{
  "title": "Goshawk",
  "era": "Photographed two-mast schooner-barge form after the 1904 Bay City rebuild",
  "version": "1.1",
  "modelStatus": "Interpretive reconstruction; no original lines plan recovered",
  "detailLevel": "full",
  "units": "metres",
  "axes": {
    "up": "+Y",
    "bow": "-X",
    "starboard": "+Z"
  },
  "historicalDimensions": {
    "lengthFeet": 180,
    "beamFeet": 32.4,
    "depthOfHoldFeet": 11.5,
    "beamInferred": false,
    "holdDepthUnknown": false,
    "dimensionsSourceQuality": "Alpena chronology,1904 rebuilt two-mast barge:180×32.4×11.5 ft; earlier measurements differ"
  },
  "geometryReference": {
    "hullBowX": -27.432000000000002,
    "hullSternX": 27.432000000000002,
    "deckY": 4.45,
    "waterlineY": 3.2,
    "waterlineIsInferred": true
  },
  "bounds": {
    "min": [
      -27.490319607982688,
      0.0050000000000000044,
      -5.027760000000001
    ],
    "max": [
      27.532000000000004,
      28.95387516014848,
      5.027760000000001
    ]
  },
  "triangleCount": 56890,
  "trianglesByGroup": {
    "hull": 12950,
    "bulwarks": 9586,
    "fittings": 2916,
    "deck": 8122,
    "steering": 424,
    "anchors": 636,
    "sheer_stripe": 3616,
    "forecastle_sides": 96,
    "deckhouses": 168,
    "cabin_roofs": 80,
    "windows": 360,
    "spars": 1784,
    "standing_rigging": 2256,
    "running_rigging": 168,
    "furled_canvas": 1320,
    "cargo_hatches": 180,
    "hatch_covers": 468,
    "deck_cargo": 8832,
    "ship_boat": 1816,
    "towing_gear": 1112
  },
  "drawCalls": 53,
  "mastCount": 2,
  "supportsSails": false,
  "visibilityNodes": {
    "cargo": "deck_cargo"
  },
  "deployedSailCount": 0,
  "inferredFeatures": [
    "Mast heights and stations, towing bitts, hawse fittings, hidden deck gear and cargo quantity are estimated from the own-vessel photograph.",
    "The earlier Lizzie A. Law comparison remains relevant to cut-down towbarge practice, but it is not direct Goshawk evidence.",
    "Paint pigments, underwater lines and working draft remain interpreted."
  ],
  "configurationCaveat": "Built in 1866; shown after the documented 1904 conversion from three masts to a two-mast barge. Own photographs guide the unequal masts, dark hull, pale bow works and aft steering shelter. Exact gear and hull lines are inferred; lumber versus salt at loss remains unresolved.",
  "revisedDate": "2026-09-08",
  "revisionNote": "Corrected the September 2026 audit findings and distinguished documentary evidence, interpretation and unresolved conflicts.",
  "documentedFeatures": [
    "Alpena’s vessel record gives construction by I. Lafrinier at Cleveland in 1866 as a wooden three-masted schooner and a 1904 rebuild at Bay City as a two-masted barge, then 180 × 32.4 × 11.5 ft. [Alpena vessel chronology](https://greatlakeships.org/2901559/data).",
    "The Louis Pesha photograph shows two unequal masts, a low aft cabin with a small raised steering shelter, a pale bow bulwark, dark hull with a narrow light stripe and a large deck load of lumber. These are observations of the photographed career form. [Pesha photograph, Edward J. Dowling Collection, University of Detroit-Mercy, via Alpena](https://greatlakeships.org/2901559/image/2209744).",
    "Goshawk foundered off Tawas on June 16, 1920 without loss of life. Swayze calls the vessel 54 years old and gives lumber as cargo. [Swayze, G](https://greatlakesrex.wordpress.com/g/)."
  ],
  "sources": [
    {
      "title": "Alpena vessel chronology",
      "url": "https://greatlakeships.org/2901559/data",
      "use": "See the cited evidence and uncertainty sections in the research notes."
    },
    {
      "title": "Louis Pesha photograph",
      "url": "https://greatlakeships.org/2901559/image/2209744",
      "use": "See the cited evidence and uncertainty sections in the research notes."
    },
    {
      "title": "Jack Messmer bow-view photograph",
      "url": "https://greatlakeships.org/2901559/image/2228285",
      "use": "See the cited evidence and uncertainty sections in the research notes."
    },
    {
      "title": "HCGL enrollment abstract, item 435544",
      "url": "https://greatlakes.bgsu.edu/item/435544",
      "use": "See the cited evidence and uncertainty sections in the research notes."
    },
    {
      "title": "Swayze G",
      "url": "https://greatlakesrex.wordpress.com/g/",
      "use": "See the cited evidence and uncertainty sections in the research notes."
    },
    {
      "title": "Lizzie A. Law comparative history",
      "url": "https://www.baillod.com/shipwreck/keweenaw/law.html",
      "use": "See the cited evidence and uncertainty sections in the research notes."
    },
    {
      "title": "UASC Wreck Checker, winter2005",
      "url": "https://www.uaschicago.org/index.php/publications/wreck-checker/2005-wreck-checkers/14-wreck-checker-vol-16-no-1-winter-2005?format=html",
      "use": "See the cited evidence and uncertainty sections in the research notes."
    }
  ],
  "builder": "Ira Lafrinier, Cleveland, 1866"
}