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Model: NB-52. Gross Mass: 177,273 kg (390,820 lb). Empty Mass: 70,545 kg (155,525 lb). Thrust (vac): 430.472 kN (96,774 lbf). Isp: 5,142 sec. Burn time: 48,000 sec. Propellants: Air/Kerosene. Isp(sl): 4,675 sec. Diameter: 14.72 m (48.29 ft). Span: 56.40 m (185.00 ft). Length: 47.74 m (156.62 ft). Country: USA. No Engines: 8. Motor: J57-19. Status: Active. Cost $ : 50.000 million. First Flight: 1954. Last Flight: 2004. No Launched: 14. Payload: 25,000 kg (55,000 lb). Release conditions: 880 kph at 11.5 km. Boeing Bomber-swept wing. Maximum release conditions: Wing mounted, 25,000 kg (19.1 m length x 6.7 m span) at 880 kph at 11,448 m altitude Used on Launch Vehicles:
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