Other major design changes included the enlargement of the fuel tanks on the first stage. For the first time the rocket would carry its planned 750,000 lb (340,000 kg) of propellant and would use eight upgraded engines producing a thrust each of 188,000 lbf (836 kN). The first stage also featured for the first time eight fins for added stability during flight. As with the earlier flight the rocket would still carry only a Jupiter-C nosecone instead of a boilerplate Apollo spacecraft.