GEM 63XL Static Test

Building the world's largest monolithic solid rocket motor.

The GEM 63XL static test motor installed into the test bay at the Promontory, Utah, facility Test Area.

Qualification Motor

This booster motor is being qualified to power ULA’s Vulcan Centaur launch vehicle with a design that leverages Northrop Grumman’s GEM 63 motor in an extended length configuration.

Press Releases

rocket being assembled in cleanroom

Northrop Grumman Delivers First GEM 63XL Solid Rocket Boosters to Support Vulcan First Flight

Northrop Grumman Successfully Completes Validation Test of New Rocket Motor for United Launch Alliance

The GEM 63XL motor fires at the Promontory facility’s Test Area.

Northrop Grumman Successfully Completes First Qualification Test of New Rocket Motor for United Launch Alliance


GEM 63XL VM-1 Static Test

Fact Sheets

GEM 63XL Qualification Motor Static Test Fact Sheet

GEM 63XL Validation Motor Static Test Fact Sheet

GEM News

The GEM 63XL motor ignites in its first static test firing.

Northrop Grumman test fires solid motor for ULA’s Vulcan rocket

rocket taking off from launch pad

Northrop Grumman Finalizes Contract for GEM Solid Rocket Boosters