Saturn Apollo Program

The launch of the SA-7 (Saturn I Block II) was on September 18, 1964. The SA-7 mission was the second orbital flight of the S-IV stage (second stage) with the payload consisting of the Apollo command and service module's instrument unit. The Saturn I Block II vehicle had two live stages, and were basically in the two-stage configuration of the Saturn I vehicle. While the tank arrangement and the engine patterns were the same, there were marked changes between the Block I and II versions. The first stage (S-I stage) was an improved version of the Block I S-I stage. The Block II S-1 stage had eight fins added for greater aerodynamic stability in the lower atmosphere.