{
 "version": "2026-10-20",
 "license": "Dimension sheets: CC BY 4.0. Standard and published-size files: CC BY 4.0. Xem Studio's own designs (files_license = Xem Studio Design License): free to use and sell things from, not to redistribute as files — https://xemstudio.com/license/. Other publishers' files: their own license, linked beside them.",
 "slug": "centreboard",
 "name": "Centreboard",
 "kind": "standard",
 "category": "Boat design",
 "group": "Sailboat appendages",
 "year": null,
 "question": "What is a centreboard?",
 "tags": [
  "vehicle design",
  "sailboat appendages",
  "rc design",
  "aerodynamics"
 ],
 "aliases": [
  "centreboard",
  "centerboard",
  "centerplate",
  "swing keel",
  "pivoting keel",
  "centreboard trunk",
  "dinghy centreboard",
  "centerboard vs daggerboard"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/centreboard/",
 "sheet_txt": "https://xemstudio.com/objects/centreboard/sheet.txt",
 "sheet": {
  "basis": "Design rules and figures from the cited sources; example geometry by Xem Studio",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "A centreboard pivots out of a slot in the hull; lowering it adds lateral lift, raising it reduces drag and allows shallow water and trailering (Wikipedia).",
   "It is more complex than a fixed keel and its case adds drag and takes interior space (Wikipedia).",
   "The file is a reference example built by Xem Studio from the numbers above (Illustrative.). Sizes the sources do not fix are illustrative; scale the example to your own vehicle."
  ],
  "table": {
   "columns": [
    "parameter",
    "value or range",
    "source"
   ],
   "rows": [
    [
     "Motion",
     "pivots",
     "Wikipedia (Centreboard)"
    ]
   ]
  }
 },
 "sheet_text": "Centreboard — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/centreboard/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)\nBasis: Design rules and figures from the cited sources; example geometry by Xem Studio\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A centreboard pivots out of a slot in the hull; lowering it adds lateral lift, raising it reduces drag and allows shallow water and trailering (Wikipedia).\n- It is more complex than a fixed keel and its case adds drag and takes interior space (Wikipedia).\n- The file is a reference example built by Xem Studio from the numbers above (Illustrative.). Sizes the sources do not fix are illustrative; scale the example to your own vehicle.\n\nparameter  value or range  source\nMotion  pivots  Wikipedia (Centreboard)\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Wikipedia: Centreboard — web — Publisher's page; dimensions are facts — https://en.wikipedia.org/wiki/Centreboard\n- Wikipedia: Daggerboard — web — Publisher's page; dimensions are facts — https://en.wikipedia.org/wiki/Daggerboard\n\nFree files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/centreboard/index.json\nAPI: https://xemstudio.com/api/geometry?object=centreboard\n",
 "sources": [
  {
   "publisher": "Wikipedia",
   "title": "Centreboard",
   "url": "https://en.wikipedia.org/wiki/Centreboard",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Wikipedia",
   "title": "Daggerboard",
   "url": "https://en.wikipedia.org/wiki/Daggerboard",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "fin-keel-bulb",
  "spade-rudder",
  "skeg-hung-rudder",
  "daggerboard",
  "canting-keel",
  "wing-sail"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no printing tolerance)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no printing tolerance. Where a part meets another part, the object lists its mating features (feature, exact size, what it mates with, fit class: press, slide, run, socket, clamp or designed). Apply your process's allowance to those features only; 'designed' gaps are part of the design and stay as drawn.",
 "mating": [],
 "faq": [
  {
   "q": "Why pivot?",
   "a": "So it can kick up on grounding and be partly raised (Wikipedia)."
  }
 ],
 "files_license": {
  "name": "Xem Studio Design License",
  "holder": "Xem Studio",
  "url": "https://xemstudio.com/license/",
  "note": "Xem Studio's own design: free to use, print, modify and sell things made from it; not to be republished or redistributed as files."
 },
 "offers": [
  {
   "file": "centreboard-appendage",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "Xem Studio Design License",
   "step": "https://xemstudio.com/files/hardware/centreboard/centreboard-appendage.step",
   "stl": "https://xemstudio.com/files/hardware/centreboard/centreboard-appendage.stl",
   "note": "centreboard: 300 mm deep, 60 mm chord, NACA 00-series foil"
  }
 ],
 "markdown": "https://xemstudio.com/objects/centreboard/index.md"
}