The RS-27A is a
liquid-fuel rocket
A liquid-propellant rocket or liquid rocket utilizes a rocket engine that uses liquid rocket propellant, liquid propellants. Liquids are desirable because they have a reasonably high density and high Specific impulse, specific impulse (''I''sp). T ...
engine developed in 1980s by
Rocketdyne for use on the
first stage of the
Delta II and
Delta III launch vehicles. It provides of thrust burning
RP-1 and
LOX in a
gas-generator cycle. The engine is a modified version of its predecessor, the
RS-27; its thrust nozzle has been extended to increase its area ratio from 8:1 to 12:1, which provides greater efficiency at altitude.
The RS-27A main engine is neither restartable nor
throttleable. In addition to its main engine, it includes two
vernier engines to provide vehicle roll control during flight.
. When used as the main booster propulsion system for the Delta II family of launch vehicles, has an operational duration of 265 seconds.
The last RS-27A engine was used for the
ICESat-2 launch on 15 September, 2018.
References
External links
Aerojet Rocketdyne RS-27A Product Page
Pratt and Whitney RS-27A Brochure
{{Rocket engines
Rocketdyne engines
Rocket engines using the gas-generator cycle
Rocket engines using kerosene propellant
Rocket engines of the United States