{"id":72761,"date":"2026-06-29T07:02:55","date_gmt":"2026-06-29T05:02:55","guid":{"rendered":"https:\/\/sailorz.com\/?p=72761"},"modified":"2026-06-26T17:38:09","modified_gmt":"2026-06-26T15:38:09","slug":"the-new-imoca-boats-from-thomas-ruyant-and-kojiro-shiraishi-analysed-by-their-architects","status":"publish","type":"post","link":"https:\/\/sailorz.com\/en\/imoca-en\/the-new-imoca-boats-from-thomas-ruyant-and-kojiro-shiraishi-analysed-by-their-architects\/","title":{"rendered":"The new Imoca boats from Thomas Ruyant and Kojiro Shiraishi analysed by their architects"},"content":{"rendered":"

In recent weeks,\u00a0two latest-generation Imoca boats have been unveiled<\/strong>:\u00a0<\/em>DMG Mori Global One<\/a>\u00a0and\u00a0<\/em>TR Racing<\/a>, designed respectively under the direction of\u00a0Guillaume Verdier<\/strong>\u00a0and\u00a0Antoine Koch<\/strong>. Two yachts with distinct philosophies, shaped to meet the expectations and programmes of their skippers,\u00a0Thomas Ruyant<\/strong>\u00a0and\u00a0Kojiro Shiraishi<\/strong>.\u00a0<\/em>Sailorz\u00a0takes a closer look with their architects.\u00a0<\/em><\/p>\n

The Imoca boats designed for the 2028 Vend\u00e9e Globe are starting to be revealed. On 4 June,\u00a0DMG Mori Global One<\/em><\/strong>, the new boat for Kojiro Shiraishi,\u00a0was presented to the press<\/a>. Two weeks later, on 18 June, again in Lorient, it was Thomas Ruyant\u2019s turn: his Imoca, currently named\u00a0TR Racing<\/em>\u00a0after the skipper\u2019s company, still in search of partners, came out of the yard and was\u00a0immediately launched<\/a>.<\/p>\n

Although these machines have been designed to meet the\u00a0same programme<\/strong>\u2014namely completing a crewed round-the-world race (The Ocean Race, start January 2027) followed by a solo race (Vend\u00e9e Globe 2028)\u2014the\u00a0architectural approaches differ quite significantly<\/strong>.<\/p>\n

“For the design of\u00a0<\/em>TR Racing, the initial brief was to\u00a0improve versatility<\/strong>\u00a0compared with the previous boat\u00a0<\/em>[the ex-Vuln\u00e9rable<\/em>, now\u00a0Allagrande Mapei<\/em>, ed. note]. The goal was to strengthen its strengths, particularly downwind, while correcting its weaknesses, especially upwind and on reaching in medium conditions, as well as in transitions and re-acceleration phases,”<\/em>\u00a0explains\u00a0Antoine Koch<\/strong>, head of the AKO design office. A goal shared by Boris Herrmann\u2019s team\u2014for their new\u00a0Malizia<\/em>, scheduled for launch on 6 July\u2014and Lo\u00efs Berrehar\u2019s project, whose\u00a0Banque Populaire<\/em>\u00a0boat is expected in spring 2027\u2014both will feature Imoca boats derived from the same mould\u00a0(see our article<\/a>)<\/em>.<\/p>\n

Double chine for\u00a0TR Racing<\/em>,
\nbustle\u00a0for\u00a0DMG Mori<\/em><\/span><\/h2>\n

Thomas Ruyant\u2019s new Imoca is therefore\u00a0a continuation of the previous generation<\/strong>, of which it is an evolution. It features aggressive lines with strong concavity. The hull includes\u00a0a double-step chine configuration<\/strong>, allowing for a relatively narrow hull downwind while providing greater power reserves upwind and on reaching.\u00a0“In manageable seas, the first chine will be enough to prevent the bow from burying itself; in the long Southern Ocean swell,\u00a0both chines will come into play to help lift the bow<\/strong><\/em>, explains Antoine Koch.\u00a0The boat will be less prone to nosediving because it will be able to generate more dynamic vertical lift. This will help reduce deceleration when it meets a wave. There will also be\u00a0less water on deck<\/strong>, although that remains relative in Imoca\u00a0racing, where boats are still very wet.<\/em>\u201d<\/p>\n

What about\u00a0DMG Mori<\/em>?\u00a0“The initial premise was simple: we were designing incredible boats, but they were becoming very difficult and punishing for sailors<\/em>, says\u00a0Guillaume Verdier<\/strong>.\u00a0We received many reports from skippers telling us they were exhausting themselves on hulls that were slamming heavily. We could have continued down that path, but it would have led to ever more extreme boats.\u00a0Kojiro, on the contrary, wanted a less violent machine<\/strong>.”<\/em><\/p>\n

Working alongside Guillaume Verdier,\u00a0Romaric Neyhousser<\/strong>\u00a0adds: “Kojiro asked us to explore a different path. Many skippers prefer continuity, with gradual developments. That was not the case here\u2014Kojiro gave us a free hand and accepted that we would take risks<\/strong>. He was one of the main drivers behind this willingness to break away from previous concepts.”\u00a0<\/em>The first striking feature on the hull of\u00a0DMG Mori<\/em>\u00a0is\u00a0the famous bustle, a kind of central trimaran-like hull section<\/strong>, first developed in 2020 on America\u2019s Cup AC75s, but a major first in Imoca racing.<\/p>\n

The objective is to sail with\u00a0reduced wetted surface area and limited heel<\/strong>:\u00a0“For most of the time, the boat will sail like the central hull of a trimaran and, from time to time, revert to behaving like an Imoca hull<\/em>, confirms Guillaume Verdier.\u00a0This will reduce slamming, dampen the boat\u2019s movements and\u00a0deliver a much smoother ride through the waves<\/strong>. We hope overall performance will improve because sailors will be able to make better use of the boat\u2019s full potential.”\u00a0<\/em>According to Romaric Neyhousser,\u00a0“once the boat accelerates, only the central hull will remain immersed<\/em>,\u00a0leaving us with an extremely slender wetted surface,\u00a0rather like a large canoe slicing through the water like a blade<\/strong>, at least according to our simulations.<\/em>\u201d<\/p>\n

Foils and rudders: the devil
\nis in the detail\u00a0<\/span><\/h2>\n

As for\u00a0the foils<\/strong>, the developments on both Imocas are less striking than those made to the hulls, but they are no less significant for anyone looking closely at the finer details.\u00a0“The foils on\u00a0<\/em>TR Racing\u00a0deliver\u00a025 to 30% more lift<\/strong>\u00a0during acceleration than our previous appendages<\/em>, promises Antoine Koch.\u00a0This comes down to a multitude of small refinements: the foil profile itself, its positioning within the hull, the proportions between the shaft and the tip\u2026”\u00a0<\/em>On\u00a0DMG Mori Global One<\/em>, the foils have been designed in close harmony with the hull.\u00a0“To perform properly, this hull needs to sail flatter than other Imocas.\u00a0The foils help limit heel, which should remain between 0 and 10 degrees<\/strong>“<\/em>, explains Guillaume Verdier.<\/p>\n

As for the rudders,\u00a0TR Racing<\/em>\u00a0features a V-shaped configuration<\/strong>, inspired by the concept first introduced on\u00a0Charal 2<\/em>, but with the appendages spaced further apart than on J\u00e9r\u00e9mie Beyou\u2019s Imoca. Extensive work has been carried out on their operation to keep the boat flying downwind with less drag and more predictable handling. Larger than before, they generate\u00a0a stabilising force at the stern that improves the boat\u2019s longitudinal stability<\/strong>.<\/p>\n

On\u00a0DMG Mori<\/em>, the rudders have also been lengthened<\/strong>.\u00a0“We\u2019ve added almost a metre compared with the previous boat<\/em>, reveals\u00a0L\u00e9o Gonin<\/strong>, Head of Build for Kojiro Shiraishi\u2019s team.\u00a0The rudders are set well apart and angled, and we have also worked on the lift characteristics, whose effectiveness\u00a0<\/em>Charal 2\u00a0has already demonstrated.”<\/em><\/p>\n

Boats designed for more time at the helm<\/span><\/h2>\n

From an ergonomic perspective<\/strong>, both Imocas have been designed to perform\u00a0equally well fully crewed or single-handed<\/strong>, without favouring either configuration. On both\u00a0TR Racing<\/em>\u00a0and\u00a0DMG Mori<\/em>, the cockpits and interior layouts have therefore been designed to be easily reconfigured depending on how the boat is being sailed.\u00a0When it comes to helming, one race marked a turning point for the Imoca class: the 2023 Transat Jacques Vabre<\/strong>, where Thomas Ruyant and Morgan Lagravi\u00e8re claimed victory after spending significantly more time steering than their rivals.<\/p>\n

“For years, everyone kept saying that autopilots had become so efficient that there was no point in hand-steering<\/em>, recalls Antoine Koch.\u00a0Thomas and Morgan proved otherwise, and others quickly followed their lead: during the 2025 Transat Caf\u00e9 L\u2019Or,\u00a0the top seven crews all spent a great deal of time steering in the trade winds<\/strong>.”\u00a0<\/em>On\u00a0TR Racing<\/em>, the helming stations were considered from the very earliest stages of the design process. The boat has therefore been fitted with\u00a0twin steering wheels<\/strong>, a small revolution in the Imoca class, as the last boat to feature them was Kito de Pavant\u2019s former\u00a0Groupe Bel<\/em>, launched in 2007.\u00a0“Beyond a certain load on the rudders, a tiller becomes difficult to manage.\u00a0A steering wheel allows you to cope with much higher loads<\/strong>\u00a0while maintaining very precise control,”<\/em>\u00a0says Antoine Koch.<\/p>\n

A different solution has been chosen for\u00a0DMG Mori<\/em>, which features a\u00a0hybrid system combining two tillers linked to the steering linkage<\/strong>, along with two steering wheels.\u00a0“The wheels do not directly control the mechanical steering system but instead interface with the autopilot<\/em>, explains L\u00e9o Gonin.\u00a0They are extremely responsive and allow exceptionally fine adjustments<\/strong>, down to a quarter of a degree. Now that we have a better understanding of foils, we are moving towards managing a more stable flight, and we need that level of steering precision.”<\/em><\/p>\n

Rarely has a new generation of Imocas displayed such contrasting design philosophies from its very first representatives, prompting Antoine Koch to observe:\u00a0“It\u2019s quite surprising because, in most classes, designs gradually converge.\u00a0Here, by contrast, we\u2019re seeing a very clear divergence<\/strong>.”<\/em><\/p>\n

Photo : Pierre Bouras\/TRR<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

In recent weeks, two latest-generation Imoca boats have been unveiled: DMG Mori Global One and TR Racing, designed respectively under the direction of Guillaume Verdier and Antoine Koch. Two yachts with distinct philosophies, shaped to meet the expectations and programmes of their skippers, Thomas Ruyant and Kojiro Shiraishi. Sailorz takes a closer look with their architects.\u00a0<\/p>\n","protected":false},"author":19,"featured_media":72753,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[257],"tags":[],"class_list":["post-72761","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-imoca-en"],"yoast_head":"\nThe new Imoca boats from Thomas Ruyant and Kojiro Shiraishi analysed by their architects - Sailorz<\/title>\n<meta name=\"description\" content=\"In recent weeks,\u00a0two latest-generation Imoca boats have been unveiled:\u00a0DMG Mori Global One\u00a0and\u00a0TR Racing.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/sailorz.com\/en\/imoca-en\/the-new-imoca-boats-from-thomas-ruyant-and-kojiro-shiraishi-analysed-by-their-architects\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The new Imoca boats from Thomas Ruyant and Kojiro Shiraishi analysed by their architects - Sailorz\" \/>\n<meta property=\"og:description\" content=\"In recent weeks,\u00a0two latest-generation Imoca boats have been unveiled:\u00a0DMG Mori Global One\u00a0and\u00a0TR Racing.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/sailorz.com\/en\/imoca-en\/the-new-imoca-boats-from-thomas-ruyant-and-kojiro-shiraishi-analysed-by-their-architects\/\" \/>\n<meta property=\"og:site_name\" content=\"Sailorz\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/tipandshaft\/\" \/>\n<meta property=\"article:published_time\" content=\"2026-06-29T05:02:55+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/sailorz.com\/wp-content\/uploads\/2026\/06\/tr.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1100\" \/>\n\t<meta property=\"og:image:height\" content=\"550\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Lola Denisan\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@TipShaft\" \/>\n<meta name=\"twitter:site\" content=\"@TipShaft\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Lola Denisan\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/sailorz.com\\\/en\\\/imoca-en\\\/the-new-imoca-boats-from-thomas-ruyant-and-kojiro-shiraishi-analysed-by-their-architects\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/sailorz.com\\\/en\\\/imoca-en\\\/the-new-imoca-boats-from-thomas-ruyant-and-kojiro-shiraishi-analysed-by-their-architects\\\/\"},\"author\":{\"name\":\"Lola Denisan\",\"@id\":\"https:\\\/\\\/sailorz.com\\\/en\\\/#\\\/schema\\\/person\\\/91ef9c2b34850c28e42a22123606d47b\"},\"headline\":\"The new Imoca boats from Thomas Ruyant and Kojiro Shiraishi analysed by their architects\",\"datePublished\":\"2026-06-29T05:02:55+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/sailorz.com\\\/en\\\/imoca-en\\\/the-new-imoca-boats-from-thomas-ruyant-and-kojiro-shiraishi-analysed-by-their-architects\\\/\"},\"wordCount\":1339,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/sailorz.com\\\/en\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/sailorz.com\\\/en\\\/imoca-en\\\/the-new-imoca-boats-from-thomas-ruyant-and-kojiro-shiraishi-analysed-by-their-architects\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/sailorz.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/tr.jpg\",\"articleSection\":[\"Imoca\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/sailorz.com\\\/en\\\/imoca-en\\\/the-new-imoca-boats-from-thomas-ruyant-and-kojiro-shiraishi-analysed-by-their-architects\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/sailorz.com\\\/en\\\/imoca-en\\\/the-new-imoca-boats-from-thomas-ruyant-and-kojiro-shiraishi-analysed-by-their-architects\\\/\",\"url\":\"https:\\\/\\\/sailorz.com\\\/en\\\/imoca-en\\\/the-new-imoca-boats-from-thomas-ruyant-and-kojiro-shiraishi-analysed-by-their-architects\\\/\",\"name\":\"The new Imoca boats from Thomas Ruyant and Kojiro Shiraishi analysed by their architects - 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