{
 "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": "mh32-airfoil",
 "name": "MH 32 airfoil",
 "kind": "standard",
 "category": "Airfoils",
 "group": "Airfoils",
 "year": null,
 "question": "What is the MH 32 airfoil used for?",
 "tags": [
  "vehicle design",
  "airfoils",
  "rc design",
  "aerodynamics",
  "guide"
 ],
 "aliases": [
  "mh32",
  "mh 32 airfoil",
  "mh32 coordinates",
  "hepperle mh32",
  "f3b airfoil",
  "f3j airfoil",
  "mh32 dat",
  "rc glider airfoil",
  "mh32 flap"
 ],
 "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/mh32-airfoil/",
 "sheet_txt": "https://xemstudio.com/objects/mh32-airfoil/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": [
   "Martin Hepperle designed the MH 32 as a flapped airfoil for F3B and F3E models, intended to run negative flap for speed (MH-AeroTools).",
   "UIUC tests at Re 200,000-300,000 matched predictions for the upper laminar bucket; at Re above 100,000 drag rises below CL about 0.25, and Stuttgart tests extended useful range below zero lift with flap (MH-AeroTools).",
   "It remains a reference section: Model Aviation's soaring column compared newer F3J airfoils against the MH32 and SD7037 at Re 100k."
  ],
  "table": {
   "columns": [
    "parameter",
    "value or range",
    "source"
   ],
   "rows": [
    [
     "Design use",
     "flapped F3B / F3E",
     "MH-AeroTools"
    ],
    [
     "UIUC test Re",
     "200,000 and 300,000",
     "MH-AeroTools"
    ],
    [
     "Stuttgart (IAG) test Re",
     "100,000 and 200,000; flap -3, 0, 5, 10 deg",
     "MH-AeroTools"
    ],
    [
     "Lower bucket limit (Re > 1e5)",
     "CL about 0.25",
     "MH-AeroTools"
    ],
    [
     "LE geometry sensitivity",
     "0.25% chord deviation shifted bucket ~0.1-0.2 CL",
     "MH-AeroTools"
    ],
    [
     "Coordinates source",
     "MH-AeroTools airfoil pages",
     "MH-AeroTools"
    ]
   ]
  }
 },
 "sheet_text": "MH 32 airfoil — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/mh32-airfoil/  (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- Martin Hepperle designed the MH 32 as a flapped airfoil for F3B and F3E models, intended to run negative flap for speed (MH-AeroTools).\n- UIUC tests at Re 200,000-300,000 matched predictions for the upper laminar bucket; at Re above 100,000 drag rises below CL about 0.25, and Stuttgart tests extended useful range below zero lift with flap (MH-AeroTools).\n- It remains a reference section: Model Aviation's soaring column compared newer F3J airfoils against the MH32 and SD7037 at Re 100k.\n\nparameter  value or range  source\nDesign use  flapped F3B / F3E  MH-AeroTools\nUIUC test Re  200,000 and 300,000  MH-AeroTools\nStuttgart (IAG) test Re  100,000 and 200,000; flap -3, 0, 5, 10 deg  MH-AeroTools\nLower bucket limit (Re > 1e5)  CL about 0.25  MH-AeroTools\nLE geometry sensitivity  0.25% chord deviation shifted bucket ~0.1-0.2 CL  MH-AeroTools\nCoordinates source  MH-AeroTools airfoil pages  MH-AeroTools\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- MH-AeroTools (M. Hepperle): MH 32: Some Wind Tunnel Results — web — Publisher's page; dimensions are facts — https://mh-aerotools.de/airfoils/mh32exp.htm\n- Model Aviation (AMA): Radio Control Soaring column, July 2002 — web — Publisher's page; dimensions are facts — https://library.modelaviation.com/article/rc-aerobatics-25\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=mh32-airfoil\n",
 "sources": [
  {
   "publisher": "MH-AeroTools (M. Hepperle)",
   "title": "MH 32: Some Wind Tunnel Results",
   "url": "https://mh-aerotools.de/airfoils/mh32exp.htm",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Model Aviation (AMA)",
   "title": "Radio Control Soaring column, July 2002",
   "url": "https://library.modelaviation.com/article/rc-aerobatics-25",
   "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": [
  "clark-y-airfoil",
  "selig-s1223-airfoil",
  "eppler-e387-airfoil",
  "ag35-airfoil"
 ],
 "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": "Does MH 32 need flaps?",
   "a": "It was designed as a flapped section, using negative flap for speed runs (MH-AeroTools)."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/mh32-airfoil/index.md"
}