RBCC - Credit: Boeing / Rocketdyne. 5,858 bytes. 211 x 103 pixels.

Rocket Based Combined-Cycle A5 Development Engine. Pressure-fed or pump-fed. The RBCC engine integrates rocket, air-augmented rocket, ramjet, and sramjet propulsion elements into a single flowpath. Rocket specific impulse 400 seconds; minimum thrust 600 lbs. Thrust and specific impulse values are at sea level.