Aerojet’s Supersonic Engine Successful in Critical Flight Test

SACRAMENTO, Calif., Feb. 25, 2005 -- Aerojet, a GenCorp Inc. (NYSE: GY) Company, announced today that its ramjet engine once again met all test objectives in a third straight successful flight test conducted by Orbital Sciences Corporation as part of the U.S. Navy GQM-163A “Coyote” Supersonic Sea-Skimming Target missile program. Aerojet developed the world’s first variable flow ducted rocket ramjet and is the only company currently flight testing high speed missile propulsion for future U.S. military needs. The successful flight was the third in a series intended to validate the operation of the ramjet engine and target vehicle. Aerojet is responsible for the development and production of the ramjet engine that powers the Coyote missile during the extended high-speed cruise phase. The 108-second flight at Mach 2.5, the equivalent of traveling from Los Angeles to San Diego in under four minutes, included pre-programmed aggressive weaving maneuvers, dives, and climbs that provided valuable engine operating data. Additional flight-testing is planned in 2005 to complete the development program and enter full rate production.

“Aerojet’s ramjet technology is world-class and continues to prove its value for extended ranges, controllable thrust and affordable high speed,” said Aerojet President Mike Martin. “We are proud to be the leader in the development of innovative high-speed ramjet technologies designed to meet the military’s emerging reduced time-to-target needs.”

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 http://www.Aerojet.com and http://www.GenCorp.com.