The Recoverable Booster Space System was a plan circulated in the early 1960's to use the XB-70 as a recoverable supersonic first stage for a range of systems. The XB-70 would be capable of orbiting a 6800 kg payload, or an X-20 manned space glider.

Manufacturer: North American. LEO Payload: 6,800 kg (14,900 lb). to: 160 km Orbit. at: 90.00 degrees. Other Associated Spacecraft: Dynasoar. Liftoff Thrust: 519.000 kN (116,675 lbf). Total Mass: 230,000 kg (500,000 lb). Core Diameter: 9.14 m (29.98 ft). Total Length: 56.40 m (185.00 ft). Span: 32.01 m (105.01 ft).