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Topic: Upper stage

	Centaur (rocket stage) -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-29)
		proposed as a high energy upper stage for the (additional info and facts about Saturn I) Saturn I, (additional info and facts about Saturn IB) Saturn IB and (additional info and facts about Saturn V) Saturn V rockets.
		Centaur was the world's first high-energy upper stage.
		It burns liquid hydrogen ((additional info and facts about LH2) LH2) and liquid oxygen ((Brine-cured salmon) LOX), stored in balloon tanks, in either one or two RL-10 cryogenic rocket engines.
	www.absoluteastronomy.com /encyclopedia/c/ce/centaur_(rocket_stage).htm (287 words)

	RL-10 (rocket engine)
		Six RL-10 engines were used in the S-IV second stage of the Saturn I rocket.
		Two RL-10 engines are used in the Centaur upper stages of Atlas and Titan rockets.
		There were proposals to use RL-10 powered Centaur upper stages on Saturn I, Saturn IB and Saturn V rockets.
	www.brainyencyclopedia.com /encyclopedia/r/rl/rl_10__rocket_engine_.html (132 words)

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