{
 "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": "swan-neck-wing-mount",
 "name": "Swan-neck rear wing mount",
 "kind": "standard",
 "category": "Car design",
 "group": "Car aero",
 "year": null,
 "question": "Why do race cars hang the rear wing from swan-neck mounts?",
 "tags": [
  "vehicle design",
  "car aero",
  "rc design",
  "aerodynamics"
 ],
 "aliases": [
  "swan neck wing",
  "swan neck mount",
  "top mount wing",
  "top mounted rear wing",
  "swan neck vs bottom mount",
  "wing uprights",
  "hanging wing mounts",
  "reverse swan neck",
  "swan neck spoiler",
  "UCW swan neck"
 ],
 "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/swan-neck-wing-mount/",
 "sheet_txt": "https://xemstudio.com/objects/swan-neck-wing-mount/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 swan-neck mount holds the wing from its top (pressure) surface, leaving the underside clean. The underside of a car wing is the suction side that makes most of the downforce, and bottom mounts disturb that flow and cause early separation (HPA).",
   "In a 2009 LMP CFD study the same wing went from 1019 lb downforce on conventional mounts to 1299 lb on swan necks at similar drag, because the mount-induced separation disappeared (Mulsanne's Corner).",
   "HPA says conventional mounts are justified only by structural limits, rules or looks.",
   "Used on: Audi R15, Acura ARX-02a.",
   "The file is a reference example built by Xem Studio from the numbers above (2009 LMP wing box (Mulsanne's Corner); mount geometry illustrative.). Sizes the sources do not fix are illustrative; scale the example to your own vehicle."
  ],
  "table": {
   "columns": [
    "parameter",
    "value or range",
    "source"
   ],
   "rows": [
    [
     "Conventional mount, bespoke 2009 wing",
     "1019 lb downforce, 214 lb drag",
     "Mulsanne's Corner"
    ],
    [
     "Swan neck, same AoA",
     "1299 lb downforce, 186 lb drag",
     "Mulsanne's Corner"
    ],
    [
     "Swan neck, flap +8 deg",
     "1413 lb downforce, drag within 4% of 2008 car",
     "Mulsanne's Corner"
    ],
    [
     "Reverse swan neck (over trailing edge)",
     "1288 lb downforce, 186 lb drag",
     "Mulsanne's Corner"
    ],
    [
     "Downforce recovered by swan neck",
     "~280 lb at the same settings",
     "Mulsanne's Corner"
    ]
   ]
  }
 },
 "sheet_text": "Swan-neck rear wing mount — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/swan-neck-wing-mount/  (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 swan-neck mount holds the wing from its top (pressure) surface, leaving the underside clean. The underside of a car wing is the suction side that makes most of the downforce, and bottom mounts disturb that flow and cause early separation (HPA).\n- In a 2009 LMP CFD study the same wing went from 1019 lb downforce on conventional mounts to 1299 lb on swan necks at similar drag, because the mount-induced separation disappeared (Mulsanne's Corner).\n- HPA says conventional mounts are justified only by structural limits, rules or looks.\n- Used on: Audi R15, Acura ARX-02a.\n- The file is a reference example built by Xem Studio from the numbers above (2009 LMP wing box (Mulsanne's Corner); mount geometry illustrative.). Sizes the sources do not fix are illustrative; scale the example to your own vehicle.\n\nparameter  value or range  source\nConventional mount, bespoke 2009 wing  1019 lb downforce, 214 lb drag  Mulsanne's Corner\nSwan neck, same AoA  1299 lb downforce, 186 lb drag  Mulsanne's Corner\nSwan neck, flap +8 deg  1413 lb downforce, drag within 4% of 2008 car  Mulsanne's Corner\nReverse swan neck (over trailing edge)  1288 lb downforce, 186 lb drag  Mulsanne's Corner\nDownforce recovered by swan neck  ~280 lb at the same settings  Mulsanne's Corner\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Mulsanne's Corner: The Rise of the Swan Neck (2009 LMP rear wing CFD study) — web — Publisher's page; dimensions are facts — https://www.mulsannescorner.com/rearwingLMPCFD2009.html\n- High Performance Academy: Aerodynamic performance devices for club level cars: rear wing theory — web — Publisher's page; dimensions are facts — https://www.hpacademy.com/courses/aerodynamics-fundamentals/aerodynamic-performance-devices-for-club-level-cars-rear-wing-theory\n\nFree files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/swan-neck-wing-mount/index.json\nAPI: https://xemstudio.com/api/geometry?object=swan-neck-wing-mount\n",
 "sources": [
  {
   "publisher": "Mulsanne's Corner",
   "title": "The Rise of the Swan Neck (2009 LMP rear wing CFD study)",
   "url": "https://www.mulsannescorner.com/rearwingLMPCFD2009.html",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "High Performance Academy",
   "title": "Aerodynamic performance devices for club level cars: rear wing theory",
   "url": "https://www.hpacademy.com/courses/aerodynamics-fundamentals/aerodynamic-performance-devices-for-club-level-cars-rear-wing-theory",
   "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": [
  "rear-wing-single-element",
  "rear-wing-dual-element",
  "gurney-flap-wickerbill",
  "wing-endplates",
  "front-splitter",
  "splitter-tunnels-front-diffuser"
 ],
 "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": "Is a swan neck stronger?",
   "a": "Not inherently; HPA notes conventional mounts are chosen for structural strength or rules, while swan necks are chosen for aerodynamics."
  }
 ],
 "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": "swan-neck-wing-mount-rear-wing",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "Xem Studio Design License",
   "step": "https://xemstudio.com/files/hardware/swan-neck-wing-mount/swan-neck-wing-mount-rear-wing.step",
   "stl": "https://xemstudio.com/files/hardware/swan-neck-wing-mount/swan-neck-wing-mount-rear-wing.stl",
   "note": "swan neck rear wing: span 1600 × chord 250 mm at 6°, endplates 300 mm, inverted NACA 4412 section (mounts from above)"
  }
 ],
 "markdown": "https://xemstudio.com/objects/swan-neck-wing-mount/index.md"
}