Gross Mass: 76,870 kg.
Empty Mass: 16,780 kg. Thrust (vac): 208,854 kgf. Isp: 282 sec. Burn time: 90 sec. Propellants: Lox/KeroseneIsp(sl): 248 sec. Diameter: 2.4 m. Span: 2.4 m. Length: 27.4 m. Country: USA. No Engines: 3. LR-83-NA-1Status: Cancelled 1957. Other designations: XB-64A, XSM-64A. Comments: Burns out at altitude 21,600 m, Mach 3. Empty Mass estimated.