| 词条 | RS-27A |
| 释义 |
|image=Tail of an Thor XLT Stage with the RS-27 A engine.jpg |image_size=150 |caption=RS-27A Engine on Delta II |name=RS-27A |country_of_origin=United States |designer=Rocketdyne |manufacturer=Rocketdyne, Pratt & Whitney Rocketdyne |date=1989 |purpose=Booster |predecessor=RS-27 |status=Retired |cycle=Gas Generator |type=liquid |fuel=RP-1 |oxidiser=LOX |capacity= |combustion_chamber=1 |nozzle_ratio= |thrust(SL)=890.1 kN (200,102 lbf) |thrust(Vac)=1,054.2 kN |specific_impulse_vacuum={{convert|302|isp}} |specific_impulse_sea_level={{convert|255|isp}} |chamber_pressure= 4.8MPa (700 psia) |thrust_to_weight=102.47 |burn_time= 265 Sec |diameter=1.70 m (5.58 ft) |length=3.78 m (12.40 ft) |dry_weight=1,147 kg (2,528 lb) |used_in = Delta 7000, first stage[1] }} The RS-27A is a liquid-fuel rocket engine developed in 1980s by Rocketdyne for use on the first stage of the Delta II and Delta III launch vehicles. It provides {{convert|1.05|MN|lbf}} of thrust burning RP-1 and LOX in a gas-generator cycle. The engine is a modified version of its predecessor, the RS-27;[2] its thrust nozzle has been extended to increase its area ratio from 8:1 to 12:1, which provides greater efficiency at altitude. The earlier RS-27 was derived from surplus Rocketdyne H-1 engines used in the Saturn 1B launcher.[3] The RS-27A main engine is neither restartable nor throttleable. In addition to its main engine, the RS-27A includes two vernier engines to provide vehicle roll control during flight.[4]{{failed verification|date=September 2018}}. The RS-27A, used as the main booster propulsion system for the Delta II family of launch vehicles, has an operational duration of 265 seconds. The RS-27A engine was retired at conclusion of the ICESat-2 launch on 15 September, 2018. References1. ^Astronautix: RS-27A Engine 2. ^Astronautix: RS-27 Engine 3. ^Astronautix: RS-27 Derivation on Delta 4. ^{{cite web |url=https://www.rocket.com/rs-27a-engine |title=RS-27A Engine |publisher=Aerojet Rocketdyne |accessdate=May 15, 2018 }} External links
4 : Rocketdyne engines|Rocket engines using the gas-generator cycle|Rocket engines using kerosene propellant|Rocket engines of the United States |
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