Reference values

Design-underlying assumed values such as strength & cost of steel & concrete, G-tolerance of passengers, etc. should be declared on one page, for use in various pages ...

• motion:

  • "gee" (earth standard gravity): 1 gee = 9.8 m/sec2 = 9.8 N/kg = 9.8 J/kg.m
  • cruise_speed: 300? mph? = 150 m/sec
  • peak_speed: 700? mph? = 350 m/sec
  • minimum non-emergency capsule separation in time: 120 sec ?

• limits of motion allowable for passengers:

  • max longitudinal acceleration : 3? m/sec2 = 0.3 gee
  • max longitudinal deceleration : 5? m/sec2 = 0.5 gee
  • max subjective vertical acceleration: (w.r.t. 1.0 gee): 0.3? gee = 3 m/sec2
  • max external lateral acceleration in curve : 3? m/sec2 = 0.3? gee
  • max jerk longitudinal: 0.1? gee/sec , 1 m/sec3
  • max jerk vertical:
  • max rate of change of external lateral acceleration in curve:
  • max short-term jerk
  • max long-term jerkiness: 2-minute-average rms jerk in freq range {a..b} ?

• tube:

  • ID:
  • wall thickness:
  • material:
  • route length:
  • sharpest lateral curvature:
  • sharpest vertical curvature:

• Aluminum

  • density:
  • melting point:
  • semi-soft, (T6061), annealed or as cast:
    • strength:
    • half-strength temperature:
  • strengthened and hardened: T6061-t6:
    • strength:
    • half-strength temperature:

• Brass or brazing filler: density: typical strength: half-strength temperature: melting point:

• Steel:

  • Grade of steel commonly used in bridge construction:
  • Density of steel (most kinds in the same ballpark):
  • strength of common un-hardened steel:
  • Elasticity of steel (most kinds in the same ballpark):
  • Bulk cost of steel:
  • Melting point of elemental iron:
  • Temperature for losing 50% of yield strength:
  • saturation flux density:
  • typical permeability:

• Concrete:

  • compressive strength:
  • density:
  • cost per kg:
  • cost per m3:

• Water: (All heat generated in the pod is stored as Steam until end of trip:)

  • Density of water (liquid at 25C): kg/meter3
  • Density of water (liquid at 100C): kg/m3
  • Density of steam (at 100C & 1 atm) : kg/m3
  • Latent heat of boiling of water:
    • J/kg
    • J/meter3 (steam at 100C 1 atm)
  • Thermal capacity of water (liq. at 25C): J/kg.degC
  • Thermal capacity of dry steam (CP Constant Pressure, 100C 1 atm ):
    • J/kg/degC
    • J/m3.degC

• Air: (the fluid in the tube, being worked by fans & compressors)

• Lithium Batteries: power density:
  energy density:
  conflagration energy density (~2x higher than electrical energy density above):