A Lightweight Modular Solar Array Subsystem for ULDB Missions

The NASA Ultra-Long Duration Balloon (ULDB) program will extend the capabilities of the existing high-altitude scientific balloon program. ULDB objectives include developing a low-cost, integrated system capable of supporting operations above 100,000 feet for durations as long as 100 days. The ULDB power system must provide up to 2 kW for missions from polar to equatorial latitudes. Global Aerospace Corporation has examined power generation subsystem alternatives and has developed an innovative design which is lightweight and meets the requirements with a very low mass and cost. The major innovations proposed are: * Concept for two-axis Sun pointing which does not require rotation, * Lightweight mechanism for deploying and restowing a solar array, and * Lightweight solar array based upon solar-powered unmanned aerial vehicle programs.