{
 "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": "stuffing-tube",
 "name": "Stuffing tube",
 "kind": "standard",
 "category": "Boat design",
 "group": "Hull types",
 "year": null,
 "question": "What is a stuffing tube and how should it be routed?",
 "tags": [
  "vehicle design",
  "hull types",
  "rc design",
  "aerodynamics",
  "guide"
 ],
 "aliases": [
  "stuffing tube",
  "rc boat stuffing tube",
  "flex shaft tube",
  "stuffing tube angle",
  "stuffing tube seal",
  "drive tube",
  "shaft tube rc boat",
  "stuffing box"
 ],
 "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/stuffing-tube/",
 "sheet_txt": "https://xemstudio.com/objects/stuffing-tube/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": [
   "The stuffing tube carries the flex shaft from motor to strut through the hull and keeps water out. Keep it as straight as possible from hull exit to strut (Model Gas Boats).",
   "One RC mono uses a 7 mm x 210 mm tube with 31 mm exiting the transom; strut offset creates a slight S-bend (SV Design; Model Gas Boats forum)."
  ],
  "table": {
   "columns": [
    "parameter",
    "value or range",
    "source"
   ],
   "rows": [
    [
     "Stock tube",
     "7 mm dia x 210 mm, 31 mm exit",
     "SV Design (Stealthwake)"
    ],
    [
     "Exit target",
     "up to 57 mm (~10% of length)",
     "SV Design (Stealthwake)"
    ]
   ]
  }
 },
 "sheet_text": "Stuffing tube — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/stuffing-tube/  (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- The stuffing tube carries the flex shaft from motor to strut through the hull and keeps water out. Keep it as straight as possible from hull exit to strut (Model Gas Boats).\n- One RC mono uses a 7 mm x 210 mm tube with 31 mm exiting the transom; strut offset creates a slight S-bend (SV Design; Model Gas Boats forum).\n\nparameter  value or range  source\nStock tube  7 mm dia x 210 mm, 31 mm exit  SV Design (Stealthwake)\nExit target  up to 57 mm (~10% of length)  SV Design (Stealthwake)\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Model Gas Boats: Some tips on setting up a hydroplane hull — web — Publisher's page; dimensions are facts — https://modelgasboats.com/magazine/tech-articles-mainmenu-608/369-hydro-setup-tips\n- SV Design: Pro Boat Stealthwake upgrades info (Feb 2022) — web — Publisher's page; dimensions are facts — https://myplace.frontier.com/~sv_design/Pro%20Boat%20Stealthwakes%20Upgrades%20Info%20SVC_Feb-2022.pdf\n- Model Gas Boats forum: Need help setting up a mono for the first time — web — Publisher's page; dimensions are facts — https://www.modelgasboats.com/forum/13-ask-the-editors-discuss-articles-general-boat-questions/21138-need-help-setting-up-a-mono-for-the-first-time\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=stuffing-tube\n",
 "sources": [
  {
   "publisher": "Model Gas Boats",
   "title": "Some tips on setting up a hydroplane hull",
   "url": "https://modelgasboats.com/magazine/tech-articles-mainmenu-608/369-hydro-setup-tips",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "SV Design",
   "title": "Pro Boat Stealthwake upgrades info (Feb 2022)",
   "url": "https://myplace.frontier.com/~sv_design/Pro%20Boat%20Stealthwakes%20Upgrades%20Info%20SVC_Feb-2022.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Model Gas Boats forum",
   "title": "Need help setting up a mono for the first time",
   "url": "https://www.modelgasboats.com/forum/13-ask-the-editors-discuss-articles-general-boat-questions/21138-need-help-setting-up-a-mono-for-the-first-time",
   "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": [
  "deep-v-hull",
  "modified-v-hull",
  "flat-bottom-hull",
  "cathedral-tri-hull",
  "tunnel-hull-catamaran",
  "three-point-hydroplane"
 ],
 "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": "Seal it?",
   "a": "Silicone, or let it leak for racing (Model Gas Boats forum)."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/stuffing-tube/index.md"
}