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RS-27A

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The RS-27A is a medium-sized rocket engine developed by Rocketdyne for use on the Delta II and Delta IIIs. It is fueled by a kerosene / LOX mixture 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.

Specifications

  • Thrust (vac): 237,000 lbf (1.05 MN)
  • Isp (vac): 302 s
  • Isp (sea level): 255 s
  • Mass: 2,528 lb (1,147 kg)
  • Diameter: 67 in (1.70 m)
  • Length: 12 ft 5 in (3.78 m)
  • Chambers: 2
  • Chamber pressure: 700 psia (4.8 MPa)
  • Area ratio: 12:1
  • Oxidizer to fuel ratio: 2.245:1
  • Thrust to Weight ratio: 93
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