Development of a low-cost, modular, reliable, Shuttle-launched payload booster

The Space Shuttle is an inexpensive, reliable vehicle for small satellite launch for the Air Force Space Test Program (STP). Unfortunately, typical Shuttle orbits have a limited lifetime due to their low altitudes. One way to allow the STP to take advantage of the low Shuttle space lift cost is to employ a small propulsion module to boost the STP satellite from the relatively low Shuttle orbit to a higher orbit. Current Propulsion Module (PM) technologies are expensive and have difficulties conforming to the man-rating requirements of the Shuttle. The Space Vehicles Directorate of the Air Force Research Laboratory (AFRL/VS) seeks to solve this problem by developing PM technologies that will lower costs, improve performance, and increase the reliability of these systems, facilitating approval to fly on the Shuttle. The AFRL/VS will fund the development of several innovative technology efforts to design this proposed propulsion system to meet the STP requirements. It must be a lightweight, maneuverable vehicle that also meets Shuttle safety requirements. This system will also be compatible with current Space Shuttle Hitchhiker Experiment Launch System (SHELS) configuration for mounting in the Space Shuttle cargo bay, i.e. weight and volume requirements. The PM will also have a re-startable motor and appropriate avionics to provide flexible orbit transfer support.