The Space Propulsion Group Inc. carried out a successful 11-sec. test firing of a developmental, 22-in. flight-class hybrid solid rocket motor fueled by paraffin and liquid oxygen on June 29 at its Butte, Mont., Aerotech test facility. The Sunnyvale, Calif.-based company, which was formed 13 years ago to develop low-cost, lightweight, environmentally friendly sources of space propulsion and power generation, carried out what was the fifth and longest in a series of test firings. The ...

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