8.3 A Structural Design to Increase Rigidity of a Bicycle Wheel SPS Consider the bicycle wheel SPS structural design presented in Figure 3. In this end-on representation, a hub is constructed at the geometrical center of the SPS. Loadbearing fibers run from the top (and bottom) of the hub to the rim. This arrangement can minimize warping of the array. From the top (or bottom), the arrangement of fibers is identical to that in Figure 2. Assuming 8 fibers on top and 8 on the bottom, fiber mass can be calculated by simply multiplying the values in Section 8.2 by 2: for terrestrial material, fiber mass = 0.056 kg; for lunar basalt or fiberglass, fiber mass = 0.38 kg; for lunar glass ceramic, fiber mass = 3.8 kg. We assume that the rim thickness is 4 times the fiber thickness. Since there are 16 fibers,
RkJQdWJsaXNoZXIy MTU5NjU0Mg==