{"id":5103,"date":"2019-05-23T07:00:05","date_gmt":"2019-05-23T05:00:05","guid":{"rendered":"http:\/\/ribsonly.com\/2\/?p=5103"},"modified":"2025-06-02T14:33:35","modified_gmt":"2025-06-02T12:33:35","slug":"what-the-hull","status":"publish","type":"page","link":"https:\/\/ribsonly.com\/2\/what-the-hull\/","title":{"rendered":"What the Hull &#8211; 1 &#8211; Fascinating Alex Stavroulakis"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"853\" height=\"553\" src=\"https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2023\/01\/Alex_Dusseldorf_IMG_3326.webp\" alt=\"Alex D\u00fcsseldorf 2019 Alex (right) -  D\u00fcsseldorf 2019 - Skipper hull architect and designer @ RIBs ONLY - Home of the Rigid Inflatable Boat\" class=\"wp-image-18841\" srcset=\"https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2023\/01\/Alex_Dusseldorf_IMG_3326.webp 853w, https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2023\/01\/Alex_Dusseldorf_IMG_3326-150x97.webp 150w, https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2023\/01\/Alex_Dusseldorf_IMG_3326-768x498.webp 768w, https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2023\/01\/Alex_Dusseldorf_IMG_3326-600x389.webp 600w\" sizes=\"(max-width: 853px) 100vw, 853px\" \/><figcaption class=\"wp-element-caption\">Alex (right) D\u00fcsseldorf 2019 &#8211; Skipper hull architect &#8211; Photo \u00a9 Karel Overlaet &#8211; Medianaut<\/figcaption><\/figure>\n\n\n\n<div class=\"wp-block-rank-math-toc-block\" id=\"rank-math-toc\"><h2>Table of Contents<\/h2><nav><ul><li><a href=\"#introduction\">Introduction<\/a><\/li><li><a href=\"#1-what-makes-a-great-planing-hull\">1. What Makes a Great Planing Hull<\/a><\/li><li><a href=\"#2-what-is-the-function-of-the-horizontal-ribs-in-the-hull\">2. What is the Function of the Horizontal Ribs in the Hull<\/a><\/li><li><a href=\"#3-what-is-the-importance-of-the-dead-rise\">3. What is the Importance of the Dead Rise<\/a><\/li><li><a href=\"#4-how-do-you-test-the-hull\">4. How Do You Test the Hull<\/a><\/li><li><a href=\"#5-steps-or-no-steps-what-is-the-main-difference\">5. Steps or No Steps: What is the Main Difference<\/a><\/li><li><a href=\"#6-foils-on-a-rib-what-is-your-opinion\">6. Foils on a Rib: What is Your Opinion<\/a><\/li><li><a href=\"#7-which-hull-is-your-biggest-succes\">7. Which Hull is Your Biggest Succes<\/a><\/li><li><a href=\"#8-anything-you-want-to-share-with-the-ri-bs-only-members\">8. Anything You Want to Share With the RIBs ONLY Members<\/a><\/li><\/ul><\/nav><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"introduction\">Introduction<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Writing the article &#8216;<a href=\"https:\/\/ribsonly.com\/2\/how-to-buy-a-rigid-inflatable-boat-rib\/\">How to buy a RIB<\/a>&#8216;, I mentioned that the hull is the most important part of the RIB. It defines the RIB so to speak.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">So what makes a good hull? I found it of interest to you to hear the experts on this matter. So I contacted a top <a href=\"https:\/\/ribsonly.com\/2\/dynastream-new-hulls-technology-technohull-rib\/\">RIB hull<\/a> designer to tell us more on this subject: Alexandros Stavroulakis.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Alex is a Greek Naval Architect, R&amp;D Director and co-owner of Skipper-BSK, a Greek RIB shipyard that stands for speed and luxury.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">BSK Marine is a company that has years experience in vessel constructing and her rapid progress creates a remarkable history and makes Skipper boats synonymous to quality and seaworthiness.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Designing a Skipper Boat is a new challenge every time. Having studied naval architecture and industrial design and also being working in the boat industry from an early age, he knows each detail and every step of the boat construction from the inside to the outside and has the ability to make a supreme design from inside out.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Find out more &#8230;<\/p>\n\n\n\n<!--more-->\n\n\n\n<h2 class=\"wp-block-heading\" id=\"1-what-makes-a-great-planing-hull\">1. What Makes a Great Planing Hull<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">As I am travelling in Aegean Sea and most of the times I meet short and big waves, I need to have hulls that have the ability to plane in very low speed without pushing the bow up very high.<br>This spec combined with steps to have a high performance is a great hull.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"2-what-is-the-function-of-the-horizontal-ribs-in-the-hull\">2. What is the Function of the Horizontal Ribs in the Hull<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"2560\" height=\"1920\" src=\"https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2019\/05\/RIBsONLY_AS_Skipper02-scaled.jpg\" alt=\"\" class=\"wp-image-6092\" srcset=\"https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2019\/05\/RIBsONLY_AS_Skipper02-scaled.jpg 2560w, https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2019\/05\/RIBsONLY_AS_Skipper02-150x113.jpg 150w, https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2019\/05\/RIBsONLY_AS_Skipper02-600x450.jpg 600w, https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2019\/05\/RIBsONLY_AS_Skipper02-768x576.jpg 768w, https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2019\/05\/RIBsONLY_AS_Skipper02-50x38.jpg 50w\" sizes=\"(max-width: 2560px) 100vw, 2560px\" \/><figcaption class=\"wp-element-caption\">The Skipper&#8217;ss hull &#8211; Photo courtesy of Alexandros Stavroulakis<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">These are called \u201cspray rails\u201d. They are especially designed to interrupt the flow of the water to the upper level of the hull.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The water line when a boat running is a triangle with the one corner at the bow. The deeper the hull the bigger the water line. This also means a bigger surface touching the water. So resulting in higher drag and more consumption.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The spay rails, interact with that flow making the hull riding in higher level. This delivers a smaller water line and lower drag. Therefore these horizontal \u201cribs\u201d are very important and contribute massively to a better return.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"3-what-is-the-importance-of-the-dead-rise\">3. What is the Importance of the Dead Rise<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1920\" height=\"2560\" src=\"https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2019\/05\/RIBsONLY_AS_Skipper04-scaled.jpg\" alt=\"What the Hull! \u2013 Alexandros Stavroulakis @ RIBs ONLY - Home of the Rigid Inflatable Boat\" class=\"wp-image-6088\" srcset=\"https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2019\/05\/RIBsONLY_AS_Skipper04-scaled.jpg 1920w, https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2019\/05\/RIBsONLY_AS_Skipper04-113x150.jpg 113w, https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2019\/05\/RIBsONLY_AS_Skipper04-600x800.jpg 600w, https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2019\/05\/RIBsONLY_AS_Skipper04-768x1024.jpg 768w, https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2019\/05\/RIBsONLY_AS_Skipper04-38x50.jpg 38w\" sizes=\"(max-width: 1920px) 100vw, 1920px\" \/><figcaption class=\"wp-element-caption\">Photo courtesy of Alexandros Stavroulakis<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The dead rise is the angle from the hull to the \u201cfloor\u201d on the end of the hull (stern). The bigger the deadrise the smoother the landing after a jump. And also the stability could be not so good, the fuel efficiency and the top speed. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The combination of a deep V and steps in a golden ratio gives the hull the best characteristics and efficiency. Furthermore, slow or big boats are not jumping and therefore the angle of the bow is more important than the dead rise.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"4-how-do-you-test-the-hull\">4. How Do You Test the Hull<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2019\/05\/RIBsONLY_AS_Skipper01.jpg\" alt=\"What the Hull! \u2013 Alexandros Stavroulakis @ RIBs ONLY - Home of the Rigid Inflatable Boat\" class=\"wp-image-6091\" srcset=\"https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2019\/05\/RIBsONLY_AS_Skipper01.jpg 1024w, https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2019\/05\/RIBsONLY_AS_Skipper01-150x113.jpg 150w, https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2019\/05\/RIBsONLY_AS_Skipper01-600x450.jpg 600w, https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2019\/05\/RIBsONLY_AS_Skipper01-768x576.jpg 768w, https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2019\/05\/RIBsONLY_AS_Skipper01-50x38.jpg 50w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Photo courtesy of Alexandros Stavroulakis<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">After a lot of calculations and flow simulations, the final test of a hull is a real size hull with real weigh\/loads and engines on our Aegean Sea.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It is extremely important not only to test the hull in a \u201claboratory\u201d environment but even more so in real life. There is no match for testing on the sea as it changes every second as are the meteorological conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">We do more than one test out on the sea so as to study the behaviour of the hull in as many different conditions as possible.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If this hull passes our severe tests only then we proceed on the deck design and construction to <a href=\"https:\/\/ribsonly.com\/2\/rib-alunaut-a8-launch\/\">launch the RIB<\/a> in the market.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"5-steps-or-no-steps-what-is-the-main-difference\">5. Steps or No Steps: What is the Main Difference<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"2560\" height=\"1709\" src=\"https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2019\/05\/RIBsONLY_AS_Skipper03-scaled.jpg\" alt=\"What the Hull! \u2013 Alexandros Stavroulakis @ RIBs ONLY - Home of the Rigid Inflatable Boat\" class=\"wp-image-6090\" srcset=\"https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2019\/05\/RIBsONLY_AS_Skipper03-scaled.jpg 2560w, https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2019\/05\/RIBsONLY_AS_Skipper03-150x100.jpg 150w, https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2019\/05\/RIBsONLY_AS_Skipper03-600x400.jpg 600w, https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2019\/05\/RIBsONLY_AS_Skipper03-768x513.jpg 768w, https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2019\/05\/RIBsONLY_AS_Skipper03-50x33.jpg 50w\" sizes=\"(max-width: 2560px) 100vw, 2560px\" \/><figcaption class=\"wp-element-caption\">Photo courtesy of Alexandros Stavroulakis<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">For boats longer than 7 meters the steps are the only way for comfort and performance. The main defense is the lower drag that the water making on the hull, so more performance and more comfort as the boat is moving on an air bubble skin so to speak.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The steps suck air right under the exactly defined place of the hull. More steps amplifies the effect and the RIB comes into plane in seconds.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The calculation of where the steps will have the most efficiency on the hull is a secret.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"6-foils-on-a-rib-what-is-your-opinion\">6. Foils on a Rib: What is Your Opinion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">I\npersonally don\u2019t like it. There are two big difficulties with foils on a RIB. <\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>The distance from the hull to the water is bigger (higher) so it needs extended (longer) engines to have the  propellers in the water.<\/li>\n\n\n\n<li>Foils are not for rougher seas as it needs a minimum speed and if the waves are higher than the foils height, there is a problem.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"7-which-hull-is-your-biggest-succes\">7. Which Hull is Your Biggest Succes<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2019\/05\/RIBsONLY_AS_Skipper05.jpg\" alt=\"What the Hull! \u2013 Alexandros Stavroulakis @ RIBs ONLY - Home of the Rigid Inflatable Boat\" class=\"wp-image-6089\" srcset=\"https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2019\/05\/RIBsONLY_AS_Skipper05.jpg 1024w, https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2019\/05\/RIBsONLY_AS_Skipper05-150x113.jpg 150w, https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2019\/05\/RIBsONLY_AS_Skipper05-600x450.jpg 600w, https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2019\/05\/RIBsONLY_AS_Skipper05-768x576.jpg 768w, https:\/\/ribsonly.com\/2\/wp-content\/uploads\/2019\/05\/RIBsONLY_AS_Skipper05-50x38.jpg 50w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Photo courtesy of Alexandros Stavroulakis<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">All my hulls are based on the same idea and technology.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Our biggest success is the hull of the Skipper-BSK NC100s with the 4 steps designed back in 2004. For the first time a design like that was a world premiere.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This <a href=\"https:\/\/ribsonly.com\/2\/welcome-to-ribs-only-rigid-inflatable-boat\/\">RIB is designed with proportions that give the boat<\/a> a strong, expressive character and skilfully reflect her fast, seaworthy hull.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The boat\u2019s appearance and construction with emphasis on every detail, perfectly matches the high-grade materials. Skipper NC 100s is the first Skipper boat with reverse collar arch and the highest point in the middle of the vessel.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nowadays this arch is a trademark for Skipper-BSK boats, as all models have the same style. The Desire 120 models have the same hull but scaled up.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"8-anything-you-want-to-share-with-the-ri-bs-only-members\">8. Anything You Want to Share With the <a href=\"https:\/\/www.facebook.com\/groups\/686861794831522\" target=\"_blank\" rel=\"noreferrer noopener\">RIBs ONLY Members<\/a><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Yes. When you want to buy a boat, you must define what will be the use of the boat and which are the personal key features.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Furthermore, I would like that you to consider this. There\u2019s no point in comparing non-similar boats and brands. As in the car industry, no one is comparing a Porsche to a Fiat or an SUV to a sports car.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It is necessary to understand that also in the boat industry there are categories and qualities. And remember that everything affects the price.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction Writing the article &#8216;How to buy a RIB&#8216;, I mentioned that the hull is the most important part of the RIB. It defines the RIB so to speak. So what makes a good hull? I found it of interest to you to hear the experts on this matter. So I contacted a top RIB hull designer to tell us&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"open","ping_status":"open","template":"","meta":{"footnotes":""},"categories":[121,65],"tags":[],"class_list":["post-5103","page","type-page","status-publish","hentry","category-article","category-skipper-bsk"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/ribsonly.com\/2\/wp-json\/wp\/v2\/pages\/5103","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ribsonly.com\/2\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/ribsonly.com\/2\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/ribsonly.com\/2\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ribsonly.com\/2\/wp-json\/wp\/v2\/comments?post=5103"}],"version-history":[{"count":0,"href":"https:\/\/ribsonly.com\/2\/wp-json\/wp\/v2\/pages\/5103\/revisions"}],"wp:attachment":[{"href":"https:\/\/ribsonly.com\/2\/wp-json\/wp\/v2\/media?parent=5103"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ribsonly.com\/2\/wp-json\/wp\/v2\/categories?post=5103"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ribsonly.com\/2\/wp-json\/wp\/v2\/tags?post=5103"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}