Mechanical/structural design implications of space-basing on shuttle system

A conceptual design study was conducted to identify some of the mechanical/structural differences which result from the use of a tug/payload combination in a space-basing mode as contrasted with a ground-based mode of operation. The basic mechanical/structural differences associated with space-basing were identified by analyzing a space-basing strategy in which the tug and payload are launched separately by the EOS and comparing it with the ground-based mode in which the tug/payload is launched as an integral unit in the EOS. This operational concept, which is the simplest of a number of possible space-basing strategies, was also used to identify the major impacts on the Earth Orbit Shuttle. The mechanical/structural differences that were identified from a comparison of payloads operating in the ground and space-based modes of operation are discussed in addition to delineating the advantages and disadvantages associated with various payload deployment/retrieval mechanisms.