>>3165039>>3165067>The inner structure was an aluminum sandwich construction which consisted of a welded aluminum inner skin, adhesively bonded aluminum honeycomb core, and outer face sheet. The thickness of the honeycomb varied from about 1.5 inches at the base to about 0.25 inches at the forward access tunnel. This inner structure – basically the crew compartment – was the pressurized portion.>The outer structure was made of stainless steel brazed honeycomb brazed between steel alloy face sheets. It varied in thickness from 0.5 inch to 2.5 inches. Part of the area between the inner and outer shells was filled with a layer of fiberglass insulation as additional heat protection.+ Heat shield on top of that.
