8J Calculation of Gravity Gradient/Radiation Pressure Compensating Structural Mass Requirements for Bicycle Wheel SPS It is easy to demonstrate that structural mass requirements to compensate for gravity gradient and radiation pressure forces are greater for a tensile (or compressive) situation than for forces perpendicular to the SPS surface. Thus, we conservatively assume the situation illustrated by Figure 1, where a cylindrical structural fiber is assumed to support the entire worst case force, calculated above, here symbolized by Fpeak- From Ref. 22,
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