in real time.<\/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\/ivf4mXaqME8\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;border-radius:8px\" allowfullscreen><\/iframe><\/div>\r\n<p>The trouble was the engines. Two de Havilland Gyron Junior turbojets drank fuel so greedily that around 70 percent of the aircraft's fuel was gone just reaching test altitude. A typical flight lasted only around 25 minutes, nowhere near long enough to let the steel soak up the heat it was built to study.<\/p>\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img data-opt-id=390333148  fetchpriority=\"high\" decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/ml5psubhxdln.i.optimole.com\/cb:jTmv.cc58\/w:auto\/h:auto\/q:mauto\/ig:avif\/https:\/\/migflug.com\/jetflights\/wp-content\/uploads\/sites\/4\/2026\/08\/bristol-188-stainless-steel-flaming-pencil-1.jpg\" alt=\"Bristol Type 188 XF926 preserved at Cosford\" 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\">XF926, the surviving Bristol 188, preserved at RAF Museum Cosford. Photo: Wikimedia Commons<\/figcaption><\/figure>\r\n<h2 style=\"padding-top:22px\">Fastest failure in Britain<\/h2><p>Across 51 flights the 188 clawed its way to Mach 1.88, short of its Mach 2 target and never held long enough to matter. Chief test pilot Godfrey Auty found it went supersonic smoothly, but the engines surged beyond it, kicking the jet in pitch and yaw.<\/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 Type 188 reached Mach 1.88, but its thirsty Gyron Junior engines never let it sustain the high-speed thermal tests it was designed for.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>RAF Museum<\/strong> &mdash; museum record<\/div><\/div><\/div>\r\n<p>By 1964 it was over. The programme had cost around \u00a320 million, the most expensive British research aircraft of its day, and delivered inconclusive answers. Concorde was ultimately built from aluminium and capped at Mach 2.2.<\/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\/tBwSKC8yws4\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;border-radius:8px\" allowfullscreen><\/iframe><\/div>\r\n<p>Yet the Flaming Pencil was not wasted. Its lessons in steel, heat and the Gyron Junior fed into later programmes. Today XF926 rests at RAF Museum Cosford, a beautiful, honest monument to an experiment that reached too far.<\/p>\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img data-opt-id=505398581  fetchpriority=\"high\" decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/ml5psubhxdln.i.optimole.com\/cb:jTmv.cc58\/w:auto\/h:auto\/q:mauto\/ig:avif\/https:\/\/migflug.com\/jetflights\/wp-content\/uploads\/sites\/4\/2026\/08\/bristol-188-stainless-steel-flaming-pencil-2.jpg\" alt=\"Bristol 188 stainless-steel 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 polished stainless-steel skin that gave the 188 its Flaming Pencil nickname. 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;The stainless-steel Bristol 188, the Flaming Pencil, was Britain's costly bid to probe kinetic heating beyond Mach 2.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Key.Aero<\/strong> &mdash; aviation publication<\/div><\/div><\/div>\r\n<p>The Flaming Pencil: supersonic stainless steel that burned fuel faster than data:<\/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\/9Pptd90Ihls\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;border-radius:8px\" allowfullscreen><\/iframe><\/div>\r\n<p><em>Sources: RAF Museum; Key.Aero; 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\">Publicaciones relacionadas<\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/jetflights\/douglas-x-3-stiletto-mach-2-research-jet-too-slow\/\">Dise\u00f1ado para Mach 2, demasiado lento para llegar all\u00ed.<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/jetflights\/bell-x-2-starbuster-mach-3-apt-kincheloe\/\">Mach 3 y el precio que pag\u00f3 el X-2<\/a><\/p><\/div>","protected":false},"excerpt":{"rendered":"<p>On the ground it gleamed like cutlery. Long, thin and unpainted, its polished skin caught the Filton light, and its shape earned it a nickname that stuck for life: the Flaming Pencil. The Bristol 188 was Britain&#8217;s bold, doomed attempt to fly through the thermal barrier. The problem it chased was heat. Past Mach 2, [&hellip;]<\/p>\n","protected":false},"author":24,"featured_media":11493764,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[665],"tags":[],"class_list":["post-11493749","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>Bristol 188: Stainless Steel Flaming Pencil<\/title>\n<meta name=\"description\" content=\"The Bristol 188 was a stainless steel Mach 2 research jet nicknamed the Flaming Pencil. 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