"Saturn V-B"@en . . "50.0"^^ . "2"^^ . "Concept/study" . "2.31332e+09"^^ . "Studied in 1968 by Marshall Space Flight Center, the Saturn V-B was considered an interesting vehicle concept because it nearly represents a single-stage to orbit booster, but is actually a stage and a half booster just like the Atlas. The booster would achieve liftoff via five regular F-1 engines; four of the five engines on the Saturn V-B would be jettisoned and could be fully recoverable, with the sustainer stage on the rocket continuing the flight into orbit."@en . . "10.06"^^ . . "2.26e+07"^^ .