Gross Mass: 4,331 kg (9,548 lb). Empty Mass: 416 kg (917 lb). Thrust (vac): 153.503 kN (34,509 lbf). Isp: 290 sec. Burn time: 73 sec. Propellants: Solid. Isp(sl): 240 sec. Diameter: 1.27 m (4.16 ft). Span: 1.27 m (4.16 ft). Length: 3.58 m (11.74 ft). Country: USA. No Engines: 1. Engine: Pegasus XL-2. Cost $ : 3.400 million. First Flight: 1994. Last Flight: 2006. No Launched: 33. No Failed: 1.