{
 "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": "apc-propeller-naming",
 "name": "Propeller naming suffixes (E, SF, MR, P, W, N, C)",
 "kind": "standard",
 "category": "Aircraft design",
 "group": "Propellers",
 "year": null,
 "question": "What do the letters on APC propellers mean?",
 "tags": [
  "vehicle design",
  "propellers",
  "rc design",
  "aerodynamics"
 ],
 "aliases": [
  "apc prop suffix",
  "apc sf meaning",
  "apc e prop meaning",
  "pusher prop p",
  "apc mr prop",
  "propeller naming",
  "apc prop codes",
  "slow flyer prop",
  "wide chord prop w"
 ],
 "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/apc-propeller-naming/",
 "sheet_txt": "https://xemstudio.com/objects/apc-propeller-naming/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": [
   "APC stamps diameter x pitch on the blade, followed by letters: E thin electric, F folding, MR multirotor, SF slow flyer, R reversible (all electric-only); W wide chord, N narrow, NN very narrow, P pusher/reverse rotation, C carbon (40% carbon / 60% nylon) (APC Nomenclature).",
   "No letters means a standard right-hand Sport prop for IC engines that can also be used on electric motors (APC).",
   "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": [
    [
     "E / F / MR / SF / R",
     "thin electric / folding / multirotor / slow flyer / reversible",
     "APC Nomenclature"
    ],
    [
     "W / N / NN",
     "wide / narrow / very narrow chord",
     "APC Nomenclature"
    ],
    [
     "P",
     "pusher (reverse rotation)",
     "APC Nomenclature"
    ],
    [
     "C",
     "40% carbon / 60% nylon by weight",
     "APC Nomenclature"
    ],
    [
     "No suffix",
     "standard right-hand Sport prop",
     "APC Nomenclature"
    ]
   ]
  }
 },
 "sheet_text": "Propeller naming suffixes (E, SF, MR, P, W, N, C) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/apc-propeller-naming/  (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- APC stamps diameter x pitch on the blade, followed by letters: E thin electric, F folding, MR multirotor, SF slow flyer, R reversible (all electric-only); W wide chord, N narrow, NN very narrow, P pusher/reverse rotation, C carbon (40% carbon / 60% nylon) (APC Nomenclature).\n- No letters means a standard right-hand Sport prop for IC engines that can also be used on electric motors (APC).\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\nE / F / MR / SF / R  thin electric / folding / multirotor / slow flyer / reversible  APC Nomenclature\nW / N / NN  wide / narrow / very narrow chord  APC Nomenclature\nP  pusher (reverse rotation)  APC Nomenclature\nC  40% carbon / 60% nylon by weight  APC Nomenclature\nNo suffix  standard right-hand Sport prop  APC Nomenclature\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- APC Propellers: APC Propeller Nomenclature — web — Publisher's page; dimensions are facts — https://www.apcprop.com/wp-content/uploads/2023/05/APC-Propeller-Nomenclature.pdf\n- Model Aviation (AMA), J. Smith with APC Propellers: Common Questions with APC Propellers (Mar 2021) — web — Publisher's page; dimensions are facts — https://www.modelaviation.com/node/2115\n\nFree files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/apc-propeller-naming/index.json\nAPI: https://xemstudio.com/api/geometry?object=apc-propeller-naming\n",
 "sources": [
  {
   "publisher": "APC Propellers",
   "title": "APC Propeller Nomenclature",
   "url": "https://www.apcprop.com/wp-content/uploads/2023/05/APC-Propeller-Nomenclature.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Model Aviation (AMA), J. Smith with APC Propellers",
   "title": "Common Questions with APC Propellers (Mar 2021)",
   "url": "https://www.modelaviation.com/node/2115",
   "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": [
  "propeller-diameter-vs-pitch",
  "pitch-diameter-ratio",
  "propeller-blade-count",
  "propeller-helix-angle-blade-twist",
  "propeller-slip-efficiency",
  "apc-propeller-rpm-limits"
 ],
 "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 an E prop OK on a glow engine?",
   "a": "No; electric props should only be used with electric motors (Model Aviation, APC Q&A)."
  }
 ],
 "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": "apc-propeller-naming-propeller",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "Xem Studio Design License",
   "step": "https://xemstudio.com/files/hardware/apc-propeller-naming/apc-propeller-naming-propeller.step",
   "stl": "https://xemstudio.com/files/hardware/apc-propeller-naming/apc-propeller-naming-propeller.stl",
   "note": "10×4.7 in propeller, 2 blades: each section set at the geometric pitch angle atan(P / 2πr); chord and section illustrative"
  }
 ],
 "markdown": "https://xemstudio.com/objects/apc-propeller-naming/index.md"
}