{
  "id": "patrol_coastal_30m",
  "name": "Patrullero costero 30 m",
  "type": "patrol",
  "subtype": "coastal",
  "length_overall_m": 30.0,
  "beam_max_m": 6.5,
  "draft_m": 1.6,
  "displacement_kg": 95000,
  "description": "Patrullero costero genérico 30 m. Casco semi-planeo aluminio, 2-3 motores planos rápidos, autonomía 800 nm. Equipos típicos: armamento ligero opcional, RHIB pop-up, búsqueda y rescate.",
  "data_source": "seed_estimate",
  "decks": [
    { "id": "lower", "name": "Cubierta inferior", "z_bl_bottom": 0.4, "z_bl_top": 2.4, "polygon_xy": [] },
    { "id": "main", "name": "Cubierta principal", "z_bl_bottom": 2.4, "z_bl_top": 4.6, "polygon_xy": [] },
    { "id": "wheelhouse", "name": "Caseta de gobierno", "z_bl_bottom": 4.6, "z_bl_top": 6.5, "polygon_xy": [] }
  ],
  "bulkheads": [
    { "id": "collision", "name": "Mamparo de colisión", "x_pp": 27.5, "description": "" },
    { "id": "er_fwd", "name": "Mamparo proa SM", "x_pp": 9.0, "description": "" },
    { "id": "er_aft", "name": "Mamparo popa SM", "x_pp": 4.0, "description": "" }
  ]
}