The article discusses the decision-making process behind choosing between a conventional hydraulic system or a fueldraulic system for the S-IC stage of the Saturn V launch vehicle in 1963. Controversy surrounded this decision, with arguments for each system based on complexity, reliability, and potential leak points. Ultimately, the fueldraulic system was chosen due to cost, delivery schedules, and the perceived reliability of fewer components. Challenges included flash point hazards with RP-1, contamination concerns with the large fluid capacity, and evaluating new technologies like automatic particle counters for contamination control. The fueldraulic system presented advanced technology with promising solutions to existing problems.
https://www.powermotiontech.com/hydraulics/hydraulic-fluids/article/21887406/the-saturn-v-fueldraulic-gimbal-system