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Alliant Techsystems

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Make and model of engine

GEM strap-on booster
Engine statistics
Specification
Applications Strap-on booster for Delta II
Propellant 88% HTPB
Thrust (max) 144,533 lbf
Thrust (avg) 112,241 lb
Burn time 55.1 s
Specific Impulse
Total Impulse 7,090,000 lb-s
Chamber Pressure 817 psia
Weight 28,592 lb
Mass Fraction .91
Nozzle Expansion Ratio