A Ramjet's fuel flow is metered by a hot gas valve prior to injection in the Ramjet Combustor.
The "Coyote" Supersonic Sea Skimming Target (SSST) is the only Ramjet Propulsion System in the U.S. currently operational and in production. Particularly, the SSST uses the VFDR Propulsion System.
The next generation SSST VFDR systems use an advanced VFDR fuel. Both the current State-of-the-Art and Next-Generational Fuel models feature 7-inch dual inlets and can achieve Mach 3.25 at 30,000 feet.
Press release | 08. 10. 2026
L3Harris Technologies has successfully completed a hot-fire test of its stage two advanced large solid rocket motor (SRM) for the Missile Defense Agency’s Next Generation Interceptor (NGI). L3Harris conducted the test as part of the Lockheed Martin team advancing the effort to strengthen the nation’s homeland missile defense.
