{
 "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": "wing-sail",
 "name": "Rigid wing sail",
 "kind": "standard",
 "category": "Boat design",
 "group": "Sailboat appendages",
 "year": null,
 "question": "Why do some boats use rigid wing sails?",
 "tags": [
  "vehicle design",
  "sailboat appendages",
  "rc design",
  "aerodynamics",
  "guide"
 ],
 "aliases": [
  "wing sail",
  "wingsail",
  "rigid wing sail",
  "c class wing",
  "america's cup wing",
  "wing vs sail",
  "rc wing sail",
  "solid sail",
  "two element wing sail"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "not-scanned",
 "les": false,
 "free_files": 0,
 "url": "https://xemstudio.com/objects/wing-sail/",
 "sheet_txt": "https://xemstudio.com/objects/wing-sail/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 wingsail is a rigid or semi-rigid airfoil with independently adjustable segments, like an aircraft wing with flaps. It gives more lift and better lift-to-drag than soft sails (Wikipedia).",
   "At 30 deg apparent wind a wingsail works at ~10 deg angle of attack vs 15 deg for a jib and 20 deg for a mainsail. Drawbacks: it can't be reefed, must be removed ashore and costs more.",
   "Used on: C Class Catamaran, USA-17."
  ],
  "table": {
   "columns": [
    "parameter",
    "value or range",
    "source"
   ],
   "rows": [
    [
     "AoA at 30 deg apparent wind",
     "wing 10 deg; jib 15 deg; main 20 deg",
     "Wikipedia (Wingsail)"
    ]
   ]
  }
 },
 "sheet_text": "Rigid wing sail — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/wing-sail/  (sheet CC BY 4.0)\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 wingsail is a rigid or semi-rigid airfoil with independently adjustable segments, like an aircraft wing with flaps. It gives more lift and better lift-to-drag than soft sails (Wikipedia).\n- At 30 deg apparent wind a wingsail works at ~10 deg angle of attack vs 15 deg for a jib and 20 deg for a mainsail. Drawbacks: it can't be reefed, must be removed ashore and costs more.\n- Used on: C Class Catamaran, USA-17.\n\nparameter  value or range  source\nAoA at 30 deg apparent wind  wing 10 deg; jib 15 deg; main 20 deg  Wikipedia (Wingsail)\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Wikipedia: Wingsail — web — Publisher's page; dimensions are facts — https://en.wikipedia.org/wiki/Wingsail\n\nNo true-size file yet: the published figures do not fix the whole shape; a measured scan is planned.\nAPI: https://xemstudio.com/api/geometry?object=wing-sail\n",
 "sources": [
  {
   "publisher": "Wikipedia",
   "title": "Wingsail",
   "url": "https://en.wikipedia.org/wiki/Wingsail",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "not-scanned",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "fin-keel-bulb",
  "spade-rudder",
  "skeg-hung-rudder",
  "daggerboard",
  "centreboard",
  "canting-keel"
 ],
 "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": "Can it be reefed?",
   "a": "No, typically fixed area (Wikipedia)."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/wing-sail/index.md"
}