{
 "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": "differential-ailerons",
 "name": "Differential ailerons",
 "kind": "standard",
 "category": "Aircraft design",
 "group": "Control surfaces",
 "year": null,
 "question": "What are differential ailerons?",
 "tags": [
  "vehicle design",
  "control surfaces",
  "rc design",
  "aerodynamics"
 ],
 "aliases": [
  "differential ailerons",
  "aileron differential",
  "aileron differential percentage",
  "adverse yaw fix rc",
  "differential aileron throw",
  "more up than down aileron",
  "aileron differential glider",
  "transmitter aileron differential"
 ],
 "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/differential-ailerons/",
 "sheet_txt": "https://xemstudio.com/objects/differential-ailerons/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": [
   "Differential ailerons deflect the up-going aileron farther than the down-going one, adding drag on the descending wing; adverse yaw is reduced but not eliminated (FAA PHAK ch.6).",
   "Sadraey notes Piper aircraft generally use differential ailerons; a Cessna 182's 20 up / 14 down and a 777's 30 up / 10 down show the asymmetry (Sadraey Table 12.1).",
   "Used on: Cessna 182, Boeing 777-200, Piper aircraft (generally).",
   "The file is a reference example built by Xem Studio from the numbers above. Sizes the sources do not fix are illustrative; scale the example to your own vehicle."
  ],
  "table": {
   "columns": [
    "parameter",
    "value or range",
    "source"
   ],
   "rows": [
    [
     "Cessna 182 up/down",
     "20 / 14 deg",
     "Sadraey Table 12.1"
    ],
    [
     "Boeing 777-200 up/down",
     "30 / 10 deg",
     "Sadraey Table 12.1"
    ],
    [
     "Air Tractor AT-802 up/down",
     "17 / 13 deg",
     "Sadraey Table 12.1"
    ],
    [
     "Reference build",
     "chord 200, 20% aileron, 20 deg up",
     "Cessna 182 ratio"
    ]
   ]
  }
 },
 "sheet_text": "Differential ailerons — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/differential-ailerons/  (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- Differential ailerons deflect the up-going aileron farther than the down-going one, adding drag on the descending wing; adverse yaw is reduced but not eliminated (FAA PHAK ch.6).\n- Sadraey notes Piper aircraft generally use differential ailerons; a Cessna 182's 20 up / 14 down and a 777's 30 up / 10 down show the asymmetry (Sadraey Table 12.1).\n- Used on: Cessna 182, Boeing 777-200, Piper aircraft (generally).\n- The file is a reference example built by Xem Studio from the numbers above. Sizes the sources do not fix are illustrative; scale the example to your own vehicle.\n\nparameter  value or range  source\nCessna 182 up/down  20 / 14 deg  Sadraey Table 12.1\nBoeing 777-200 up/down  30 / 10 deg  Sadraey Table 12.1\nAir Tractor AT-802 up/down  17 / 13 deg  Sadraey Table 12.1\nReference build  chord 200, 20% aileron, 20 deg up  Cessna 182 ratio\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- FAA: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25), Ch. 6 Flight Controls — web — Publisher's page; dimensions are facts — https://www.faa.gov/sites/faa.gov/files/08_phak_ch6.pdf\n- Universidad de Sevilla course files (Sadraey, Aircraft Design, Ch. 12): Design of Control Surfaces (Aileron) — web — Publisher's page; dimensions are facts — https://aero.us.es/adesign/Slides/Extra/Stability/Design_Control_Surface/Chapter%2012.%20Desig%20of%20Control%20Surfaces%20%28Aileron%29.pdf\n\nFree files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/differential-ailerons/index.json\nAPI: https://xemstudio.com/api/geometry?object=differential-ailerons\n",
 "sources": [
  {
   "publisher": "FAA",
   "title": "Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25), Ch. 6 Flight Controls",
   "url": "https://www.faa.gov/sites/faa.gov/files/08_phak_ch6.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Universidad de Sevilla course files (Sadraey, Aircraft Design, Ch. 12)",
   "title": "Design of Control Surfaces (Aileron)",
   "url": "https://aero.us.es/adesign/Slides/Extra/Stability/Design_Control_Surface/Chapter%2012.%20Desig%20of%20Control%20Surfaces%20%28Aileron%29.pdf",
   "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": [
  "aileron",
  "frise-aileron",
  "elevon",
  "flaperon",
  "spoiler",
  "trim-tab"
 ],
 "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": "How much differential?",
   "a": "Full-size examples range from 20/14 deg (Cessna 182) to 30/10 deg (777) (Sadraey Table 12.1)."
  }
 ],
 "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": "differential-ailerons-wing-segment",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "Xem Studio Design License",
   "step": "https://xemstudio.com/files/hardware/differential-ailerons/differential-ailerons-wing-segment.step",
   "stl": "https://xemstudio.com/files/hardware/differential-ailerons/differential-ailerons-wing-segment.stl",
   "note": "aileron: wing segment 200 mm chord × 300 mm, 20 % chord surface deflected 20°"
  }
 ],
 "markdown": "https://xemstudio.com/objects/differential-ailerons/index.md"
}