{
  "physical_measurements": 0,
  "purpose": "Measure directional force, loss and outlet backpressure before assigning vehicle benefit.",
  "working_medium": "Dry air. Start with the existing regulated approximately 60 Pa plenum bench specification, not a vehicle-pressure or high-voltage test.",
  "modules": [
    {
      "outlet_angle_deg": 90,
      "metre_unit_seed_imported": true,
      "solid_count": 1,
      "solid_volume_m3": 5.506558730319587e-05,
      "closed_surface_edge_check": true,
      "feed_length_m": 0.18,
      "outlet_bore_m": 0.02764,
      "outlet_axis_in_bench_coordinates": [
        6.123233995736766e-17,
        0.0,
        1.0
      ],
      "outlet_centre_m": [
        0.09,
        0.0,
        0.11199999999999999
      ],
      "STEP": "upper-cassette-90deg.step",
      "surface_triangles": 8824
    },
    {
      "outlet_angle_deg": 120,
      "metre_unit_seed_imported": true,
      "solid_count": 1,
      "solid_volume_m3": 5.4411236278178946e-05,
      "closed_surface_edge_check": true,
      "feed_length_m": 0.18,
      "outlet_bore_m": 0.02764,
      "outlet_axis_in_bench_coordinates": [
        -0.4999999999999998,
        0.0,
        0.8660254037844387
      ],
      "outlet_centre_m": [
        0.04500000000000002,
        0.0,
        0.09994228634059948
      ],
      "STEP": "upper-cassette-120deg.step",
      "surface_triangles": 8720
    },
    {
      "outlet_angle_deg": 150,
      "metre_unit_seed_imported": true,
      "solid_count": 1,
      "solid_volume_m3": 5.083487860211795e-05,
      "closed_surface_edge_check": true,
      "feed_length_m": 0.18,
      "outlet_bore_m": 0.02764,
      "outlet_axis_in_bench_coordinates": [
        -0.8660254037844387,
        0.0,
        0.49999999999999994
      ],
      "outlet_centre_m": [
        0.012057713659400518,
        0.0,
        0.06699999999999999
      ],
      "STEP": "upper-cassette-150deg.step",
      "surface_triangles": 8042
    }
  ],
  "common_conditions": [
    "Hold the same inlet plenum total pressure and inlet temperature for the first comparison.",
    "Then compare at matched measured total source electrical power; those are separate controlled comparisons.",
    "Keep all three outlet bores identical and measure each actual geometry loss rather than assigning the vehicle K formula to this CAD.",
    "Measure mass flow, upstream/outlet static and total pressures, both horizontal/vertical reaction components, air temperatures and complete blower electrical input.",
    "Support the complete module on a calibrated two-axis balance; tare flexible-hose loads, pressure-induced hose loads and fixture background with appropriate controls.",
    "Use a separate controlled low-pressure outlet chamber for adverse-backpressure tests; record its power independently. Do not interpret ambient discharge as a forward-facing installed car outlet.",
    "Use the earlier matched warm/cold core with bypass in a later factorial experiment, recording bath heat and source power. Do not count a mass-flow gain as net energy.",
    "Use at least six randomised paired repeats per configuration after instrument calibration; retain raw traces, uncertainty and failed trials."
  ],
  "limits": [
    "CAD housings only; mounting, seals, pressure taps, fasteners, material qualification and force-balance fixtures need detailed design.",
    "The sharp intersecting-bore turn is deliberately measurable; no CFD-derived loss or optimised turning-vane claim is made.",
    "These parts are low-pressure bench design artifacts, not ready vehicle hardware.",
    "A mechanically verified metering/relief arrangement, rated blower, tubing and fixtures must follow the existing low-pressure bench design before fabrication."
  ]
}