{
  "study": "Benyo, NASA/TM-2011-217136, AIAA-2011-3591",
  "source_record": "https://ntrs.nasa.gov/citations/20110015567",
  "source_pdf": "https://ntrs.nasa.gov/api/citations/20110015567/downloads/20110015567.pdf",
  "source_pdf_sha256": "73D6F155BFFB791BF2A34D0BF65B53F0C28652D02B1BC67EF3551ECDE84CF718",
  "data_status": "Two specific-net-thrust endpoints transcribed exactly from the report text; no graph digitization, interpolation, or new calculation.",
  "values": [
    {
      "ambient_mach": 3.25,
      "specific_net_thrust_N_s_per_kg": 740,
      "locator": "printed p.13 / PDF p.17"
    },
    {
      "ambient_mach": 7,
      "specific_net_thrust_N_s_per_kg": 70,
      "locator": "printed p.13 / PDF p.17"
    }
  ],
  "selected_model_conditions": {
    "magnetic_field_T": 2.5,
    "generator_length_m": 3,
    "conductivity_S_per_m": "2 to 5.5 across Mach cases",
    "generator_power_output_MW": "45 to 90 across Mach cases",
    "power_allocations": {
      "accelerator_fraction": 0.9,
      "generator_preionizer_fraction": 0.05,
      "accelerator_preionizer_fraction": 0.05
    },
    "generator_isentropic_efficiency_assumption": 0.9
  },
  "important_limits": [
    "NPSS thermodynamic cycle simulation for a turbojet, not a built or flown scramjet.",
    "Specific net thrust and electrical output are model results, not measurements.",
    "The report leaves cost-benefit and vehicle sizing to future work; magnet mass, airframe drag, cooling and hardware feasibility are not closed.",
    "No uncertainty bounds are provided for these reported outputs.",
    "The plotted points are unconnected; no intermediate values are reproduced."
  ]
}