{
  "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.",
  "loaded_mass_status": "estimated, not measured",
  "estimated_dry_mass_kg": 3600,
  "estimated_fuel_mass_kg": 200,
  "estimated_people_cargo_mass_kg": 300,
  "reference_cg_status": "photo-based estimate, not measured",
  "drive_installation_verified": false
}