GEM 63XL Motors Will Help Launch Vulcan Centaur Rocket
Northrop Grumman Corporation recently conducted a validation ground test of an extended length 63-inch-diameter Graphite Epoxy Motor (GEM 63XL) in Promontory, Utah. This variation of the company’s GEM 63 strap-on booster was developed in partnership with United Launch Alliance (ULA) to provide additional lift capability to the Vulcan Centaur rocket.
“This new motor optimizes our best-in-class technologies and leverages flight-proven solid rocket propulsion designs to provide our customers with the most reliable product.”
Charlie Precourt, vice president, propulsion systems, Northrop Grumman.
“This new motor optimizes our best-in-class technologies and leverages flight-proven solid rocket propulsion designs to provide our customers with the most reliable product,” said Charlie Precourt, vice president, propulsion systems, Northrop Grumman. “Evolving the original GEM 63 design utilizes our decades of GEM strap-on booster expertise while enhancing capabilities for heavy-lift missions.”
During this static test, the GEM 63XL motor fired for approximately 90 seconds, producing nearly 449,000 pounds of thrust to validate the performance capability of the motor design. Additionally, this firing verified the motor’s internal insulation, propellant grain, ballistics and nozzle in a hot-conditioned environment.
Northrop Grumman has supplied rocket propulsion to ULA and its heritage companies for a variety of launch vehicles since 1964. The GEM family of strap-on motors was developed starting in the early 1980s with the GEM 40 to support the Delta II launch vehicle. The company then followed with the GEM 46 for the Delta II Heavy, and the GEM 60, which flew 86 motors over 26 Delta IV launches before retiring in 2019. The first GEM 63 motors supported ULA’s Atlas V rocket in November 2020.
According to Northrop Grumman, automation, robotics, commercial practices, and process controls are used to produce GEMs. Cases are filament wound by computer-controlled winding machines using high-strength graphite fiber and durable epoxy resin. Northrop Grumman is the largest producer of filament wound rocket motors in the world. Critical processes, such as case bond application, propellant mixing, motor casting, are performed using an extensive network of computerized and robotic facilities ensuring accurate control of manufacturing.
(Image provided with Northrop Grumman news release)