Word: rl
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Dates: during 1960-1969
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Liquid hydrogen is the fuel for two important U.S. rocket engines-Pratt & Whitney's RL-10 and Rocketdyne's J2. The RL-10 powers the second stage of Saturn 1, scheduled for early Apollo flights; two RL-10s combine to form the Centaur stage of the Atlas-Centaur system built to soft-land Surveyor spacecraft on the moon. J-2 forms the second and third stages of the Saturn V designed for Apollo's man-carrying lunar missions. In the near future, violent but versatile liquid hydrogen may become still more familiar as a fuel for supersonic...
...bird's booster stage are training vehicles on which U.S. engineers are learning to handle the five much larger engines that will boost the Apollo spaceship on its voyage to the moon. Saturn's second stage teaches an even more difficult art. Its six Pratt & Whitney RL-10 engines burn liquid hydrogen, which is incredibly touchy to handle, but has an added efficiency that is considered essential for the moon project. The smooth success of last week's launch suggests that LH2 has at last become a routine fuel...
...upper and lower left chambers. Without such an operation, Mrs. Mauldin was not likely to live long. But the N.J.H. surgeons found they could not operate because Patient Mauldin would need transfusions during surgery, and she had rare, unmatchable blood: type A (common), but with a subfactor known as RL² (uncommon) and two other mysterious subfactors which, together, would destroy any blood that she might receive by transfusion. Reluctantly, the N.J.H. surgeons sent Lila Mauldin home...