Pegasus-4 Gross Mass: 90 kg (198 lb). Empty Mass: 17 kg (37 lb). Thrust (vac): 666 N (149 lbf). Isp: 236 sec. Burn time: 241 sec. Propellants: Hydrazine. Isp(sl): 0 sec. Diameter: 0.97 m (3.18 ft). Span: 0.97 m (3.18 ft). Length: 0.25 m (0.82 ft). Country: USA. No Engines: 3. Engine: MR-107. Cost $ : 0.100 million. First Flight: 1990. Last Flight: 2004. No Launched: 11. Used on Launch Vehicles: Pegasus.                   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 - 2007 except where otherwise noted.

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