Innovative Aerojet Propulsion System Powers High-Speed Anti-Radiation Demonstration (HSAD) Flight Vehicle

SACRAMENTO, Calif., Aug. 19, 2008 – Aerojet, a GenCorp (NYSE: GY) company, announced today that its Integral Rocket Ramjet (IRR) propulsion system which incorporates a nozzleless booster and Variable-Flow Ducted Rocket (VFDR) ramjet technologies, powered a successful air-launched flight vehicle demonstration at White Sands Missile Range in New Mexico.

Aerojet's propulsion system, developed for the High-Speed Anti-Radiation Demonstration (HSAD) program, is designed to meet the evolving requirements for a long-range, reactive missile propulsion system with near-term transition to the war-fighter. The HSAD program is sponsored by the Office of Naval Research (ONR) Air Warfare and Naval Weapons Applications (Code 352) with the Naval Air Warfare Center Weapons Division/China Lake (NAWCWD/CL) serving as the program lead and system integrator.
For the flight test, the controlled test vehicle (CTV) was successfully rail-launched from a QF-4 drone aircraft, accelerated to supersonic speed, and transitioned to supersonic sustain-phase ramjet flight using Aerojet’s VFDR ramjet propulsion system. The VFDR ramjet system features a responsive energy-management capability that provides the CTV with active propulsion throughout the entire sustain flight enabling flight at speeds much higher than standard solid propellant rocket-powered systems.

The HSAD system passed a rigorous ground and environmental test program prior to flight. Using flight-weight hardware, these tests demonstrated the transition-readiness of the system. "What makes the HSAD program unique is that this high-performance propulsion system was manufactured and integrated into a war-fighter-class weight and size-compliant missile airframe,” said Gariel D. Randolph, PE, HSAD program manager. “We are truly excited about these results and for what they bring to future capabilities.” The HSAD all-solid propellant IRR design provides improved Munitions Safety and other benefits over standard solid propellant rockets. The VFDR flight test continues Aerojet’s leading role in the development of next-generation tactical propulsion for the U.S. military.

Aerojet is a world-recognized aerospace and defense leader principally serving the missile and space propulsion, defense and armaments markets. GenCorp is a leading technology-based manufacturer of aerospace and defense products and systems with a real estate segment that includes activities related to the entitlement, sale, and leasing of the company’s excess real estate assets. Additional information about Aerojet and GenCorp can be obtained by visiting the companies’ Web sites at and