{
  "source": "User-supplied update in this conversation",
  "loaded_mass_kg": 4100,
  "reference_cg_mm": 2750,
  "reference_cg_m": 2.75,
  "cg_datum": null,
  "cg_direction": null,
  "cg_requires_datum_confirmation": true,
  "engine_count": 1,
  "engine": "Volvo Penta D6-340",
  "propeller_reported": "Volvo Penta H6",
  "propeller_candidate": "Volvo Penta H8",
  "propeller_candidate_status": "User assumes H8 is appropriate; not validated",
  "drive_model": null,
  "gear_ratio": null,
  "measured_vertical_cg_m": null,
  "performance_validated": false,
  "note": "User corrected 3750 mm to 2750 mm. Supersedes the previous 3500 kg / D6-380 boat reference. Historical diagnostic cases retain their actual original inputs. The 2750 mm value must not be equated to the old aft-keel datum without confirmation.",
  "schema": "lw33-engineering-handoff-v1",
  "cg_measurement_axis": null,
  "vertical_cg_datum": null,
  "loaded_weight_breakdown": {
    "fuel_litres": null,
    "water_litres": null,
    "people_and_positions": null,
    "cargo_kg_and_positions": null,
    "equipment_included": null
  },
  "pitch_inertia_kg_m2": null,
  "measured_drafts_and_positions": null,
  "closure_geometry_confirmation": null,
  "drive_plate_photo_reference": null,
  "propeller_marking_photo_reference": null,
  "notes_for_engineers": "Fill unresolved fields; mark CG reference and direction on a drawing. Do not infer them from historical diagnostics."
}