Medium Class Strategic Propulsion Stages

The Medium Class Strategic Propulsion Stages program was structured to satisfy the Air Force’s objectives to demonstrate upper stage capability that meets future mission needs at the lowest life cycle (LCC). The specific program objective was to evaluate, develop, and demonstrate technologies for a sustainable SR-19 replacement. Aerojet  Rocketdyne completed two flawless static tests, one at sea level and one at simulated altitude. The motor is about 52 inches in diameter and 162 inches long, weighs about 14,361 lbs and produces an average thrust of over 80,000 lbs. The motor consists of a composite case (domestic fiber), solid-propellant fuel, igniter, nozzle with flex seal and thrust vector control using an electro-mechanical thrust vector actuator.

The Advanced Third Stage (A3S) program was structured to satisfy the Air Force’s objectives to demonstrate upper stage capability that meets future mission needs at the lowest life cycle (LCC). The specific program objective was to evaluate, develop, and demonstrate technologies for a sustainable SR-73 replacement. Aerojet  Rocketdyne completed design, development and case fabrication using domestic fiber.  The stage is about 52 inches in diameter and 92 inches long and is predicted to weigh about 8332 lbs with an action time of about 67 seconds. The motor consists of a composite case (domestic fiber), solid-propellant fuel, toroidal igniter, nozzle with flex seal and thrust vector control using an electro-mechanical thrust vector actuator.