Stock Price: 132.20 -0.23 11/17/2017 4:02 PM ET

Stock Price: 132.20 -0.23 11/17/2017 4:02 PM ET

GEM Strap-on Booster System

Orbital ATK produces the Graphite Epoxy Motor (GEM) for use on United Launch Alliance’s (ULA) Delta IV and Delta II launch vehicles. The 60- and 40-inch-diameter GEM motors are strap-on booster systems that can fly in different configurations depending on payload requirements with either fixed or vectorable nozzles. These motors have 100% mission success with over 1,000 motors flown.

GEM 40 Strap-on Booster System

First flown in 1991, the 40-inch-diameter GEM 40 is a strap-on booster system developed to increase the payload-to-orbit capability of the Delta II vehicle. The GEM 40 flies in three, four or nine-motor configurations, depending on payload requirements. The three-motor and four-motor configurations are ground-ignited. The nine-motor configuration ignites six motors on the ground and three in the air. The GEM 40 also comes in a vectorable nozzle model.

GEM 60 Strap-on Booster System

Orbital ATK produces the Graphite Epoxy Motor for use on ULA's Delta IV launch vehicle. The 60-inch-diameter GEM 60 is a strap-on booster system that flies in two-motor or four-motor configurations, and with either fixed or vectorable nozzles.

The 53-foot motor flew on the inaugural flight of the Delta IV in 2002 in the first two-motor configuration and continues to support Delta IV launches on a regular basis. The first four-motor configuration flew in 2009. ATK developed the GEM 60 to increase the payload-to-orbit capability of the Delta IV M+ launch vehicles.

Cast in single a monolithic pour, this motor features a composite case, nose cone and aeroskirt. In the two-booster system configuration, both motors utilize vectorable nozzles, while the four-booster system operates with one fixed and one vectorable nozzle per side. The booster system is flown for the first 80 seconds of flight in either two- or four-motor configurations, providing 560,000 or 1.2 million pounds.

GEM 63 and GEM 63XL Strap-on Booster System

Orbital ATK is developing the next generation of the GEM family of strap-on boosters to support intermediate- and large-class space launch vehicles. These boosters build on the company’s extensive history of the successful GEM 40, GEM 46 and GEM 60 motors. The GEM 63 and GEM 63XL motors will be capable of supporting national security, science and commercial payloads. Orbital ATK is partnering with ULA to qualify these motors in 2018 to facilitate launches starting in 2019 supporting multiple customers.

GEM 63/GEM 63XL Fact Sheet

More Information
Orbital ATK Propulsion Systems Fact Sheet
Orbital ATK Motor Catalog