SSI Low Mass SPSs Built from Lunar Material

Cover	1
1. Introduction	2
2. Goals and Ground Rules for Study	2
3. Power Transmission	2
4. Choice of Materials	6
5. Bicycle Wheel Versus Inflatable Sphere SPS	7
6. System Efficiencies	8
7. SPS Size and Power Level	10
8. Structural Analysis	13
8.1 Calculation of Gravity Gradient Stresses and Radiation Pressure Stresses On Bicycle Wheel SPS	13
8.2 Calculation of Gravity Gradient/Radiation Pressure Compensating Structural Mass Requirements for Bicycle Wheel SPS	14
8.3 A Structural Design to Increase Rigidity of a Bicycle Wheel SPS	15
8.3.1 Justification of a 10-cm Hub Length	16
8.4 Thruster Support for Bicycle Wheel SPS	16
8.5 Calculation of Required Gas Masses for Inflatable Sphere SPS’s	18
9. Comparison of Old and New Reference Designs	21
10. Thin-Film SPS and Global Energy Requirements	24
11. Conclusions	27
12. Acknowledgments	27
13. References	28

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