ROOST ISI ROOST Improved ROOST Improved Specific Impulse Credit - © Mark Wade Gross Mass: 6,218,000 kg (13,708,000 lb). Empty Mass: 435,000 kg (959,000 lb). Thrust (vac): 101,842.000 kN (22,894,992 lbf). Isp: 455 sec. Burn time: 249 sec. Propellants: Lox/LH2. Isp(sl): 365 sec. Diameter: 21.30 m (69.80 ft). Span: 21.30 m (69.80 ft). Length: 67.10 m (220.10 ft). Country: USA. No Engines: 18. Engine: Chamber/single nozzle. Status: Study 1963. Cost $ : 154.000 million. Used on Launch Vehicles: ROOST ISI.                   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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