Skip to content
79,433 pages · 13,741 images · since 1994 Browse A–Z Today in space history
Encyclopedia Astronautica The full story of spaceflight
Encyclopedia entry

RS-56-OSA

Engine · USA

Original archive entry. The text, images and links below are kept as they were written.

Delta Engine In Test
Delta Engine In Test
Hot test firing of Delta RS-56 engine.

Rocketdyne LOx/Kerosene rocket engine. Out of production. Designed for booster applications. Gas generator, pump-fed. Sustainer engine for Atlas II, IIA, IIAS. First flight 1991.

Thrust (sl): 269.000 kN (60,473 lbf). Thrust (sl): 27,430 kgf. Engine: 460 kg (1,010 lb). Chamber Pressure: 48.00 bar. Area Ratio: 25. Propellant Formulation: Lox/RP-1. Thrust to Weight Ratio: 85.6521739130435. Oxidizer to Fuel Ratio: 2.25. Coefficient of Thrust vacuum: 1.77414206044677. Coefficient of Thrust sea level: 1.27414206044677.

Country
USA
Launch Vehicles
Atlas II, Atlas IIA, Atlas IIAS
Propellants
Lox/Kerosene