{"id":8697,"date":"2026-10-07T13:36:06","date_gmt":"2026-10-07T11:36:06","guid":{"rendered":"https:\/\/woodkit.pro\/?page_id=8697"},"modified":"2026-10-09T02:43:17","modified_gmt":"2026-10-09T00:43:17","slug":"surfboard-anatomy","status":"publish","type":"page","link":"https:\/\/woodkit.pro\/en\/surfboard-anatomy\/","title":{"rendered":"Surfboard anatomy"},"content":{"rendered":"\n<style>\nbody.page-template-default .page-header{display:none}\nbody:has(.wkg){background:#071522}\n.wkg{--ink:#071522;--mut:#4a5563;--bg:#F2F2F0;--lime:#C5F135;--line:rgba(7,21,34,.14);background:var(--bg);color:var(--ink);font-family:\"Roboto\",system-ui,sans-serif;font-size:18px;line-height:1.7;margin:0 calc(50% - 50vw);padding:0 0 96px}\n.wkg *{box-sizing:border-box}\n.wkg a{color:var(--ink);text-decoration:underline;text-decoration-color:#8fb21a;text-underline-offset:3px}\n.wkg a:hover{text-decoration-color:var(--ink)}\n.wkg-hero{background:var(--ink);color:#F2F2F0;padding:88px 24px 72px}\n.wkg-hero 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var(--line);margin-top:56px;padding-top:28px}\n.wkg-av{width:64px;height:64px;background:var(--ink);color:var(--lime);display:flex;align-items:center;justify-content:center;font-family:\"Barlow Condensed\",sans-serif;font-size:28px;font-weight:700}\n.wkg-author p{font-size:15px;margin:0 0 6px}\n.wkg-src{font-size:14px;line-height:1.6;color:var(--mut)}\n.wkg-src li{margin-bottom:6px}\n@media (max-width:700px){.wkg{font-size:17px}.wkg-hero{padding:64px 16px 52px}.wkg-body{padding:40px 16px 0}.wkg-cols{grid-template-columns:1fr}.wkg-cta{padding:28px 20px}}\n<\/style><article class=\"wkg\" itemscope itemtype=\"https:\/\/schema.org\/Article\"><header class=\"wkg-hero\"><div class=\"in\"><p class=\"wkg-k\"><a href=\"https:\/\/woodkit.pro\/en\/learn\/\" style=\"color:inherit;text-decoration:none\">Learn<\/a> \u00b7 Board science \u00b7 Anatomy<\/p><h1 itemprop=\"headline\">Surfboard anatomy: every part and what it does in the water<\/h1><p class=\"wkg-lead\">Outline, rocker, foil, rails, bottom, nose, tail and fins: what each part is, what it changes when you surf and how it is built in a hollow wooden board.<\/p><p class=\"wkg-meta\">By Guillermo Est\u00e9vez \u00b7 WOODKIT.PRO \u00b7 Updated October 2026<\/p><\/div><\/header><div class=\"wkg-body\"><div class=\"wkg-answer\"><p><strong>Short answer:<\/strong> a board is defined in three views. From above, the outline. From the side, rocker and foil. In section, the rails and the bottom. Nose, tail and fins finish the design. No part works alone: the board rides as a whole.<\/p><\/div><nav class=\"wkg-toc\"><b>In this guide<\/b><ol><li><a href=\"#outline\">Outline<\/a><\/li><li><a href=\"#rocker\">Rocker<\/a><\/li><li><a href=\"#foil\">Foil<\/a><\/li><li><a href=\"#cantos\">Rails<\/a><\/li><li><a href=\"#fondo\">Bottom<\/a><\/li><li><a href=\"#punta-cola\">Nose and tail<\/a><\/li><li><a href=\"#quillas\">Fins<\/a><\/li><li><a href=\"#faq\">FAQ<\/a><\/li><\/ol><\/nav><style>.wkv .wkv-legend{list-style:none;margin:18px 0 0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:12px 20px}.wkv .wkv-legend li{margin:0;display:grid;grid-template-columns:26px 1fr;gap:10px;align-items:start;font-size:14px;line-height:1.35;color:#4a5563}.wkv .wkv-n{width:26px;height:26px;border-radius:50%;background:#071522;color:#C5F135;font-family:\"Roboto Mono\",monospace;font-size:12px;font-weight:700;display:flex;align-items:center;justify-content:center}.wkv .wkv-legend strong{display:block;font-family:\"Barlow Condensed\",sans-serif;font-size:19px;font-weight:700;text-transform:uppercase;color:#071522;line-height:1.1}.wkv .wkv-l4{grid-template-columns:repeat(4,1fr)}@media (max-width:700px){.wkv .wkv-legend{grid-template-columns:repeat(2,1fr);gap:12px 14px}}<\/style><figure class=\"wkg-fig wkv\"><p class=\"wkv-k\">Plan view<\/p><svg viewBox=\"0 -8 760 276\" role=\"img\" aria-label=\"Plan view of a board with its numbered parts\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M60,130 C120,40 460,30 620,70 L700,92 L700,168 L620,190 C460,230 120,220 60,130 Z\" fill=\"#d8bd91\" stroke=\"#071522\" stroke-width=\"2.5\"\/><path d=\"M60,130 C120,40 460,30 620,70\" fill=\"none\" stroke=\"#8fb21a\" stroke-width=\"5\" stroke-opacity=\".9\"\/><line x1=\"60\" y1=\"130\" x2=\"700\" y2=\"130\" stroke=\"#071522\" stroke-width=\"1.2\" stroke-dasharray=\"6 5\"\/><line x1=\"330\" y1=\"40\" x2=\"330\" y2=\"220\" stroke=\"#8fb21a\" stroke-width=\"3\"\/><rect x=\"616\" y=\"82\" width=\"30\" height=\"40\" fill=\"#C5F135\" fill-opacity=\".25\" stroke=\"#8fb21a\" stroke-width=\"2\" stroke-dasharray=\"5 4\"\/><rect x=\"627\" y=\"90\" width=\"8\" height=\"26\" rx=\"4\" fill=\"#071522\" transform=\"rotate(-6 631 103.0)\"\/><rect x=\"616\" y=\"138\" width=\"30\" height=\"40\" fill=\"#C5F135\" fill-opacity=\".25\" stroke=\"#8fb21a\" stroke-width=\"2\" stroke-dasharray=\"5 4\"\/><rect x=\"627\" y=\"144\" width=\"8\" height=\"26\" rx=\"4\" fill=\"#071522\" transform=\"rotate(6 631 157.0)\"\/><rect x=\"660\" y=\"113\" width=\"28\" height=\"34\" fill=\"#C5F135\" fill-opacity=\".25\" stroke=\"#8fb21a\" stroke-width=\"2\" stroke-dasharray=\"5 4\"\/><rect x=\"670\" y=\"118\" width=\"8\" height=\"24\" rx=\"4\" fill=\"#071522\" transform=\"rotate(0 674 130.0)\"\/><line x1=\"60\" y1=\"130\" x2=\"34\" y2=\"130\" stroke=\"#071522\" stroke-width=\"1.2\"\/><circle cx=\"20\" cy=\"130\" r=\"17\" fill=\"#071522\"\/><text x=\"20\" y=\"136\" text-anchor=\"middle\" font-family=\"Roboto Mono,monospace\" font-weight=\"700\" font-size=\"17\" fill=\"#C5F135\">1<\/text><line x1=\"330\" y1=\"40\" x2=\"330\" y2=\"26\" stroke=\"#071522\" stroke-width=\"1.2\"\/><circle cx=\"330\" cy=\"12\" r=\"17\" fill=\"#071522\"\/><text x=\"330\" y=\"18\" text-anchor=\"middle\" font-family=\"Roboto Mono,monospace\" font-weight=\"700\" font-size=\"17\" fill=\"#C5F135\">2<\/text><line x1=\"500\" y1=\"44\" x2=\"520\" y2=\"22\" stroke=\"#071522\" stroke-width=\"1.2\"\/><circle cx=\"536\" cy=\"14\" r=\"17\" fill=\"#071522\"\/><text x=\"536\" y=\"20\" text-anchor=\"middle\" font-family=\"Roboto Mono,monospace\" font-weight=\"700\" font-size=\"17\" fill=\"#C5F135\">3<\/text><line x1=\"700\" y1=\"130\" x2=\"722\" y2=\"130\" stroke=\"#071522\" stroke-width=\"1.2\"\/><circle cx=\"740\" cy=\"130\" r=\"17\" fill=\"#071522\"\/><text x=\"740\" y=\"136\" text-anchor=\"middle\" font-family=\"Roboto Mono,monospace\" font-weight=\"700\" font-size=\"17\" fill=\"#C5F135\">4<\/text><line x1=\"200\" y1=\"130\" x2=\"200\" y2=\"236\" stroke=\"#071522\" stroke-width=\"1.2\"\/><circle cx=\"200\" cy=\"248\" r=\"17\" fill=\"#071522\"\/><text x=\"200\" y=\"254\" text-anchor=\"middle\" font-family=\"Roboto Mono,monospace\" font-weight=\"700\" font-size=\"17\" fill=\"#C5F135\">5<\/text><line x1=\"640\" y1=\"178\" x2=\"640\" y2=\"236\" stroke=\"#071522\" stroke-width=\"1.2\"\/><circle cx=\"640\" cy=\"248\" r=\"17\" fill=\"#071522\"\/><text x=\"640\" y=\"254\" text-anchor=\"middle\" font-family=\"Roboto Mono,monospace\" font-weight=\"700\" font-size=\"17\" fill=\"#C5F135\">6<\/text><\/svg><ol class=\"wkv-legend\"><li><b class=\"wkv-n\">1<\/b><span><strong>Nose<\/strong>the front end<\/span><\/li><li><b class=\"wkv-n\">2<\/b><span><strong>Wide point<\/strong>where the volume sits<\/span><\/li><li><b class=\"wkv-n\">3<\/b><span><strong>Rail<\/strong>the edge, deck to bottom<\/span><\/li><li><b class=\"wkv-n\">4<\/b><span><strong>Tail<\/strong>the back end, releases water<\/span><\/li><li><b class=\"wkv-n\">5<\/b><span><strong>Stringer<\/strong>the skeleton&#8217;s centre spine<\/span><\/li><li><b class=\"wkv-n\">6<\/b><span><strong>Fins<\/strong>on reinforcement blocks<\/span><\/li><\/ol><figcaption>Plan view: the wide point shows where the volume sits; the fins sit on reinforcement blocks.<\/figcaption><\/figure><h2 id=\"outline\">Outline: the shape from above<\/h2><div class=\"wkg-cols\"><div class=\"wkg-card\"><h3>What it is<\/h3><p>The board&#8217;s shape seen from above: length, width, where the wide point sits and how full or narrow the nose and tail are.<\/p><\/div><div class=\"wkg-card\"><h3>In the water<\/h3><p>A parallel, full outline gives stability, paddle power and straight-line speed. A curvier one, narrower at the ends, turns in less space. A wide point forward helps paddling; further back, it helps pivoting.<\/p><\/div><\/div><p><strong>In a WOODKIT hollow board:<\/strong> the outline becomes the deck and bottom skins and the path of the rails.<\/p><figure class=\"wkg-fig wkv\"><p class=\"wkv-k\">From the side \u00b7 vertical scale exaggerated<\/p><svg viewBox=\"-6 20 776 232\" role=\"img\" aria-label=\"Side view: bottom curve (rocker) and the height of each rib (foil)\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><line x1=\"30\" y1=\"194\" x2=\"740\" y2=\"194\" stroke=\"#4a5563\" stroke-width=\"1.5\" stroke-dasharray=\"5 5\"\/><path d=\"M50,118 C160,92 560,92 720,150 L720,156 C600,192 150,186 50,118 Z\" fill=\"#efe3cc\"\/><rect x=\"107\" y=\"108.9\" width=\"6\" height=\"33.9\" fill=\"#b8965f\"\/><rect x=\"157\" y=\"104.9\" width=\"6\" height=\"49.3\" fill=\"#b8965f\"\/><rect x=\"207\" y=\"102.6\" width=\"6\" height=\"59.6\" fill=\"#b8965f\"\/><rect x=\"257\" y=\"101.5\" width=\"6\" height=\"66.6\" fill=\"#071522\"\/><rect x=\"307\" y=\"101.4\" width=\"6\" height=\"70.9\" fill=\"#b8965f\"\/><rect x=\"357\" y=\"102.3\" width=\"6\" height=\"72.9\" fill=\"#b8965f\"\/><rect x=\"407\" y=\"104.2\" width=\"6\" height=\"72.9\" fill=\"#b8965f\"\/><rect x=\"457\" y=\"107.1\" width=\"6\" height=\"70.7\" fill=\"#b8965f\"\/><rect x=\"507\" y=\"111.1\" width=\"6\" height=\"66.3\" fill=\"#b8965f\"\/><rect x=\"557\" y=\"116.5\" width=\"6\" height=\"59.3\" fill=\"#b8965f\"\/><rect x=\"607\" y=\"123.6\" width=\"6\" height=\"49.1\" fill=\"#b8965f\"\/><rect x=\"657\" y=\"133.1\" width=\"6\" height=\"34.5\" fill=\"#b8965f\"\/><path d=\"M50,118 C160,92 560,92 720,150\" fill=\"none\" stroke=\"#071522\" stroke-width=\"2.5\"\/><path d=\"M50,118 C150,186 600,192 720,156\" fill=\"none\" stroke=\"#8fb21a\" stroke-width=\"5\"\/><defs><marker id=\"wkv-sa\" viewBox=\"0 0 10 10\" refX=\"8\" refY=\"5\" markerWidth=\"7\" markerHeight=\"7\" orient=\"auto-start-reverse\"><path d=\"M0,0 L10,5 L0,10 Z\" fill=\"#4a5563\"\/><\/marker><\/defs><line x1=\"50\" y1=\"192\" x2=\"50\" y2=\"124\" stroke=\"#4a5563\" stroke-width=\"2\" marker-start=\"url(#wkv-sa)\" marker-end=\"url(#wkv-sa)\"\/><line x1=\"720\" y1=\"192\" x2=\"720\" y2=\"162\" stroke=\"#4a5563\" stroke-width=\"2\" marker-start=\"url(#wkv-sa)\" marker-end=\"url(#wkv-sa)\"\/><line x1=\"420\" y1=\"177.27312594051068\" x2=\"420\" y2=\"222\" stroke=\"#071522\" stroke-width=\"1.2\"\/><circle cx=\"420\" cy=\"232\" r=\"17\" fill=\"#071522\"\/><text x=\"420\" y=\"238\" text-anchor=\"middle\" font-family=\"Roboto Mono,monospace\" font-weight=\"700\" font-size=\"17\" fill=\"#C5F135\">1<\/text><line x1=\"50\" y1=\"158\" x2=\"30\" y2=\"158\" stroke=\"#071522\" stroke-width=\"1.2\"\/><circle cx=\"14\" cy=\"158\" r=\"17\" fill=\"#071522\"\/><text x=\"14\" y=\"164\" text-anchor=\"middle\" font-family=\"Roboto Mono,monospace\" font-weight=\"700\" font-size=\"17\" fill=\"#C5F135\">2<\/text><line x1=\"728\" y1=\"176\" x2=\"738\" y2=\"176\" stroke=\"#071522\" stroke-width=\"1.2\"\/><circle cx=\"752\" cy=\"176\" r=\"17\" fill=\"#071522\"\/><text x=\"752\" y=\"182\" text-anchor=\"middle\" font-family=\"Roboto Mono,monospace\" font-weight=\"700\" font-size=\"17\" fill=\"#C5F135\">3<\/text><line x1=\"260\" y1=\"101.48409276946809\" x2=\"260\" y2=\"52\" stroke=\"#071522\" stroke-width=\"1.2\"\/><circle cx=\"260\" cy=\"40\" r=\"17\" fill=\"#071522\"\/><text x=\"260\" y=\"46\" text-anchor=\"middle\" font-family=\"Roboto Mono,monospace\" font-weight=\"700\" font-size=\"17\" fill=\"#C5F135\">4<\/text><\/svg><ol class=\"wkv-legend wkv-l4\"><li><b class=\"wkv-n\">1<\/b><span><strong>Rocker<\/strong>the bottom curve<\/span><\/li><li><b class=\"wkv-n\">2<\/b><span><strong>Nose<\/strong>how much it lifts off flat<\/span><\/li><li><b class=\"wkv-n\">3<\/b><span><strong>Tail<\/strong>how much it lifts off flat<\/span><\/li><li><b class=\"wkv-n\">4<\/b><span><strong>Foil<\/strong>the height of each rib<\/span><\/li><\/ol><figcaption>From the side: the bottom curve is the rocker; the height of each rib, the foil.<\/figcaption><\/figure><h2 id=\"rocker\">Rocker: the bottom curve<\/h2><div class=\"wkg-cols\"><div class=\"wkg-card\"><h3>What it is<\/h3><p>The board&#8217;s curve seen from the side, measured from a flat surface: how much the nose and tail lift.<\/p><\/div><div class=\"wkg-card\"><h3>In the water<\/h3><p>Low rocker: more speed and glide, better paddling, less room in steep waves. More rocker: the board fits vertical waves and turns tighter, at the cost of some speed.<\/p><\/div><\/div><p><strong>In a WOODKIT hollow board:<\/strong> rocker isn&#8217;t sanded in: the rocker table and the lower profile of the stringer and ribs set it. What the machine cuts is what you surf.<\/p><h2 id=\"foil\">Foil: thickness along the board<\/h2><div class=\"wkg-cols\"><div class=\"wkg-card\"><h3>What it is<\/h3><p>How thickness is spread from nose to tail. Two boards with the same maximum thickness can have very different foils.<\/p><\/div><div class=\"wkg-card\"><h3>In the water<\/h3><p>More thickness in the middle and thin ends: a sensitive board that&#8217;s easy to sink into turns. Volume spread towards the ends: more paddle power and stability.<\/p><\/div><\/div><p><strong>In a WOODKIT hollow board:<\/strong> foil comes from the height of each rib. That&#8217;s why the board&#8217;s volume is set when the frame is cut.<\/p><style>.wkv{margin:36px 0}.wkv svg{display:block;width:100%;height:auto}.wkv .wkv-k{font-family:\"Roboto Mono\",monospace;font-size:12px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:#071522;margin:0 0 12px}.wkv-tiles{display:grid;gap:14px 10px;align-items:end}.wkv-c2{grid-template-columns:repeat(2,1fr);max-width:620px;margin:0 auto}.wkv-c3{grid-template-columns:repeat(3,1fr)}.wkv-c4{grid-template-columns:repeat(4,1fr)}.wkv-sep{border-top:1px solid rgba(7,21,34,.14);margin:24px 0 20px}.wkv-kit{display:grid;grid-template-columns:1fr 56px 1fr;gap:10px;align-items:center;justify-items:center}.wkv-kit svg:not(.wkv-arr){max-width:280px}.wkv-axis{display:flex;justify-content:space-between;gap:12px;border-top:2px solid #4a5563;margin-top:14px;padding-top:8px;font-family:\"Roboto Mono\",monospace;font-size:12px;color:#4a5563}@media (max-width:700px){.wkv-c4,.wkv-c3{grid-template-columns:repeat(2,1fr)}.wkv-c3>:last-child{grid-column:1\/-1;width:50%;justify-self:center}.wkv-kit{grid-template-columns:1fr}.wkv-kit svg:not(.wkv-arr){max-width:230px}.wkv-kit .wkv-arr{width:40px;transform:rotate(90deg)}.wkv-axis{font-size:11px}}<\/style><figure class=\"wkg-fig wkv\"><p class=\"wkv-k\">Rail types \u00b7 in section<\/p><div class=\"wkv-tiles wkv-c3\"><svg viewBox=\"-10 42 240 204\" role=\"img\" aria-label=\"Rail 50\/50 in section: soft \u00b7 forgiving\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><defs><marker id=\"wkv-ca0\" viewBox=\"0 0 10 10\" refX=\"8\" refY=\"5\" markerWidth=\"7\" markerHeight=\"7\" orient=\"auto-start-reverse\"><path d=\"M0,0 L10,5 L0,10 Z\" fill=\"#4a5563\"\/><\/marker><\/defs><path d=\"M0,60 L108,60 C152,60 172,78 172,100 C172,122 152,140 108,140 L0,140 Z\" fill=\"#d8bd91\"\/><path d=\"M0,60 L108,60 C152,60 172,78 172,100 C172,122 152,140 108,140 L0,140\" fill=\"none\" stroke=\"#071522\" stroke-width=\"2.5\"\/><line x1=\"0\" y1=\"60\" x2=\"0\" y2=\"140\" stroke=\"#4a5563\" stroke-width=\"1.5\" stroke-dasharray=\"4 4\"\/><path d=\"M10,156 L108,156 C150,156 180,136 186,104\" fill=\"none\" stroke=\"#4a5563\" stroke-width=\"2\" marker-end=\"url(#wkv-ca0)\"\/><circle cx=\"172\" cy=\"100\" r=\"6\" fill=\"#8fb21a\" stroke=\"#071522\" stroke-width=\"1.5\"\/><text x=\"6\" y=\"54\" text-anchor=\"start\" font-family=\"Roboto Mono,monospace\" fill=\"#4a5563\" font-size=\"12\">DECK<\/text><text x=\"6\" y=\"178\" text-anchor=\"start\" font-family=\"Roboto Mono,monospace\" fill=\"#4a5563\" font-size=\"12\">WATER<\/text><text x=\"110\" y=\"212\" text-anchor=\"middle\" font-family=\"Barlow Condensed,sans-serif\" font-weight=\"700\" fill=\"#071522\" font-size=\"24\">50\/50<\/text><text x=\"110\" y=\"236\" text-anchor=\"middle\" font-family=\"Roboto Mono,monospace\" fill=\"#4a5563\" font-size=\"14\">soft \u00b7 forgiving<\/text><\/svg><svg viewBox=\"-10 42 240 204\" role=\"img\" aria-label=\"Rail 60\/40 in section: in between\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><defs><marker id=\"wkv-ca1\" viewBox=\"0 0 10 10\" refX=\"8\" refY=\"5\" markerWidth=\"7\" markerHeight=\"7\" orient=\"auto-start-reverse\"><path d=\"M0,0 L10,5 L0,10 Z\" fill=\"#4a5563\"\/><\/marker><\/defs><path d=\"M0,60 L100,60 C152,60 172,96 172,118 C172,134 158,140 128,140 L0,140 Z\" fill=\"#d8bd91\"\/><path d=\"M0,60 L100,60 C152,60 172,96 172,118 C172,134 158,140 128,140 L0,140\" fill=\"none\" stroke=\"#071522\" stroke-width=\"2.5\"\/><line x1=\"0\" y1=\"60\" x2=\"0\" y2=\"140\" stroke=\"#4a5563\" stroke-width=\"1.5\" stroke-dasharray=\"4 4\"\/><path d=\"M10,156 L128,156 C160,156 180,142 186,120\" fill=\"none\" stroke=\"#4a5563\" stroke-width=\"2\" marker-end=\"url(#wkv-ca1)\"\/><circle cx=\"172\" cy=\"119\" r=\"6\" fill=\"#8fb21a\" stroke=\"#071522\" stroke-width=\"1.5\"\/><text x=\"110\" y=\"212\" text-anchor=\"middle\" font-family=\"Barlow Condensed,sans-serif\" font-weight=\"700\" fill=\"#071522\" font-size=\"24\">60\/40<\/text><text x=\"110\" y=\"236\" text-anchor=\"middle\" font-family=\"Roboto Mono,monospace\" fill=\"#4a5563\" font-size=\"14\">in between<\/text><\/svg><svg viewBox=\"-10 42 240 204\" role=\"img\" aria-label=\"Hard-edge rail in section: releases water cleanly\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><defs><marker id=\"wkv-ca2\" viewBox=\"0 0 10 10\" refX=\"8\" refY=\"5\" markerWidth=\"7\" markerHeight=\"7\" orient=\"auto-start-reverse\"><path d=\"M0,0 L10,5 L0,10 Z\" fill=\"#4a5563\"\/><\/marker><\/defs><path d=\"M0,60 L92,60 C145,60 172,95 174,138 L174,140 L0,140 Z\" fill=\"#d8bd91\"\/><path d=\"M0,60 L92,60 C145,60 172,95 174,138 L174,140 L0,140\" fill=\"none\" stroke=\"#071522\" stroke-width=\"2.5\"\/><line x1=\"0\" y1=\"60\" x2=\"0\" y2=\"140\" stroke=\"#4a5563\" stroke-width=\"1.5\" stroke-dasharray=\"4 4\"\/><path d=\"M10,156 L214,156\" fill=\"none\" stroke=\"#4a5563\" stroke-width=\"2\" marker-end=\"url(#wkv-ca2)\"\/><circle cx=\"174\" cy=\"140\" r=\"6\" fill=\"#8fb21a\" stroke=\"#071522\" stroke-width=\"1.5\"\/><text x=\"110\" y=\"212\" text-anchor=\"middle\" font-family=\"Barlow Condensed,sans-serif\" font-weight=\"700\" fill=\"#071522\" font-size=\"24\">HARD EDGE<\/text><text x=\"110\" y=\"236\" text-anchor=\"middle\" font-family=\"Roboto Mono,monospace\" fill=\"#4a5563\" font-size=\"14\">releases water cleanly<\/text><\/svg><\/div><div class=\"wkv-sep\"><\/div><p class=\"wkv-k\">In the WOODKIT kit \u00b7 you shape the rail by hand<\/p><div class=\"wkv-kit\"><svg viewBox=\"-6 304 248 192\" role=\"img\" aria-label=\"Before shaping: a block of Paulownia strips between the deck and bottom skins\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><rect x=\"150\" y=\"326\" width=\"80\" height=\"22\" fill=\"#d8bd91\"\/><rect x=\"150\" y=\"348\" width=\"80\" height=\"22\" fill=\"#e2cba5\"\/><rect x=\"150\" y=\"370\" width=\"80\" height=\"22\" fill=\"#d8bd91\"\/><rect x=\"150\" y=\"392\" width=\"80\" height=\"22\" fill=\"#e2cba5\"\/><line x1=\"150\" y1=\"348\" x2=\"230\" y2=\"348\" stroke=\"#071522\" stroke-width=\"1\"\/><line x1=\"150\" y1=\"370\" x2=\"230\" y2=\"370\" stroke=\"#071522\" stroke-width=\"1\"\/><line x1=\"150\" y1=\"392\" x2=\"230\" y2=\"392\" stroke=\"#071522\" stroke-width=\"1\"\/><line x1=\"150\" y1=\"326\" x2=\"150\" y2=\"414\" stroke=\"#071522\" stroke-width=\"1\"\/><rect x=\"0\" y=\"320\" width=\"230\" height=\"6\" fill=\"#b8965f\"\/><rect x=\"0\" y=\"414\" width=\"230\" height=\"6\" fill=\"#b8965f\"\/><rect x=\"0\" y=\"320\" width=\"230\" height=\"100\" fill=\"none\" stroke=\"#071522\" stroke-width=\"2\"\/><line x1=\"0\" y1=\"320\" x2=\"0\" y2=\"420\" stroke=\"#F2F2F0\" stroke-width=\"3\"\/><line x1=\"0\" y1=\"320\" x2=\"0\" y2=\"420\" stroke=\"#4a5563\" stroke-width=\"1.5\" stroke-dasharray=\"4 4\"\/><text x=\"75\" y=\"374\" text-anchor=\"middle\" font-family=\"Roboto Mono,monospace\" fill=\"#4a5563\" font-size=\"14\" letter-spacing=\"2\">HOLLOW<\/text><text x=\"8\" y=\"342\" font-family=\"Roboto Mono,monospace\" fill=\"#4a5563\" font-size=\"12\">deck skin<\/text><text x=\"8\" y=\"408\" font-family=\"Roboto Mono,monospace\" fill=\"#4a5563\" font-size=\"12\">bottom skin<\/text><text x=\"115\" y=\"462\" text-anchor=\"middle\" font-family=\"Barlow Condensed,sans-serif\" font-weight=\"700\" fill=\"#071522\" font-size=\"24\">BEFORE SHAPING<\/text><text x=\"115\" y=\"486\" text-anchor=\"middle\" font-family=\"Roboto Mono,monospace\" fill=\"#4a5563\" font-size=\"14\">Paulownia strips<\/text><\/svg><svg class=\"wkv-arr\" viewBox=\"0 0 64 24\" aria-hidden=\"true\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><defs><marker id=\"wkv-kb\" viewBox=\"0 0 10 10\" refX=\"8\" refY=\"5\" markerWidth=\"7\" markerHeight=\"7\" orient=\"auto-start-reverse\"><path d=\"M0,0 L10,5 L0,10 Z\" fill=\"#8fb21a\"\/><\/marker><\/defs><line x1=\"4\" y1=\"12\" x2=\"52\" y2=\"12\" stroke=\"#8fb21a\" stroke-width=\"4\" marker-end=\"url(#wkv-kb)\"\/><\/svg><svg viewBox=\"-6 304 248 192\" role=\"img\" aria-label=\"Finished rail: the strips shaped to the chosen profile\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><defs><clipPath id=\"wkv-kc\"><path d=\"M0,320 L150,320 C200,320 228,352 228,380 C228,404 210,420 172,420 L0,420 Z\"\/><\/clipPath><\/defs><g clip-path=\"url(#wkv-kc)\"><rect x=\"150\" y=\"326\" width=\"80\" height=\"22\" fill=\"#d8bd91\"\/><rect x=\"150\" y=\"348\" width=\"80\" height=\"22\" fill=\"#e2cba5\"\/><rect x=\"150\" y=\"370\" width=\"80\" height=\"22\" fill=\"#d8bd91\"\/><rect x=\"150\" y=\"392\" width=\"80\" height=\"22\" fill=\"#e2cba5\"\/><line x1=\"150\" y1=\"348\" x2=\"230\" y2=\"348\" stroke=\"#071522\" stroke-width=\"1\"\/><line x1=\"150\" y1=\"370\" x2=\"230\" y2=\"370\" stroke=\"#071522\" stroke-width=\"1\"\/><line x1=\"150\" y1=\"392\" x2=\"230\" y2=\"392\" stroke=\"#071522\" stroke-width=\"1\"\/><line x1=\"150\" y1=\"326\" x2=\"150\" y2=\"414\" stroke=\"#071522\" stroke-width=\"1\"\/><rect x=\"0\" y=\"320\" width=\"230\" height=\"6\" fill=\"#b8965f\"\/><rect x=\"0\" y=\"414\" width=\"230\" height=\"6\" fill=\"#b8965f\"\/><\/g><rect x=\"150\" y=\"320\" width=\"80\" height=\"100\" fill=\"none\" stroke=\"#4a5563\" stroke-width=\"1.5\" stroke-dasharray=\"5 4\"\/><path d=\"M0,320 L150,320 C200,320 228,352 228,380 C228,404 210,420 172,420 L0,420\" fill=\"none\" stroke=\"#071522\" stroke-width=\"2.5\"\/><line x1=\"0\" y1=\"320\" x2=\"0\" y2=\"420\" stroke=\"#F2F2F0\" stroke-width=\"3\"\/><line x1=\"0\" y1=\"320\" x2=\"0\" y2=\"420\" stroke=\"#4a5563\" stroke-width=\"1.5\" stroke-dasharray=\"4 4\"\/><text x=\"75\" y=\"374\" text-anchor=\"middle\" font-family=\"Roboto Mono,monospace\" fill=\"#4a5563\" font-size=\"14\" letter-spacing=\"2\">HOLLOW<\/text><text x=\"115\" y=\"462\" text-anchor=\"middle\" font-family=\"Barlow Condensed,sans-serif\" font-weight=\"700\" fill=\"#071522\" font-size=\"24\">FINISHED RAIL<\/text><text x=\"115\" y=\"486\" text-anchor=\"middle\" font-family=\"Roboto Mono,monospace\" fill=\"#4a5563\" font-size=\"14\">your own profile<\/text><\/svg><\/div><figcaption>Top: three rails in section and how water leaves each one (green dot: where it grips or releases). Bottom: the rail in the kit, Paulownia strips you shape by hand. Diagram, not to scale.<\/figcaption><\/figure><h2 id=\"cantos\">Rails: where the board grips<\/h2><div class=\"wkg-cols\"><div class=\"wkg-card\"><h3>What it is<\/h3><p>The edge section, from top face to bottom. It can be round and full (50\/50 type) or end in a sharper edge underneath.<\/p><\/div><div class=\"wkg-card\"><h3>In the water<\/h3><p>A round rail grips the wave face smoothly and forgives. A rail with an edge releases water cleanly and gives response and speed, especially in the back third. Many boards mix both: soft in front, edge behind.<\/p><\/div><\/div><p><strong>In a WOODKIT hollow board:<\/strong> the rails are Paulownia strips you shape by hand. It&#8217;s the most hand-crafted part of the build.<\/p><figure class=\"wkg-fig wkv\"><p class=\"wkv-k\">Bottom \u00b7 sections seen from the tail<\/p><div class=\"wkv-tiles wkv-c4\"><svg viewBox=\"-14 26 188 146\" role=\"img\" aria-label=\"Bottom: flat \u2014 neutral \u00b7 predictable\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M0,60 C10,34 150,34 160,60 L160,84 L0,84 Z\" fill=\"#d8bd91\" stroke=\"#071522\" stroke-width=\"2.5\" stroke-linejoin=\"round\"\/><path d=\"M0,84 L160,84\" fill=\"none\" stroke=\"#8fb21a\" stroke-width=\"4\"\/><text x=\"80\" y=\"108\" text-anchor=\"middle\" font-family=\"Roboto Mono,monospace\" fill=\"#4a5563\" font-size=\"12\"><\/text><text x=\"80\" y=\"140\" text-anchor=\"middle\" font-family=\"Barlow Condensed,sans-serif\" font-weight=\"700\" fill=\"#071522\" font-size=\"24\">FLAT<\/text><text x=\"80\" y=\"164\" text-anchor=\"middle\" font-family=\"Roboto Mono,monospace\" fill=\"#4a5563\" font-size=\"14\">neutral \u00b7 predictable<\/text><\/svg><svg viewBox=\"-14 26 188 146\" role=\"img\" aria-label=\"Bottom: concave \u2014 lift \u00b7 speed\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M0,60 C10,34 150,34 160,60 L160,86 C110,66 50,66 0,86 Z\" fill=\"#d8bd91\" stroke=\"#071522\" stroke-width=\"2.5\" stroke-linejoin=\"round\"\/><path d=\"M0,86 C50,66 110,66 160,86\" fill=\"none\" stroke=\"#8fb21a\" stroke-width=\"4\"\/><text x=\"80\" y=\"108\" text-anchor=\"middle\" font-family=\"Roboto Mono,monospace\" fill=\"#4a5563\" font-size=\"12\"><\/text><text x=\"80\" y=\"140\" text-anchor=\"middle\" font-family=\"Barlow Condensed,sans-serif\" font-weight=\"700\" fill=\"#071522\" font-size=\"24\">CONCAVE<\/text><text x=\"80\" y=\"164\" text-anchor=\"middle\" font-family=\"Roboto Mono,monospace\" fill=\"#4a5563\" font-size=\"14\">lift \u00b7 speed<\/text><\/svg><svg viewBox=\"-14 26 188 146\" role=\"img\" aria-label=\"Bottom: double concave \u2014 two channels\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M0,60 C10,34 150,34 160,60 L160,86 C140,68 100,68 80,80 C60,68 20,68 0,86 Z\" fill=\"#d8bd91\" stroke=\"#071522\" stroke-width=\"2.5\" stroke-linejoin=\"round\"\/><path d=\"M0,86 C20,68 60,68 80,80 C100,68 140,68 160,86\" fill=\"none\" stroke=\"#8fb21a\" stroke-width=\"4\"\/><text x=\"80\" y=\"108\" text-anchor=\"middle\" font-family=\"Roboto Mono,monospace\" fill=\"#4a5563\" font-size=\"12\"><\/text><text x=\"80\" y=\"140\" text-anchor=\"middle\" font-family=\"Barlow Condensed,sans-serif\" font-weight=\"700\" fill=\"#071522\" font-size=\"20\">DOUBLE CONCAVE<\/text><text x=\"80\" y=\"164\" text-anchor=\"middle\" font-family=\"Roboto Mono,monospace\" fill=\"#4a5563\" font-size=\"14\">two channels<\/text><\/svg><svg viewBox=\"-14 26 188 146\" role=\"img\" aria-label=\"Bottom: vee \u2014 rail to rail\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M0,60 C10,34 150,34 160,60 L160,80 L80,96 L0,80 Z\" fill=\"#d8bd91\" stroke=\"#071522\" stroke-width=\"2.5\" stroke-linejoin=\"round\"\/><path d=\"M0,80 L80,96 L160,80\" fill=\"none\" stroke=\"#8fb21a\" stroke-width=\"4\"\/><text x=\"80\" y=\"108\" text-anchor=\"middle\" font-family=\"Roboto Mono,monospace\" fill=\"#4a5563\" font-size=\"12\"><\/text><text x=\"80\" y=\"140\" text-anchor=\"middle\" font-family=\"Barlow Condensed,sans-serif\" font-weight=\"700\" fill=\"#071522\" font-size=\"24\">VEE<\/text><text x=\"80\" y=\"164\" text-anchor=\"middle\" font-family=\"Roboto Mono,monospace\" fill=\"#4a5563\" font-size=\"14\">rail to rail<\/text><\/svg><\/div><figcaption>Bottom sections, seen from the tail. Depths exaggerated so you can see them.<\/figcaption><\/figure><h2 id=\"fondo\">Bottom: how water runs underneath<\/h2><div class=\"wkg-cols\"><div class=\"wkg-card\"><h3>What it is<\/h3><p>The bottom&#8217;s cross-section: flat, concave (centre higher than the rails), double concave or vee (centre lower).<\/p><\/div><div class=\"wkg-card\"><h3>In the water<\/h3><p>Concave channels water and gives lift and speed. Vee makes rail-to-rail transitions easier, especially in the tail. A flat bottom is neutral and predictable.<\/p><\/div><\/div><p><strong>In a WOODKIT hollow board:<\/strong> bottom contours are cut into the lower profile of each rib, and the bottom skin follows them.<\/p><figure class=\"wkg-fig wkv\"><p class=\"wkv-k\">Nose<\/p><div class=\"wkv-tiles wkv-c2\"><svg viewBox=\"44 36 256 228\" role=\"img\" aria-label=\"Full nose: paddling \u00b7 stability\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><defs><pattern id=\"wkv-gn0\" width=\"8\" height=\"8\" patternUnits=\"userSpaceOnUse\"><rect width=\"8\" height=\"8\" fill=\"#b8965f\"\/><line x1=\"0\" y1=\"1\" x2=\"8\" y2=\"1\" stroke=\"#071522\" stroke-opacity=\".25\" stroke-width=\"2\"\/><\/pattern><clipPath id=\"wkv-pcn0\"><rect x=\"-1000\" y=\"-1000\" width=\"3000\" height=\"1100\"\/><\/clipPath><\/defs><path d=\"M80,196 C80,116 100,58 150,54 C200,58 220,116 220,196 Z\" fill=\"#d8bd91\"\/><path d=\"M80,196 C80,116 100,58 150,54 C200,58 220,116 220,196 Z\" fill=\"url(#wkv-gn0)\" clip-path=\"url(#wkv-pcn0)\"\/><path d=\"M80,196 C80,116 100,58 150,54 C200,58 220,116 220,196\" fill=\"none\" stroke=\"#071522\" stroke-width=\"2.5\"\/><line x1=\"80\" y1=\"100\" x2=\"220\" y2=\"100\" stroke=\"#071522\" stroke-width=\"1\" stroke-dasharray=\"3 3\"\/><line x1=\"80\" y1=\"196\" x2=\"220\" y2=\"196\" stroke=\"#4a5563\" stroke-width=\"1.5\" stroke-dasharray=\"4 4\"\/><line x1=\"214\" y1=\"80\" x2=\"236\" y2=\"80\" stroke=\"#4a5563\" stroke-width=\"1\"\/><text x=\"240\" y=\"76\" font-family=\"Roboto Mono,monospace\" font-weight=\"700\" fill=\"#071522\" font-size=\"12\">SOLID<\/text><text x=\"240\" y=\"91\" font-family=\"Roboto Mono,monospace\" font-weight=\"700\" fill=\"#071522\" font-size=\"12\">BLOCK<\/text><text x=\"150\" y=\"232\" text-anchor=\"middle\" font-family=\"Barlow Condensed,sans-serif\" font-weight=\"700\" fill=\"#071522\" font-size=\"24\">FULL<\/text><text x=\"150\" y=\"256\" text-anchor=\"middle\" font-family=\"Roboto Mono,monospace\" fill=\"#4a5563\" font-size=\"14\">paddling \u00b7 stability<\/text><\/svg><svg viewBox=\"44 36 256 228\" role=\"img\" aria-label=\"Pointed nose: manoeuvre \u00b7 less weight\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><defs><pattern id=\"wkv-gn1\" width=\"8\" height=\"8\" patternUnits=\"userSpaceOnUse\"><rect width=\"8\" height=\"8\" fill=\"#b8965f\"\/><line x1=\"0\" y1=\"1\" x2=\"8\" y2=\"1\" stroke=\"#071522\" stroke-opacity=\".25\" stroke-width=\"2\"\/><\/pattern><clipPath id=\"wkv-pcn1\"><rect x=\"-1000\" y=\"-1000\" width=\"3000\" height=\"1100\"\/><\/clipPath><\/defs><path d=\"M80,196 C80,136 120,74 150,46 C180,74 220,136 220,196 Z\" fill=\"#d8bd91\"\/><path d=\"M80,196 C80,136 120,74 150,46 C180,74 220,136 220,196 Z\" fill=\"url(#wkv-gn1)\" clip-path=\"url(#wkv-pcn1)\"\/><path d=\"M80,196 C80,136 120,74 150,46 C180,74 220,136 220,196\" fill=\"none\" stroke=\"#071522\" stroke-width=\"2.5\"\/><line x1=\"80\" y1=\"100\" x2=\"220\" y2=\"100\" stroke=\"#071522\" stroke-width=\"1\" stroke-dasharray=\"3 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text-anchor=\"middle\" font-family=\"Barlow Condensed,sans-serif\" font-weight=\"700\" fill=\"#071522\" font-size=\"24\">SWALLOW<\/text><\/svg><svg viewBox=\"0 316 190 194\" role=\"img\" aria-label=\"Round pin tail\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><defs><pattern id=\"wkv-gt2\" width=\"8\" height=\"8\" patternUnits=\"userSpaceOnUse\"><rect width=\"8\" height=\"8\" fill=\"#b8965f\"\/><line x1=\"0\" y1=\"1\" x2=\"8\" y2=\"1\" stroke=\"#071522\" stroke-opacity=\".25\" stroke-width=\"2\"\/><\/pattern><clipPath id=\"wkv-pct2\"><rect x=\"-1000\" y=\"408\" width=\"3000\" height=\"1000\"\/><\/clipPath><\/defs><path d=\"M30,326 C30,396 50,452 95,458 C140,452 160,396 160,326 Z\" fill=\"#d8bd91\"\/><path d=\"M30,326 C30,396 50,452 95,458 C140,452 160,396 160,326 Z\" fill=\"url(#wkv-gt2)\" clip-path=\"url(#wkv-pct2)\"\/><path d=\"M30,326 C30,396 50,452 95,458 C140,452 160,396 160,326\" fill=\"none\" stroke=\"#071522\" stroke-width=\"2.5\"\/><line x1=\"30\" y1=\"326\" x2=\"160\" y2=\"326\" stroke=\"#4a5563\" stroke-width=\"1.5\" stroke-dasharray=\"4 4\"\/><line x1=\"30\" y1=\"408\" x2=\"160\" y2=\"408\" stroke=\"#071522\" stroke-width=\"1\" stroke-dasharray=\"3 3\"\/><text x=\"95\" y=\"500\" text-anchor=\"middle\" font-family=\"Barlow Condensed,sans-serif\" font-weight=\"700\" fill=\"#071522\" font-size=\"24\">ROUND PIN<\/text><\/svg><svg viewBox=\"0 316 190 194\" role=\"img\" aria-label=\"Pin tail\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><defs><pattern id=\"wkv-gt3\" width=\"8\" height=\"8\" patternUnits=\"userSpaceOnUse\"><rect width=\"8\" height=\"8\" fill=\"#b8965f\"\/><line x1=\"0\" y1=\"1\" x2=\"8\" y2=\"1\" stroke=\"#071522\" stroke-opacity=\".25\" stroke-width=\"2\"\/><\/pattern><clipPath id=\"wkv-pct3\"><rect x=\"-1000\" y=\"408\" width=\"3000\" height=\"1000\"\/><\/clipPath><\/defs><path d=\"M30,326 C30,388 70,442 95,466 C120,442 160,388 160,326 Z\" fill=\"#d8bd91\"\/><path d=\"M30,326 C30,388 70,442 95,466 C120,442 160,388 160,326 Z\" fill=\"url(#wkv-gt3)\" clip-path=\"url(#wkv-pct3)\"\/><path d=\"M30,326 C30,388 70,442 95,466 C120,442 160,388 160,326\" fill=\"none\" stroke=\"#071522\" stroke-width=\"2.5\"\/><line x1=\"30\" y1=\"326\" x2=\"160\" y2=\"326\" stroke=\"#4a5563\" stroke-width=\"1.5\" stroke-dasharray=\"4 4\"\/><line x1=\"30\" y1=\"408\" x2=\"160\" y2=\"408\" stroke=\"#071522\" stroke-width=\"1\" stroke-dasharray=\"3 3\"\/><text x=\"95\" y=\"500\" text-anchor=\"middle\" font-family=\"Barlow Condensed,sans-serif\" font-weight=\"700\" fill=\"#071522\" font-size=\"24\">PIN<\/text><\/svg><\/div><div class=\"wkv-axis\"><span>\u2190 wide \u00b7 small waves<\/span><span>narrow \u00b7 powerful waves \u2192<\/span><\/div><figcaption>Noses and tails seen from above. The dark area is the solid block, shaped at the end.<\/figcaption><\/figure><h2 id=\"punta-cola\">Nose and tail<\/h2><div class=\"wkg-cols\"><div class=\"wkg-card\"><h3>What it is<\/h3><p>The ends of the board. At the tail, the shape (squash, round pin, swallow, pin) decides how it releases water.<\/p><\/div><div class=\"wkg-card\"><h3>In the water<\/h3><p>A full nose gives paddle power and stability; a pointy one, less weight up front and more manoeuvrability. A wide tail gives lift in small waves; a narrow one, hold in powerful waves.<\/p><\/div><\/div><p><strong>In a WOODKIT hollow board:<\/strong> nose and tail are solid blocks shaped at the end. They are kept as light as possible, because mass at the ends is what you feel most in a turn.<\/p><figure class=\"wkg-fig wkv\"><p class=\"wkv-k\">Fin set-ups \u00b7 seen from the bottom<\/p><div class=\"wkv-tiles wkv-c4\"><svg viewBox=\"0 12 190 306\" role=\"img\" aria-label=\"Single fin: long turns\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M17,20 L17,186 C17,228 37,246 69,248 L121,248 C153,246 173,228 173,186 L173,20 Z\" fill=\"#d8bd91\"\/><path d=\"M17,20 L17,186 C17,228 37,246 69,248 L121,248 C153,246 173,228 173,186 L173,20\" fill=\"none\" stroke=\"#071522\" stroke-width=\"2.5\"\/><line x1=\"17\" y1=\"20\" x2=\"173\" y2=\"20\" stroke=\"#4a5563\" stroke-width=\"1.5\" stroke-dasharray=\"4 4\"\/><line x1=\"95\" y1=\"20\" x2=\"95\" y2=\"248\" stroke=\"#071522\" stroke-width=\"1\" stroke-dasharray=\"5 5\" stroke-opacity=\".5\"\/><rect x=\"80\" y=\"150\" width=\"30\" height=\"82\" fill=\"#C5F135\" fill-opacity=\".25\" stroke=\"#8fb21a\" stroke-width=\"2\" stroke-dasharray=\"5 4\"\/><rect x=\"91\" y=\"162\" width=\"8\" height=\"58\" rx=\"4\" fill=\"#071522\" transform=\"rotate(0 95 191.0)\"\/><text x=\"95\" y=\"286\" text-anchor=\"middle\" font-family=\"Barlow Condensed,sans-serif\" font-weight=\"700\" fill=\"#071522\" font-size=\"24\">SINGLE<\/text><text x=\"95\" y=\"310\" text-anchor=\"middle\" font-family=\"Roboto Mono,monospace\" fill=\"#4a5563\" font-size=\"14\">long turns<\/text><\/svg><svg viewBox=\"0 12 190 306\" role=\"img\" aria-label=\"Twin fins: speed \u00b7 loose\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M17,20 L17,186 C17,228 37,246 69,248 L121,248 C153,246 173,228 173,186 L173,20 Z\" fill=\"#d8bd91\"\/><path d=\"M17,20 L17,186 C17,228 37,246 69,248 L121,248 C153,246 173,228 173,186 L173,20\" fill=\"none\" stroke=\"#071522\" stroke-width=\"2.5\"\/><line x1=\"17\" y1=\"20\" x2=\"173\" y2=\"20\" stroke=\"#4a5563\" stroke-width=\"1.5\" stroke-dasharray=\"4 4\"\/><line x1=\"95\" y1=\"20\" x2=\"95\" y2=\"248\" stroke=\"#071522\" stroke-width=\"1\" stroke-dasharray=\"5 5\" stroke-opacity=\".5\"\/><rect x=\"30\" y=\"126\" width=\"30\" height=\"58\" fill=\"#C5F135\" fill-opacity=\".25\" stroke=\"#8fb21a\" stroke-width=\"2\" stroke-dasharray=\"5 4\"\/><rect x=\"41\" y=\"138\" width=\"8\" height=\"34\" rx=\"4\" fill=\"#071522\" transform=\"rotate(5 45 155.0)\"\/><rect x=\"130\" y=\"126\" width=\"30\" height=\"58\" fill=\"#C5F135\" fill-opacity=\".25\" stroke=\"#8fb21a\" stroke-width=\"2\" stroke-dasharray=\"5 4\"\/><rect x=\"141\" y=\"138\" width=\"8\" height=\"34\" rx=\"4\" fill=\"#071522\" transform=\"rotate(-5 145 155.0)\"\/><text x=\"95\" y=\"286\" text-anchor=\"middle\" font-family=\"Barlow Condensed,sans-serif\" font-weight=\"700\" fill=\"#071522\" font-size=\"24\">TWIN<\/text><text x=\"95\" y=\"310\" text-anchor=\"middle\" font-family=\"Roboto Mono,monospace\" fill=\"#4a5563\" font-size=\"14\">speed \u00b7 loose<\/text><\/svg><svg viewBox=\"0 12 190 306\" role=\"img\" aria-label=\"Thruster: control\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M17,20 L17,186 C17,228 37,246 69,248 L121,248 C153,246 173,228 173,186 L173,20 Z\" fill=\"#d8bd91\"\/><path d=\"M17,20 L17,186 C17,228 37,246 69,248 L121,248 C153,246 173,228 173,186 L173,20\" fill=\"none\" stroke=\"#071522\" stroke-width=\"2.5\"\/><line x1=\"17\" y1=\"20\" x2=\"173\" y2=\"20\" stroke=\"#4a5563\" stroke-width=\"1.5\" stroke-dasharray=\"4 4\"\/><line x1=\"95\" y1=\"20\" x2=\"95\" y2=\"248\" stroke=\"#071522\" stroke-width=\"1\" stroke-dasharray=\"5 5\" stroke-opacity=\".5\"\/><rect x=\"28\" y=\"138\" width=\"30\" height=\"58\" fill=\"#C5F135\" fill-opacity=\".25\" stroke=\"#8fb21a\" stroke-width=\"2\" stroke-dasharray=\"5 4\"\/><rect x=\"39\" y=\"150\" width=\"8\" height=\"34\" rx=\"4\" fill=\"#071522\" transform=\"rotate(5 43 167.0)\"\/><rect x=\"132\" y=\"138\" width=\"30\" height=\"58\" fill=\"#C5F135\" fill-opacity=\".25\" stroke=\"#8fb21a\" stroke-width=\"2\" stroke-dasharray=\"5 4\"\/><rect x=\"143\" y=\"150\" width=\"8\" height=\"34\" rx=\"4\" fill=\"#071522\" transform=\"rotate(-5 147 167.0)\"\/><rect x=\"80\" y=\"190\" width=\"30\" height=\"52\" fill=\"#C5F135\" fill-opacity=\".25\" stroke=\"#8fb21a\" stroke-width=\"2\" stroke-dasharray=\"5 4\"\/><rect x=\"91\" y=\"200\" width=\"8\" height=\"32\" rx=\"4\" fill=\"#071522\" transform=\"rotate(0 95 216.0)\"\/><text x=\"95\" y=\"286\" text-anchor=\"middle\" font-family=\"Barlow Condensed,sans-serif\" font-weight=\"700\" fill=\"#071522\" font-size=\"24\">THRUSTER<\/text><text x=\"95\" y=\"310\" text-anchor=\"middle\" font-family=\"Roboto Mono,monospace\" fill=\"#4a5563\" font-size=\"14\">control<\/text><\/svg><svg viewBox=\"0 12 190 306\" role=\"img\" aria-label=\"Quad: speed + grip\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M17,20 L17,186 C17,228 37,246 69,248 L121,248 C153,246 173,228 173,186 L173,20 Z\" fill=\"#d8bd91\"\/><path d=\"M17,20 L17,186 C17,228 37,246 69,248 L121,248 C153,246 173,228 173,186 L173,20\" fill=\"none\" stroke=\"#071522\" stroke-width=\"2.5\"\/><line x1=\"17\" y1=\"20\" x2=\"173\" y2=\"20\" stroke=\"#4a5563\" stroke-width=\"1.5\" stroke-dasharray=\"4 4\"\/><line x1=\"95\" y1=\"20\" x2=\"95\" y2=\"248\" stroke=\"#071522\" stroke-width=\"1\" stroke-dasharray=\"5 5\" stroke-opacity=\".5\"\/><rect x=\"25\" y=\"128\" width=\"52\" height=\"104\" fill=\"#C5F135\" fill-opacity=\".25\" stroke=\"#8fb21a\" stroke-width=\"2\" stroke-dasharray=\"5 4\"\/><rect x=\"36\" y=\"138\" width=\"8\" height=\"34\" rx=\"4\" fill=\"#071522\" transform=\"rotate(5 40 155.0)\"\/><rect x=\"58\" y=\"186\" width=\"8\" height=\"32\" rx=\"4\" fill=\"#071522\" transform=\"rotate(3 62 202.0)\"\/><rect x=\"113\" y=\"128\" width=\"52\" height=\"104\" fill=\"#C5F135\" fill-opacity=\".25\" stroke=\"#8fb21a\" stroke-width=\"2\" stroke-dasharray=\"5 4\"\/><rect x=\"146\" y=\"138\" width=\"8\" height=\"34\" rx=\"4\" fill=\"#071522\" transform=\"rotate(-5 150 155.0)\"\/><rect x=\"124\" y=\"186\" width=\"8\" height=\"32\" rx=\"4\" fill=\"#071522\" transform=\"rotate(-3 128 202.0)\"\/><text x=\"95\" y=\"286\" text-anchor=\"middle\" font-family=\"Barlow Condensed,sans-serif\" font-weight=\"700\" fill=\"#071522\" font-size=\"24\">QUAD<\/text><text x=\"95\" y=\"310\" text-anchor=\"middle\" font-family=\"Roboto Mono,monospace\" fill=\"#4a5563\" font-size=\"14\">speed + grip<\/text><\/svg><\/div><figcaption>The dashed green area is the reinforcement block under each fin box.<\/figcaption><\/figure><h2 id=\"quillas\">Fins<\/h2><div class=\"wkg-cols\"><div class=\"wkg-card\"><h3>What it is<\/h3><p>The fins under the tail: one (single), two (twin), three (thruster) or four (quad), glassed-on or in boxes.<\/p><\/div><div class=\"wkg-card\"><h3>In the water<\/h3><p>They give hold and direction. A single gives long, smooth turns; a twin, speed and looseness; a thruster, control; a quad, speed with hold.<\/p><\/div><\/div><p><strong>In a WOODKIT hollow board:<\/strong> each fin box sits on a reinforcement block planned in the drawing, because in a hollow board there is no foam to spread the load.<\/p><p class=\"wkg-note\">Want to see how it all goes together piece by piece? It&#8217;s in <a href=\"https:\/\/woodkit.pro\/en\/how-it-is-built\/\">How it is built<\/a>. And if you wonder about the weight of the wood, we explain it in <a href=\"https:\/\/woodkit.pro\/en\/does-a-wooden-surfboard-float\/\">Does a wooden surfboard float differently?<\/a><\/p><h2 id=\"faq\">FAQ<\/h2><div class=\"wkg-faq\"><details><summary>What is surfboard rocker?<\/summary><p>The board&#8217;s curve seen from the side: how much the nose and tail lift from a flat surface. Low rocker gives speed and paddle power; more rocker, manoeuvrability in steep waves.<\/p><\/details><details><summary>What is foil?<\/summary><p>How thickness is spread from nose to tail. Two boards with the same maximum thickness can ride differently depending on how they spread it.<\/p><\/details><details><summary>What is the difference between a concave and a vee bottom?<\/summary><p>Concave channels water and gives lift and speed; vee makes rail-to-rail transitions easier, especially in the tail.<\/p><\/details><details><summary>Which parts of a hollow wooden board are shaped by hand?<\/summary><p>The rails and the nose and tail blocks. Rocker, foil and bottom contours are set by the frame.<\/p><\/details><\/div><section class=\"wkg-cta\"><h2>From anatomy to your board<\/h2><p>Every Signature kit brings the shaper&#8217;s design already turned into parts: rocker, foil and bottom come in the frame.<\/p><div class=\"wkg-btns\"><a class=\"wkg-btn p\" href=\"https:\/\/woodkit.pro\/en\/shop\/\">See Signature kits \u2192<\/a><a class=\"wkg-btn s\" href=\"https:\/\/woodkit.pro\/en\/how-it-is-built\/\">How it is built \u2192<\/a><\/div><\/section><div class=\"wkg-author\"><div class=\"wkg-av\">GE<\/div><div><p><strong>Guillermo Est\u00e9vez, founder of WOODKIT.PRO<\/strong><\/p><p>Fifteen years working with Paulownia, from nursery to board. He designs the wood side of every WOODKIT kit.<\/p><\/div><\/div><\/div><\/article><script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@graph\": [{\"@type\": \"Article\", \"headline\": \"Surfboard anatomy: every part and what it does in the water\", \"description\": \"A guide to the parts of a surfboard: outline, rocker, foil, rails, bottom contours, nose, tail and fins, and how each one is built in a hollow wooden board.\", \"author\": {\"@type\": \"Person\", \"name\": \"Guillermo Est\u00e9vez\", \"jobTitle\": \"Founder, WOODKIT.PRO\"}, \"publisher\": {\"@type\": \"Organization\", \"name\": \"WOODKIT.PRO\", \"url\": \"https:\/\/woodkit.pro\/\"}, \"inLanguage\": \"en\", \"dateModified\": \"2026-10-07\", \"mainEntityOfPage\": \"https:\/\/woodkit.pro\/en\/surfboard-anatomy\/\"}, {\"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is surfboard rocker?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The board's curve seen from the side: how much the nose and tail lift from a flat surface. 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