Happy Birthday Saturn V, Still The Biggest Rocket of All [Retromodo]
...Saturn V's ignition sequence has begun. Next, two outer engines are lit, followed 300 milliseconds later by the other two, ignited in pairs to avoid toppling the 364-foot rocket above. Nine seconds after all five engines go to full thrust, the first Saturn V rocket begins to lift from the launchpad, taking the unmanned Apollo 4 check-out...
