{
  "schema": "project33.c6.design_point/1",
  "generator": "mechanism/spring_sizing.py",
  "units": {
    "v_egress": "m/s",
    "c_fin": "m",
    "S_fin": "m^2",
    "t_deploy": "s",
    "h_fin": "m",
    "m_fin": "kg",
    "k": "N*m/rad",
    "margin_fraction": "(k_supplied - k_min) / k_min"
  },
  "inputs": {
    "v_egress": 205.0,
    "c_fin": 0.12,
    "S_fin": 0.0216,
    "t_deploy": 0.05,
    "h_fin": 0.18,
    "m_fin": 0.154,
    "Cm_alpha_max": 0.8,
    "damping_ratio": 0.7
  },
  "model_assumptions": [
    "constant angular acceleration to 90 deg within t_deploy",
    "thin-rod fin inertia about its end",
    "peak aerodynamic hinge moment applied throughout deployment",
    "damping handled by dividing by (1 - damping_ratio), a heuristic inflation",
    "air density fixed at 1.225 kg/m^3"
  ],
  "k_min_N_m_rad": 184.8838,
  "k_supplied_N_m_rad": 220.0,
  "k_supplied_basis": "stated in source paper; not a measured spring rate",
  "margin_fraction": 0.189936
}