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Figures 4b to 4e – Details of Prototype Version 1

The principal investigators considered various potential fixes to these issues, but on further study concluded that a more major design refinement would be needed, to avoid the control and stability problems encountered with the initial prototype design. The test work on the pre- prototypes and on the initial prototype, indicated that a refined inflatable heliostat design with a reflective surface internal to a spherical inflatable and with a transparent upper surface, would be the most promising approach to pursue toward achieving a workable light-weight, low-cost inflatable heliostat that could avoid the pointing control problems encountered with the initial prototype’s toroid-above-sphere design. The preferred major design refinement with the reflective surface moved to an equatorial position within the base spherical inflatable, and with the upper covering surface of the inflatable being transparent, would clearly result in an

Page 12

November 24, 2002

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