Exploring the Unknown: Selected Documents in ... - The Black Vault

Exploring the Unknown 105
orbital period, and with a proper corrugation depth and support spacing
can meet the other design requirements.
5.2.3 Heat and Acoustical Insulation – The shielding arrangement previously
described implies the use of insulation between the shields and the capsule
structure. This insulation must be able to withstand a transient temperature
pulse of fifteen hundred (1,500) degrees Fahrenheit, and not
deteriorate due to vibration. Transient heating calculations show that 3/8
lb/ft 2 of commercially available insulations should provide the required
heat protection to the capsule structure during the entry maneuver.
Heat soaked up by the structure must also be prevented form heating the
capsule contents. The insulation required on the inner wall must also be
effective in damping sound pressure waves. It is estimated that 1/8 lb/ft 2
of dual-purpose insulation should reduce the total heat transmitted to
the capsule contents to twenty-five (25) Btu/ft 2 of wall area during entry.
The combination of two metal walls and two insulation layers should be
capable of providing a 30 db reduction in noise at frequencies above six
hundred (600) cps.
[18]
6. ONBOARD EQUIPMENT
6.1 Capsule environment controls
6.1.1 General
6.1.1.1 Equipment shall be provided for control of the pressure, temperature,
and humidity within the capsule and within a suitable pressure suit to be
worn by the occupant.
6.1.1.2 Equipment shall be provided for the supply of breathing gas for the control
of the oxygen partial pressure and carbon dioxide concentration in
the breathing gas.
6.1.1.3 Equipment shall be provided for the control of the oxygen partial pressure
and the carbon dioxide concentration of the capsule atmosphere.
6.1.1.4 The foregoing equipment shall be as simple and passive in operation
as practical.
6.1.1.5 The absorptivity and emissivity of the capsule to radiation in the infrared
shall be such that the shell is basically cold and that only small heat
addition is required to maintain the internal temperature limits of the