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GEM
Family of stages.



Subtopics

GEM (abbreviation) Abbreviation for Giotto Extended Mission

GEM 40 Hercules solid rocket engine. Air-ignited versions have nozzle ratio of 16:1, specific impulse of 283.4 sec. Used on Delta 7925 launch vehicle. First flight 1990.

GEM 60 Hercules solid rocket engine. In production. Used as strap-on boosters for Delta 3 , Delta IV Medium. First flight 2002. Solid propellant rocket stage. 90.5 bar chamber pressure, 11.0 nozzle expansion ratio. Figures for TVC version. Fixed nozzle version is 599 kg lighter.

GEM 46 Hercules solid rocket engine. Air-ignited versions have nozzle ratio of 24.8:1, specific impulse of 284 sec. First flight 1998. Solid propellant rocket stage. Nine 1168-mm (46 in.) diameter Alliant graphite epoxy motors (GEM LDXLs) (strap-on solid rocket motors - SSRMs) augment the first-stage performance of the Delta III and were a direct evolution from the GEMs used on Delta II.



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