straints were found for the modified baseline configuration other than the cargo size limitation. For the ‘bow-tie' configuration however, it was determined that it is not a viable design for a growth option of the space station. The ‘butterfly' configuration is a possible alternative if the SDR is not offset with respect to the SDPM interface structure base plate. The thermal performance analysis showed no particular advantage of one configuration over another since the needed increase in area for the ‘bow-tie' and ‘butterfly' configurations, due to a decrease in view factor to the surrounding space environment, can be offset by modifying the SDR fluid flow path to a parallel-series- parallel loop fluid flow. However, there is a penalty imposed by both ‘bow-tie' and ‘butterfly' configurations in terms of drag effects because of their orientation with respect to the space station's direction of flight. The modified baseline configuration is the preferred option in terms of reboost fuel economy. In order to meet the desired first modal frequency, tension rods have been added to all three options. Additional masses will have to be added to make certain parts of the SDR more stiff. In the case of the ‘bow-tie' and ‘butterfly' configurations the mass increase is greater due to the addition of a second radiator base plate and deployment mechanism. Despite the fact that these two alternatives offer the possibility of reducing the concentrator reflective area (and concentrator mass), due to lack of shading, there remains an overall positive mass increase for these options that offsets this advantage. Conclusions Overall, it would be desirable to design a SDR that has only the most attractive features of each alternative design. However, as is typical in engineering problems, design and cost compromises must be made. Data presented in this paper show these compromises to be best embodied in the SDR modified baseline vertical configuration. ACKNOWLEDGEMENTS Work reported herein was sponsored by NASA/Lewis Research Center, Cleveland, OH, under Contract No. NAS3-25082. The author would like to thank numerous
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