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Study of an evolutionary interim earth orbit programAn evolutionary, gradual, and step-wise spacecraft systems technology development from those used on the Apollos and Skylab 1 to that required for the space station was considered. The four mission spacecraft were dry workshop versions of the Saturn 4-B stage, and each individually configured, outfitted and launched by INT-21 vehicles. These spacecraft were evaluated for crews of three, six and nine men and for mission lifetimes of one year. Two versions of the Apollo CSM, a three man and a four man crew, were considered as the logistic vehicle. The solar cell electrical power system of the first mission evolves into a light weight panel system supplemented by an operating isotope-Brayton system on the later missions. The open life support system of the first mission evolves to a system which recovers both water and oxygen on the last mission. The data handling, communications, radiation shielding, micrometeoroid protection, and orbit keeping systems were determined. The program costs were estimated and, excluding operational costs, the cost for each mission would average about $2 billion of which one-sixth would be for development, one-fourth for experiments, and the balance for vehicle acquisition.
Document ID
19730015118
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Anderson, J. L. (NASA Headquarters Washington, DC United States)
Alton, L. R. (NASA Headquarters Washington, DC United States)
Arno, R. D. (NASA Headquarters Washington, DC United States)
Deerwester, J. M. (NASA Headquarters Washington, DC United States)
Edsinger, L. E. (NASA Headquarters Washington, DC United States)
Sinclair, K. F. (NASA Headquarters Washington, DC United States)
Tindle, E. L. (NASA Headquarters Washington, DC United States)
Wood, R. D. (NASA Headquarters Washington, DC United States)
Date Acquired
September 2, 2013
Publication Date
April 6, 1971
Subject Category
Space Sciences
Report/Patent Number
NASA-TM-X-69243
MS-1
Accession Number
73N23845
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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