{
  "title": "M.M. Drake",
  "era": "Photographed later career form",
  "version": "1.1",
  "modelStatus": "Interpretive reconstruction; no original lines plan recovered",
  "detailLevel": "full",
  "units": "metres",
  "axes": {
    "up": "+Y",
    "bow": "-X",
    "starboard": "+Z"
  },
  "historicalDimensions": {
    "lengthFeet": 210,
    "beamFeet": 34.5,
    "depthOfHoldFeet": null,
    "beamInferred": false,
    "holdDepthUnknown": true,
    "dimensionsSourceQuality": "Selected documentary baseline; see vessel research notes for length and beam conflicts"
  },
  "geometryReference": {
    "hullBowX": -32.004000000000005,
    "hullSternX": 32.004000000000005,
    "deckY": 6.1,
    "waterlineY": 4.4,
    "waterlineIsInferred": true
  },
  "bounds": {
    "min": [
      -32.069755477022845,
      0.0050000000000000044,
      -5.395656588242689
    ],
    "max": [
      32.26650000000001,
      36.10352627715109,
      5.395656588242689
    ]
  },
  "triangleCount": 51372,
  "trianglesByGroup": {
    "hull": 12668,
    "bulwarks": 9716,
    "fittings": 2964,
    "deck": 8660,
    "propulsion": 206,
    "anchors": 636,
    "deckhouses": 7032,
    "pilothouse": 36,
    "steering": 412,
    "bridge_canopy": 136,
    "stern_gallery": 1282,
    "machinery": 392,
    "standing_rigging": 2280,
    "spars": 2048,
    "cargo_hatches": 180,
    "hatch_covers": 540,
    "hull_braces": 128,
    "ventilators": 240,
    "ship_boat": 1816
  },
  "drawCalls": 53,
  "mastCount": 2,
  "supportsSails": false,
  "visibilityNodes": {
    "hatches": "hatch_covers"
  },
  "deployedSailCount": 0,
  "inferredFeatures": [
    "Underwater hull lines and draft",
    "Exact colors, fittings, hatch layout and rigging routes"
  ],
  "configurationCaveat": "The photograph guides the forward pilothouse and canopy, unequal masts and aft funnel. Hull length uses 210 ft overall; the tracker’s 201 ft is length between perpendiculars. Hidden hull lines, hatch count, paint and the photo’s exact date remain uncertain.",
  "sources": [
    {
      "title": "Sterling Berry, M. M. Drake vessel history",
      "url": "https://www.greatlakesvesselhistory.com/histories-by-name/d/drake-m-m",
      "use": "Scale, original enrollment, 1885 second-deck alteration and career; distinguish LOA from LBP and conflicting depth entries."
    },
    {
      "title": "Historic M.M. Drake broadside",
      "url": "https://commons.wikimedia.org/wiki/File:M.M._Drake_%281882%29.jpg",
      "use": "Inspected visual reference for silhouette and exterior arrangement. Top of foremast is cropped; exact photo date is uncertain."
    },
    {
      "title": "Whitefish Point Underwater Preserve",
      "url": "https://www.michiganpreserves.org/whitefish-point-underwater-preserve/",
      "use": "Corroborates the named 1901 wreck entry; coordinates are not new survey data."
    }
  ],
  "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": [
    "Wooden bulk freighter US91485, built in 1882. [Sterling Berry, M. M. Drake vessel history](https://www.greatlakesvesselhistory.com/histories-by-name/d/drake-m-m)",
    "Vessel history explicitly gives 210 ft overall and 201 ft between perpendiculars, 34.5 ft beam; a second deck was added in 1885. [Sterling Berry, M. M. Drake vessel history](https://www.greatlakesvesselhistory.com/histories-by-name/d/drake-m-m)"
  ]
}