6.38 Equating the angular momenta estimates of hull and shield, we find: wshield = (.l 2l) whull Thus the range of wshield would be .025 to .038 rad/sec (.24 to .36 RPM) in order to match the angular momentum of the hull spinning at 2 to 3 RPM. The ES group felt these spin rates were low enough that the shield would not require too much support structure. The above relation between wshield and whull would also equate Lshield and Lhull as predicted. If whull = .2712 radian/sec (.75g pseudogravity), then: .0329 radian/sec 2.87xlo 11 kg-m 2 / sec asteady state shield_ 75 g 8.72xl06 radi an The ES group decided to take advantage of the case of interest above and to devise a system to react the spinning hull against the counterspinning shield for precession. Since this design would apply forces to the shield through a mechanical contact between hull and shield, we called it a "closed bearing design". The system would, therefore, have to line up (within tolerances) the axis of symmetry of the hull with that of the shield and to precess both hull and shield. In this case, the relative rim velocity (between the hull's and shield's cylindrical sections) would be between 23.5 and 35.4
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