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Model: Diamant B-1. Gross Mass: 21,500 kg (47,300 lb). Empty Mass: 3,500 kg (7,700 lb). Thrust (vac): 396.522 kN (89,142 lbf). Isp: 251 sec. Burn time: 110 sec. Propellants: N2O4/UDMH. Isp(sl): 221 sec. Diameter: 1.40 m (4.50 ft). Span: 2.30 m (7.50 ft). Length: 14.08 m (46.19 ft). Country: France. No Engines: 4. Motor: Vexin C. Status: Out of production. Cost $ : 4.000 million. First Flight: 1970. Last Flight: 1975. No Launched: 11. Other designations: L-17. Used on Launch Vehicles: Diamant. Contact us with any corrections, additions, or comments. Conditions for use of drawings, pictures, or other materials from this site.. To contact astronauts or cosmonauts. © Mark Wade, 1997 - 2008 except where otherwise noted.