RS-27A
Rocket engine
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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 1.05 meganewtons of thrust burning RP-1 and LOX in a gas-generator cycle. Wikipedia
Diameter: 1.70 m (5.58 ft)
Thrust, sea-level: 890.1 kN (200,102 lbf)
Thrust, vacuum: 1,054.2 kN
Thrust-to-weight ratio: 102.47