7-8. Effect of shear stabilization cable size on bending stiffness...................................................................... 7-18 7-9. Effect of solar concentration ratio on structural cross section geometry..................................................... 7-20 7-10. Effect of structural geometry and longeron area on structural stiffness......................................... 7-21 7-11. Euler buckling loads versus longeron lengths...................... 7-22 7-12. Euler buckling loads versus beam length for selected heights................................................................................................ 7-23 7-13. Euler buckling loads versus beam truss length for selected heights........................................................ 7-23 7-14. Longitudinal girder load distribution for orbit transfer and attitude control thrust................................... 7-24 7-15. Electrical power distribution..................................................... 7-26 7-16. Individual solar array and conductor masses versus distribution losses.................................................. 7-27 7-17. Solar array plus conductor mass............................................ 7-27 7-18. Power distribution voltage trade ........................................ 7-29 7-19. SPS longitude shift due to perturbations .............................. 7-34 7-20. Electric propulsion performance and requirements .... 7-37 7-21. Relative SPS total mass versus LEO to GEO orbital transfer time........................................................... 7-38
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