{
  "id": "ferretti_850",
  "name": "Ferretti 850",
  "type": "yacht_motor",
  "subtype": "planing",
  "length_overall_m": 26.04,
  "beam_max_m": 6.28,
  "draft_m": 1.98,
  "displacement_kg": 68000,
  "description": "Yate motor planeo italiano de 26 m, casco semi-V con propulsión convencional, 3 cubiertas, 4 cabinas + tripulación. Motores en V centrales, 2 gensets, A/A multizona. Tope típico ~30 nudos.",
  "data_source": "seed_estimate",
  "decks": [
    { "id": "lower", "name": "Cubierta inferior", "z_bl_bottom": 0.5, "z_bl_top": 2.7, "polygon_xy": [] },
    { "id": "main", "name": "Cubierta principal", "z_bl_bottom": 2.7, "z_bl_top": 4.9, "polygon_xy": [] },
    { "id": "flybridge", "name": "Flybridge", "z_bl_bottom": 4.9, "z_bl_top": 6.6, "polygon_xy": [] }
  ],
  "bulkheads": [
    { "id": "collision", "name": "Mamparo de colisión", "x_pp": 23.5, "description": "" },
    { "id": "er_fwd", "name": "Mamparo proa SM", "x_pp": 8.0, "description": "" },
    { "id": "er_aft", "name": "Mamparo popa SM", "x_pp": 4.0, "description": "" }
  ]
}