GEM 46

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GEM 46

Part of GEM

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.

Status: Active. Number: 54 . Thrust: 608.10 kN (136,706 lbf). Gross mass: 19,290 kg (42,520 lb). Unfuelled mass: 2,280 kg (5,020 lb). Specific impulse: 274 s. Specific impulse sea level: 242 s. Burn time: 75 s. Height: 14.70 m (48.20 ft). Diameter: 1.17 m (3.83 ft).

Thrust (sl): 538.000 kN (120,947 lbf). Thrust (sl): 54,860 kgf. Chamber Pressure: 105.00 bar. Area Ratio: 14. Propellant Formulation: HTPB.

Country: USA. Launch Vehicles: Delta 8930, Delta 4M+(4,2), Delta 7920H, Delta 7925H, Delta 4M+(5,4), Delta 4M+(5,2). Propellants: Solid. Stages: GEM 46. Agency: Hercules. Bibliography: 455, 9665.

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