Space Shuttle bipropellant RCS engine

A 'Reaction Control System' rocket engine is described which meets the Space Shuttle requirements. These include high performance/reliability and minimum weight with 100-mission life, with emphasis on reusability and minimum maintenance/servicing. The columbium fuel-vortex-cooled flight-type engine has a performance of 295 seconds vacuum specific impulse at 600 lbf thrust and a chamber pressure of 200 psia with maximum insulated-wall temperature below 2100 F. The engine has successfully demonstrated 9900 seconds operation including 6300 firing cycles without the need for maintenance.