GE Aerospace reached an important milestone in its hypersonic propulsion development program by testing a solid-fuel ramjet at supersonic speeds over Florida’s Kennedy Space Center. The effort gives engineers direct data on how solid-fuel ramjets behave in flight. “This marks a pivotal moment for GE Aerospace as we showcase our solid-fuel ramjet technology in flight for the first time,” said Mark Rettig, Vice President and General Manager of Edison Works Business & Technology Development at GE Aerospace. Moscow has also worked on the Zircon sea-launched hypersonic cruise missile, which has undergone several flight tests. By proving that a solid-fuel ramjet can operate in real supersonic flight conditions, GE added a milestone to the broader U.S. effort to develop propulsion systems for future hypersonic weapons.