Gross Mass: 42,403 kg.
Empty Mass: 11,337 kg. Thrust (vac): 122,786 kgf. Isp: 273 sec. Burn time: 76 sec. Propellants: Lox/AlcoholIsp(sl): 242 sec. Diameter: 1.8 m. Span: 1.8 m. Length: 23.3 m. Country: USA. No Engines: 2. XLR-83-NA-1Status: Hardware. Other designations: XB-64, XSM-64. Comments: Burns out at altitude 13,000 m, Mach 3.