{
 "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": "flat-bottom-hull",
 "name": "Flat-bottom hull",
 "kind": "standard",
 "category": "Boat design",
 "group": "Hull types",
 "year": null,
 "question": "What is a flat-bottom hull good for?",
 "tags": [
  "vehicle design",
  "hull types",
  "rc design",
  "aerodynamics"
 ],
 "aliases": [
  "flat bottom boat",
  "flat bottom hull",
  "jon boat hull",
  "flat hull planing",
  "shallow draft hull",
  "rc flat bottom boat",
  "scow hull",
  "flat bottom skiff"
 ],
 "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/flat-bottom-hull/",
 "sheet_txt": "https://xemstudio.com/objects/flat-bottom-hull/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 flat-bottom hull is very stable, has low draft, planes easily with little power and is cheap to build, but gives the bumpiest, wettest ride in waves (BoatTest).",
   "The bow may still have steep deadrise; transoms below 17 deg are described as flatter at the stern (BoatTest).",
   "Used on: Jon boats, Skiffs.",
   "The file is a reference example built by Xem Studio from the numbers above (Reference RC mono: 585 mm length and 20 deg transom deadrise (SV Design Stealthwake data); 181 mm is an unlabelled width in the same source's deadrise diagram.). Sizes the sources do not fix are illustrative; scale the example to your own vehicle."
  ],
  "table": {
   "columns": [
    "parameter",
    "value or range",
    "source"
   ],
   "rows": [
    [
     "Transom deadrise",
     "near 0 deg (below 17 deg = 'flatter')",
     "BoatTest"
    ]
   ]
  }
 },
 "sheet_text": "Flat-bottom hull — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/flat-bottom-hull/  (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 flat-bottom hull is very stable, has low draft, planes easily with little power and is cheap to build, but gives the bumpiest, wettest ride in waves (BoatTest).\n- The bow may still have steep deadrise; transoms below 17 deg are described as flatter at the stern (BoatTest).\n- Used on: Jon boats, Skiffs.\n- The file is a reference example built by Xem Studio from the numbers above (Reference RC mono: 585 mm length and 20 deg transom deadrise (SV Design Stealthwake data); 181 mm is an unlabelled width in the same source's deadrise diagram.). Sizes the sources do not fix are illustrative; scale the example to your own vehicle.\n\nparameter  value or range  source\nTransom deadrise  near 0 deg (below 17 deg = 'flatter')  BoatTest\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- BoatTest: To Deep-V or Not to Deep-V — web — Publisher's page; dimensions are facts — https://boattest.com/view-news/6472_To-Deep-V-or-Not-to-Deep-V\n\nFree files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/flat-bottom-hull/index.json\nAPI: https://xemstudio.com/api/geometry?object=flat-bottom-hull\n",
 "sources": [
  {
   "publisher": "BoatTest",
   "title": "To Deep-V or Not to Deep-V",
   "url": "https://boattest.com/view-news/6472_To-Deep-V-or-Not-to-Deep-V",
   "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": [
  "deep-v-hull",
  "modified-v-hull",
  "cathedral-tri-hull",
  "tunnel-hull-catamaran",
  "three-point-hydroplane",
  "stepped-hull"
 ],
 "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 so bumpy?",
   "a": "With no V the bottom slams flat onto waves (BoatTest)."
  }
 ],
 "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": "flat-bottom-hull-hull",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "Xem Studio Design License",
   "step": "https://xemstudio.com/files/hardware/flat-bottom-hull/flat-bottom-hull-hull.step",
   "stl": "https://xemstudio.com/files/hardware/flat-bottom-hull/flat-bottom-hull-hull.stl",
   "note": "flat hull, 585 × 181 mm, deadrise 0° (sections illustrative, scale to your boat)"
  }
 ],
 "markdown": "https://xemstudio.com/objects/flat-bottom-hull/index.md"
}