{"id":18855274,"date":"2026-09-01T11:21:04","date_gmt":"2026-09-01T09:21:04","guid":{"rendered":"https:\/\/migflug.com\/afterburner\/shinmaywa-us-2-amphibious-rescue-flying-boat-explained\/"},"modified":"2026-09-01T11:21:31","modified_gmt":"2026-09-01T09:21:31","slug":"shinmaywa-us-2-amphibious-rescue-flying-boat-explained","status":"publish","type":"post","link":"https:\/\/migflug.com\/afterburner\/fr\/shinmaywa-us-2-amphibious-rescue-flying-boat-explained\/","title":{"rendered":"ShinMaywa US-2: The Flying Boat That Lands in 3-Metre Waves"},"content":{"rendered":"<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style>\r\n<p>On 21 June 2013, a yacht called Eolus struck a sperm whale roughly 1,200 kilometres south-east of Miyagi prefecture and began to sink. Two men took to a life raft: a Japanese newscaster and a blind sailor attempting to cross the Pacific.<\/p><p>A US-2 launched from Iwakuni at 11:39 and turned back. The sea was too rough even for this aircraft. A second launched at 15:08, landed on the open ocean, and had both men aboard by 18:14.<\/p><p>There is no helicopter with that reach and no other fixed-wing aircraft that can land out there to use it. The ShinMaywa US-2 exists to occupy that gap, and it is the only aircraft in the world currently doing so.<\/p>\r\n<div style=\"background:#f5f5f5;padding:20px 22px;margin:26px 0;border-left:4px solid #5C91FF\"><p style=\"margin:0 0 10px;font-weight:700;font-size:17px;color:#222\">Informations cl\u00e9s<\/p><table style=\"width:100%;border-collapse:collapse;font-size:15px;line-height:1.6\"><tr><td style=\"padding:6px 14px 6px 0;color:#555;white-space:normal;vertical-align:top;min-width:130px\"><strong>Role and operator<\/strong><\/td><td style=\"padding:6px 0;white-space:normal\">STOL amphibious search-and-rescue flying boat; JMSDF 71st Air Rescue Squadron, Iwakuni<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;color:#555;white-space:normal;vertical-align:top;min-width:130px\"><strong>First flight and service entry<\/strong><\/td><td style=\"padding:6px 0;white-space:normal\">18 December 2003, entering service 30 March 2007<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;color:#555;white-space:normal;vertical-align:top;min-width:130px\"><strong>centrale \u00e9lectrique<\/strong><\/td><td style=\"padding:6px 0;white-space:normal\">Four Rolls-Royce AE 2100J of 4,591 shp each, driving six-blade Dowty propellers<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;color:#555;white-space:normal;vertical-align:top;min-width:130px\"><strong>The fifth engine<\/strong><\/td><td style=\"padding:6px 0;white-space:normal\">A separate LHTEC CTS800 turboshaft driving a dedicated compressor for boundary layer control<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;color:#555;white-space:normal;vertical-align:top;min-width:130px\"><strong>Blown flaps<\/strong><\/td><td style=\"padding:6px 0;white-space:normal\">Deflect to 60 degrees<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;color:#555;white-space:normal;vertical-align:top;min-width:130px\"><strong>Minimum controllable speed<\/strong><\/td><td style=\"padding:6px 0;white-space:normal\">About 50 knots, roughly 90 km\/h<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;color:#555;white-space:normal;vertical-align:top;min-width:130px\"><strong>Water performance<\/strong><\/td><td style=\"padding:6px 0;white-space:normal\">Lift-off in 280 m, landing in 330 m at 43 tonnes<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;color:#555;white-space:normal;vertical-align:top;min-width:130px\"><strong>Sea state<\/strong><\/td><td style=\"padding:6px 0;white-space:normal\">Certified to land in waves up to 3 m<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;color:#555;white-space:normal;vertical-align:top;min-width:130px\"><strong>Range and radius<\/strong><\/td><td style=\"padding:6px 0;white-space:normal\">4,700 km range, 1,900 km radius of action, maximum 315 kt<\/td><\/tr><tr><td style=\"padding:6px 14px 6px 0;color:#555;white-space:normal;vertical-align:top;min-width:130px\"><strong>\u00c9quipage<\/strong><\/td><td style=\"padding:6px 0;white-space:normal\">Eleven, including three divers and two paramedics<\/td><\/tr><\/table><\/div>\r\n<h2 style=\"padding-top:22px\">The problem it solves<\/h2><p>Ocean rescue has an ugly geometry. A helicopter can hover over a life raft but cannot reach far offshore. A long-range aircraft can reach the raft in hours but can only circle above it and drop equipment.<\/p><p>Japan has a great deal of ocean and a search-and-rescue region that extends well past helicopter range, so the JMSDF kept alive a capability almost everyone else abandoned: an aeroplane that flies out at 300 knots and then lands on the sea.<\/p>\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img data-opt-id=953074106  fetchpriority=\"high\" decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/ml5psubhxdln.i.optimole.com\/cb:yHTS.d03b\/w:auto\/h:auto\/q:mauto\/ig:avif\/https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/09\/shinmaywa-us-2-afloat-open-ocean-cope-north-2022.jpg\" alt=\"ShinMaywa US-2 afloat on the open ocean during Cope North 2022\" style=\"width:100%;height:auto;max-width:100%;display:block\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">A US-2 shut down and afloat on the open ocean off Tinian. This, rather than any performance figure, is the capability nothing else offers. Photo: US Department of Defense<\/figcaption><\/figure>\r\n<p>The difficulty is that these are contradictory requirements. Landing on water in a seaway demands the slowest possible touchdown speed, because waves do not flatten out for you. Getting there quickly demands a wing built for cruise. The US-2&rsquo;s answer is to cheat, using an entire additional engine.<\/p><h2 style=\"padding-top:22px\">The fifth engine<\/h2><p>Four Rolls-Royce AE 2100J turboprops provide thrust. A fifth engine, an LHTEC CTS800 turboshaft, provides no thrust at all.<\/p><p>It drives a compressor whose only job is to blow high-pressure air over the upper surfaces of the wing and tail. This is boundary layer control: energising the airflow so it stays attached over a flap deflected to sixty degrees, a setting at which an unblown wing would simply have stalled.<\/p><p>The payoff is a controllable speed of roughly 50 knots. For scale, that is slower than many light aircraft approach, in an airframe with a maximum weight around 47 tonnes.<\/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\/BtlUSSpRILI\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n<p>The JMSDF&rsquo;s own channel filmed a water take-off from on board, above.<\/p><p>That is also why the take-off numbers look implausible. From water at 43 tonnes the US-2 is airborne in 280 metres, a figure Japanese press timed at about five seconds. From land it needs 490 metres at maximum weight.<\/p><h2 style=\"padding-top:22px\">Landing on a wave<\/h2><p>ShinMaywa advertises the ability to land in three-metre seas, and also describes the aircraft as able to land on waves a third of its own height. Both are marketing formulations of the same certified capability.<\/p><p>Operationally it is messier. The 2013 rescue was flown in a reported four-metre sea, after a first aircraft had already turned back. Crews do not use wave height alone; the go or no-go decision runs on a combined index of wave height and wavelength scored out of a hundred, because a long swell and a short chop of the same height are entirely different propositions.<\/p>\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img data-opt-id=718261348  fetchpriority=\"high\" decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/ml5psubhxdln.i.optimole.com\/cb:-oYn.d03c\/w:auto\/h:auto\/q:mauto\/ig:avif\/https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/09\/jmsdf-rescue-swimmer-us-2-hull-side.jpg\" alt=\"JMSDF rescue swimmer holding onto the hull of a US-2 at sea\" style=\"width:100%;height:auto;max-width:100%;display:block\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">A 71st Air Rescue Squadron rescue swimmer on the hull at sea. The aircraft carries three divers and two paramedics as part of an eleven-person crew. Photo: US Department of Defense<\/figcaption><\/figure>\r\n<p>A veteran squadron pilot described the technique to Jiji Press as slowing right to the limit and dropping the aircraft hard onto a wave that is just about to break, and said that after enough years the sea has zones that appear to glow where a landing is possible.<\/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\/QMEQrpq9FmY\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n<h2 style=\"padding-top:22px\">What changed from the US-1A<\/h2><p>The US-2 looks like its predecessor and is a substantially different aeroplane. The single most consequential change is not aerodynamic at all: the forward and centre fuselage were rebuilt as a pressurised section.<\/p><p>The earlier PS-1 and US-1A had no cabin pressurisation whatsoever, which meant cruising at around 10,000 feet and flying through weather rather than over it, on missions that could last many hours. The US-2 cruises at 20,000 feet. For a crew that must arrive fit to dive into a rough sea, that is a bigger gain than any speed figure.<\/p><p>It also brought triplex fly-by-wire, retaining one hydraulic channel as backup, and a glass cockpit with eight displays.<\/p>\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img data-opt-id=1581650007  decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/ml5psubhxdln.i.optimole.com\/cb:yHTS.d03b\/w:auto\/h:auto\/q:mauto\/ig:avif\/https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/09\/shinmaywa-us-2-takeoff-run-atsugi.jpg\" alt=\"ShinMaywa US-2 during its take-off run at Atsugi\" style=\"width:100%;height:auto;max-width:100%;display:block\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">A US-2 on its take-off run at Atsugi. Two aircraft are normally forward-based here, with the squadron holding an alert posture measured in tens of minutes. Photo: Wikimedia Commons<\/figcaption><\/figure>\r\n<h2 style=\"padding-top:22px\">A very small fleet<\/h2><p>Here the story turns awkward. Ten airframes have been funded, two prototypes and eight production aircraft. One was lost in 2015 off Cape Ashizuri during a three-engine water take-off, when an engine and a float were torn away and the aircraft sank in 300 metres of water. All nineteen aboard were rescued by a passing tanker. The investigation found excessive control inputs compounded by the absence of a defined three-engine take-off procedure.<\/p><p>The first prototype was retired in August 2024. As of March 2025, Japan&rsquo;s defence white paper recorded six on strength, with the ninth airframe in build.<\/p><p>Six aircraft, for a search-and-rescue region covering a substantial fraction of the western Pacific.<\/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\/fESLKL9Y8hU\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n<p>Japan&rsquo;s Joint Staff released the footage above of a real casualty evacuation flown in April 2025.<\/p><h2 style=\"padding-top:22px\">Why nobody else bought one<\/h2><p>The US-2 should be an obvious export. It has been offered repeatedly and has never sold.<\/p><p>India came closest. A requirement for around twelve amphibians was discussed from the early 2010s, negotiations opened in 2011, and ShinMaywa cut its offer from roughly $133 million to about $113 million per aircraft in 2016. A signature expected during a Tokyo visit that November was deferred, an industrial memorandum with Mahindra followed in 2018, and the whole thing was shelved by 2021 over price. In January 2026 India issued a request for information to wet-lease four amphibious aircraft for four years, which reopens the door without committing to buy anything.<\/p><p>Indonesia was offered three aircraft at about $100 million each in 2016 and chose the Canadian Viking CL-515 instead. Greece evaluated the type after the 2018 Attica fires and bought DHC-515s.<\/p><p>The obstacle is arithmetic. Japan itself skipped procurement in two consecutive years as the quoted price climbed, and Reuters reported in 2023 that a plan to buy two aircraft was scrapped after the price per aircraft nearly doubled to 30 billion yen. ShinMaywa declines to publish a price at all, telling Naval News that it varies widely with requirements.<\/p>\r\n<div style=\"background:#f8f9fa;border-left:4px solid #1565c0;padding:20px 22px;margin:18px 0 24px;font-size:16px;line-height:1.7;display:flex;gap:20px;align-items:flex-start\"><div><em>&ldquo;The most important feature of the US-2 is its ability to take off and land over very short distances on the water. Compared to other sea planes, it is by far the shortest.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>ShinMaywa Industries<\/strong> &mdash; Aircraft Division, Sales and Marketing Department, in a written reply to Naval News, August 2022<\/div><\/div><\/div>\r\n<p>A niche capability built in tiny numbers is expensive per unit, which shrinks the customer base, which keeps the numbers tiny. Amphibians competing for the firefighting market face a rival built in larger numbers for a broader mission, and the US-2 is not optimised for dropping water.<\/p><h2 style=\"padding-top:22px\">The people who fly it<\/h2><p>The 71st Air Rescue Squadron holds an alert posture measured in tens of minutes: airborne within an hour, or about thirty if the main engines are ready to start. It flies somewhere in the region of thirty to forty search-and-rescue and disaster-relief sorties a year, and marked its fiftieth anniversary in July 2026.<\/p>\r\n<div style=\"background:#f8f9fa;border-left:4px solid #5C91FF;padding:20px 22px;margin:18px 0 24px;font-size:16px;line-height:1.7;display:flex;gap:20px;align-items:flex-start\"><div><em>&ldquo;I have to lead from the front, so that the crew aboard are never in doubt about their decisions or their actions.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Lieutenant Junior Grade Megumi Okada<\/strong> &mdash; 71st Air Squadron, after her first flight as the first female US-2 aircraft commander, Mainichi Shimbun, July 2019<\/div><\/div><\/div>\r\n<p>The aircraft has begun appearing further afield. American special operations personnel examined one at Andersen Air Force Base in 2022 during market research into amphibious capability, and in April 2026 a 71st Squadron aircraft landed in the West Philippine Sea for a casualty evacuation drill with a US Navy landing ship, the type&rsquo;s Philippine debut.<\/p><p>Whether that interest ever becomes a contract is a different question. What is not in doubt is the gap the aircraft fills. Somewhere beyond helicopter range there is a life raft, and the US-2 is the only aeroplane in service that can go and get it.<\/p><p><em>Sources: ShinMaywa Industries technical and capability pages; JMSDF and Japanese Ministry of Defense equipment pages and press releases; Japan Defense White Paper FY2025; Naval News (Peter Ong, 2022); The Aviationist; Jiji Press; Mainichi Shimbun; Reuters; Sasakawa Peace Foundation.<\/em><\/p>\r\n<div style=\"background:#f0f4ff;border-left:4px solid #5C91FF;padding:16px 20px;margin:32px 0 8px\"><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\/ground-effect-explained-induced-drag-landing-float\/\">Ground Effect: The Cushion of Air That Isn&rsquo;t Really There<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/fr\/monstre-de-la-mer-caspienne-ekranoplan\/\">Le monstre de la mer Caspienne qui a effray\u00e9 la CIA<\/a><\/p><\/div>","protected":false},"excerpt":{"rendered":"<p>Japan kept alive a capability everyone else abandoned: an aircraft that flies out at 300 knots and then lands on the open ocean. The fifth engine, the 50-knot approach, and why nobody has bought one.<\/p>","protected":false},"author":27,"featured_media":18854651,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[665,664],"tags":[],"class_list":["post-18855274","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aviation-world","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>ShinMaywa US-2: The Flying Boat That Lands at Sea | MiGFlug<\/title>\n<meta name=\"description\" content=\"The ShinMaywa US-2 flies out at 300 knots and lands on the open ocean. 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