{"summary":{"count":26,"mean_signed_error_percent":19.193913731546555,"mean_absolute_error_percent":19.193913731546555,"median_absolute_error_percent":19.44005981626683,"worst_absolute_error_percent":29.410698826544184,"rank_correlation":0.8632478632478633},"cases":[{"icao_uid":"8RR043","name":"SPEY Mk511","manufacturer":"Rolls-Royce plc","bypass_ratio":0.64,"overall_pressure_ratio":19.9,"turbine_inlet_temperature_K":1318.4,"reference_tsfc_kg_per_N_s":0.000017534516765285997,"predicted_tsfc_kg_per_N_s":0.00002051314645357207,"error_percent":16.987235680101673},{"icao_uid":"1PW007","name":"JT8D-9","manufacturer":"Pratt & Whitney","bypass_ratio":1.04,"overall_pressure_ratio":15.88,"turbine_inlet_temperature_K":1254.08,"reference_tsfc_kg_per_N_s":0.00001612403100775194,"predicted_tsfc_kg_per_N_s":0.000019005764430692403,"error_percent":17.872289017274994},{"icao_uid":"1PW002","name":"JT3D-7","manufacturer":"Pratt & 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International","bypass_ratio":5.1,"overall_pressure_ratio":24.1,"turbine_inlet_temperature_K":1385.6,"reference_tsfc_kg_per_N_s":0.00001074262461851475,"predicted_tsfc_kg_per_N_s":0.000011770894861320436,"error_percent":9.571871673087013},{"icao_uid":"2GE038","name":"CF6-80C2A3","manufacturer":"GE Aircraft Engines","bypass_ratio":5.1,"overall_pressure_ratio":31.09,"turbine_inlet_temperature_K":1497.44,"reference_tsfc_kg_per_N_s":9.594996567767524e-6,"predicted_tsfc_kg_per_N_s":0.000011846806727127827,"error_percent":23.46858743988309},{"icao_uid":"3CM032","name":"CFM56-7B24","manufacturer":"CFM International","bypass_ratio":5.2,"overall_pressure_ratio":25.78,"turbine_inlet_temperature_K":1412.48,"reference_tsfc_kg_per_N_s":0.000010246168137482583,"predicted_tsfc_kg_per_N_s":0.000011672912013949714,"error_percent":13.924658050923538},{"icao_uid":"1IA001","name":"V2500-A1","manufacturer":"International Aero 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Whitney","bypass_ratio":11.58,"overall_pressure_ratio":38.07,"turbine_inlet_temperature_K":1609.12,"reference_tsfc_kg_per_N_s":6.945953286257468e-6,"predicted_tsfc_kg_per_N_s":8.734858428616757e-6,"error_percent":25.754638256762092}],"assumptions":{"fan_efficiency":0.89,"compressor_efficiency":0.88,"hp_turbine_efficiency":0.9,"lp_turbine_efficiency":0.9,"combustor_efficiency":0.99,"combustor_pressure_loss_fraction":0.05,"mechanical_efficiency":0.99,"core_nozzle_efficiency":0.95,"bypass_nozzle_efficiency":0.94,"inlet_pressure_recovery":0.98,"fuel_heating_value_J_kg":43000000.0,"total_mass_flow_air_kg_s":200.0},"validated_quantity":"Thrust-specific fuel consumption at the certified sea-level-static takeoff rating.","not_validated":"Absolute thrust. It scales with air mass flow, which the databank does not publish; back-solving mass flow from rated thrust would make the comparison circular. TSFC is very nearly mass-flow independent, so it is the honest figure of merit.","primary_source":"ICAO Aircraft Engine Emissions Databank, https://www.easa.europa.eu/en/domains/environment/icao-aircraft-engine-emissions-databank","intermediary_source":"OpenAP engine table, https://github.com/TUDelft-CNS-ATM/openap (LGPL-3.0). Used to read the databank in machine-readable form; no OpenAP code or file is redistributed here.","source_note":"Reference figures are the certified sea-level-static takeoff rating and fuel flow from the ICAO Aircraft Engine Emissions Databank, reached via the OpenAP engine table (TU Delft, LGPL-3.0). Each case keeps its ICAO engine UID so every number here can be checked against the primary source. Bypass ratio and overall pressure ratio are published inputs. Reference TSFC is derived arithmetically as fuel flow divided by rated thrust — it is not a PropulsionLab output and is not tuned. Nothing in this file is estimated: any quantity the databank does not publish (turbine inlet temperature, component efficiencies, mass flow) is supplied by the validation harness as a single fixed assumption set applied identically to every engine, never fitted per engine."}