{
 "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": "plus-frame",
 "name": "Plus (+) quad configuration",
 "kind": "standard",
 "category": "Drone design",
 "group": "Drone frame layouts",
 "year": null,
 "question": "What is a plus-configuration quadcopter?",
 "tags": [
  "vehicle design",
  "drone frame layouts",
  "rc design",
  "aerodynamics"
 ],
 "aliases": [
  "plus quad",
  "+ configuration",
  "plus frame",
  "cross quad",
  "quad plus",
  "plus vs x quad",
  "multiwii plus",
  "+ quadcopter"
 ],
 "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/plus-frame/",
 "sheet_txt": "https://xemstudio.com/objects/plus-frame/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 plus quad has one motor at front, back and each side. Orientation is easier and it flies 'like an airplane', but props are more likely to appear in camera (Oscar Liang).",
   "The file is a reference example built by Xem Studio from the numbers above (Reference 5-inch build: 220 mm diagonal within Grepow's 210-250 mm class for 5 in props.). Sizes the sources do not fix are illustrative; scale the example to your own vehicle."
  ],
  "table": {
   "columns": [
    "parameter",
    "value or range",
    "source"
   ],
   "rows": [
    [
     "Arms",
     "4, on + axes",
     "Oscar Liang"
    ]
   ]
  }
 },
 "sheet_text": "Plus (+) quad configuration — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/plus-frame/  (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 plus quad has one motor at front, back and each side. Orientation is easier and it flies 'like an airplane', but props are more likely to appear in camera (Oscar Liang).\n- The file is a reference example built by Xem Studio from the numbers above (Reference 5-inch build: 220 mm diagonal within Grepow's 210-250 mm class for 5 in props.). Sizes the sources do not fix are illustrative; scale the example to your own vehicle.\n\nparameter  value or range  source\nArms  4, on + axes  Oscar Liang\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Oscar Liang: Types of multicopter — web — Publisher's page; dimensions are facts — https://oscarliang.com/types-of-multicopter\n- r/multicopter wiki (mirror): Anatomy of a Multicopter — web — Publisher's page; dimensions are facts — https://r.datuan.dev/r/multicopter/wiki/anatomy\n\nFree files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/plus-frame/index.json\nAPI: https://xemstudio.com/api/geometry?object=plus-frame\n",
 "sources": [
  {
   "publisher": "Oscar Liang",
   "title": "Types of multicopter",
   "url": "https://oscarliang.com/types-of-multicopter",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "r/multicopter wiki (mirror)",
   "title": "Anatomy of a Multicopter",
   "url": "https://r.datuan.dev/r/multicopter/wiki/anatomy",
   "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": [
  "true-x-frame",
  "stretched-x-frame",
  "squashed-x-frame",
  "hybrid-x-frame",
  "deadcat-frame",
  "h-frame"
 ],
 "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 rare now?",
   "a": "Props in camera view (Oscar Liang)."
  }
 ],
 "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": "plus-frame-layout",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "Xem Studio Design License",
   "step": "https://xemstudio.com/files/hardware/plus-frame/plus-frame-layout.step",
   "stl": "https://xemstudio.com/files/hardware/plus-frame/plus-frame-layout.stl",
   "note": "plus frame layout: 220 mm motor-to-motor diagonal, 5 in props (discs show the swept area; arms and plate illustrative)"
  }
 ],
 "markdown": "https://xemstudio.com/objects/plus-frame/index.md"
}