Author(s)

D.J. Chavez

Abstract

Recent tests by NASA have determined the possibility of accumulation of methylhydrazinium nitrate (MMH), a combustion product of the combination of hydrazine and nitrogen tetroxide (NTO) used to provide thrust for the Space Shuttle Orbiter, on the forward and aft reaction control system (RCS). This study determines the structural adequacy of an RCS cone subjected to a variety of MMH nitrate explosions. The results indicate that the cone may spall or yield with an MMH nitrate layer thickness of 75 mm (0.030 in.) or thicker. The thickness of the MMH nitrate layer should be monitored and removed when necessary. 1 Introduction Liquid MMH combined with NTO provide thrust in several small rockets used to propel or adjust spacecraft attitude. This study concerns the Orbi

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