"51.0"^^ . "1.51198e+09"^^ . "Studied by Douglas Aircraft Company in 1965, this rocket consisted of a whole Saturn IB with 4 strap-on SRBs that have flown on the Titan 3E interplanetary missile carriers. All components of the vehicle have flown, but not together for this concept."@en . "Concept/study" . "3"^^ . . . "6.61"^^ . "Saturn IB-D"@en . . "3.3e+07"^^ .