Proposed launch vehicle for large SDI 'Star Wars' payloads. Expected to cost $ 400-500 million, the Barbarian could place the Zenith-Star chemical laser into low earth orbit. It would consist of 3 Shuttle SRM's, attached around a ring of six Delta RS-27 first stage boosters, which in turn clustered around a single Delta first stage booster that was the last stage of the launch vehicle.

LEO Payload: 45,400 kg. to: 300 km Orbit. at: 28.0 degrees. Liftoff Thrust: 3,649,519 kgf. Total Mass: 2,500,000 kg. Core Diameter: 2.4 m. Total Length: 31.0 m. Launch Price $: 500.00 million. in 1987 price dollars.

• Stage Number: 0. 3 x Shuttle SRB Gross Mass: 589,670 kg. Empty Mass: 86,183 kg. Thrust (vac): 1,174,713 kgf. Isp: 269 sec. Burn time: 124 sec. Isp(sl): 237 sec. Diameter: 3.7 m. Span: 5.1 m. Length: 38.5 m. Propellants: Solid No Engines: 1. SRB

• Stage Number: 1. 6 x Delta Thor XLT-C Gross Mass: 101,900 kg. Empty Mass: 5,900 kg. Thrust (vac): 107,498 kgf. Isp: 302 sec. Burn time: 265 sec. Isp(sl): 255 sec. Diameter: 2.4 m. Span: 2.4 m. Length: 26.1 m. Propellants: Lox/Kerosene No Engines: 1. RS-27C

• Stage Number: 2. 1 x Delta Thor XLT-C Gross Mass: 101,900 kg. Empty Mass: 5,900 kg. Thrust (vac): 107,498 kgf. Isp: 302 sec. Burn time: 265 sec. Isp(sl): 255 sec. Diameter: 2.4 m. Span: 2.4 m. Length: 26.1 m. Propellants: Lox/Kerosene No Engines: 1. RS-27C

• 268 - Aviation Week and Space Technology, "SDI Considers Cluster Booster to Launch Zenith Star Spacecraft", 1987-11-30, page 20.