The “V” stood for the five giant F-1 rocket engines—still the most powerful ever built—clustered at the bottom of the Saturn V’s first stage. At one point a four-engine version ...

The Saturn V rocket was the largest rocket ever at ... When fully fueled, the second stage weighed 1.06 million pounds and was responsible for accelerating the rocket through the upper atmosphere.

In April 1965, engineers install five 1.5-million-pound-thrust F-1 rocket engines on a Saturn V stage for a static test. In the spring of 2003, construction was nearing completion at the Steven F.