{
  "title": "Benjamin Franklin",
  "era": "Early side-wheel steamer, c.1842–1850",
  "version": "1.1",
  "modelStatus": "Interpretive reconstruction; no original lines plan recovered",
  "detailLevel": "full",
  "units": "metres",
  "axes": {
    "up": "+Y",
    "bow": "-X",
    "starboard": "+Z"
  },
  "historicalDimensions": {
    "lengthFeet": 135,
    "beamFeet": 19.833333333333332,
    "depthOfHoldFeet": 9,
    "beamInferred": false,
    "holdDepthUnknown": false
  },
  "geometryReference": {
    "hullBowX": -20.574,
    "hullSternX": 20.574,
    "deckY": 2.95,
    "waterlineY": 2.05,
    "waterlineIsInferred": true
  },
  "bounds": {
    "min": [
      -20.62584779086404,
      0.0050000000000000044,
      -4.9176
    ],
    "max": [
      20.63356982004608,
      17.506490212960383,
      4.9176
    ]
  },
  "triangleCount": 43252,
  "trianglesByGroup": {
    "hull": 12668,
    "bulwarks": 9332,
    "fittings": 2620,
    "deck": 4600,
    "propulsion": 52,
    "anchors": 636,
    "paddle_wheels": 3888,
    "paddle_boxes": 912,
    "sponsons": 96,
    "deckhouses": 3456,
    "pilothouse": 816,
    "machinery": 384,
    "standing_rigging": 588,
    "skylights": 240,
    "ship_boat": 1816,
    "spars": 484,
    "cargo_hatches": 60,
    "hatch_covers": 96,
    "steering": 412,
    "seating": 96
  },
  "drawCalls": 58,
  "mastCount": 1,
  "supportsSails": false,
  "visibilityNodes": {
    "paddleboxes": "paddle_boxes"
  },
  "deployedSailCount": 0,
  "inferredFeatures": [
    "Underwater hull lines and draft",
    "Exact colors, fittings, hatch layout and rigging routes"
  ],
  "configurationCaveat": "Enrollment-based hull baseline: 135 ft long, 19 ft 10 in wide and 9 ft hold depth. Paddle wheels extend beyond hull beam. Surviving shafts establish side-wheel propulsion, but no intact hull or original arrangement drawing was recovered. Cabin, funnel, wheel diameter and one bare working mast are provisional.",
  "sources": [
    {
      "title": "NOAA Benjamin Franklin record",
      "url": "https://thunderbay.noaa.gov/shipwrecks/benjamin-franklin.html",
      "use": "Side-wheel propulsion, surviving machinery and dates"
    },
    {
      "title": "Enrollment scan via NOAA / Great Lakes Maritime Collection",
      "url": "https://thunderbay.noaa.gov/media/img/20210218-benjamin-franklin-enrollement-form-600.jpg",
      "use": "135 ft length, 19 ft 10 in breadth, 9 ft depth transcription; generic letterhead artwork excluded"
    }
  ],
  "revisedDate": "2026-09-08",
  "revisionNote": "Added sourced documentary features and repaired metadata and research-note formatting; this collection cleanup is not a new full historical or geometry audit.",
  "documentedFeatures": [
    "Enrollment dimensions 135 ft×19 ft 10 in×9 ft. [Enrollment scan via NOAA / Great Lakes Maritime Collection](https://thunderbay.noaa.gov/media/img/20210218-benjamin-franklin-enrollement-form-600.jpg)",
    "The enrollment identifies one deck. [Enrollment scan via NOAA / Great Lakes Maritime Collection](https://thunderbay.noaa.gov/media/img/20210218-benjamin-franklin-enrollement-form-600.jpg)"
  ]
}