Encyclopedia Astronautica
1968.09.24 - Launch wind constraint for Saturn IB relaxed

Apollo Program Director Samuel C. Phillips wrote to his two principal counterparts at MSFC and MSC, Lee B. James and George M. Low, to express his concern that the launch-release wind constraint for the Saturn IB, currently 45 kilometers, was perhaps the most restrictive of all such constraints.

Phillips emphasized his need for a complete understanding of all tradeoffs associated with this figure, to allow a real-time estimate of the requirement to hold. He asked James and Low to summarize for him several such tradeoffs before the Apollo 7 flight readiness review: wind versus safety, velocity versus direction, and conservative assumption versus technical accuracy. Also, he asked for criticality and failure mode for each of the above tradeoffs to allow a technical evaluation of increasing the 45-kilometer constraint. At the same time, he asked that a similar effort be initiated for the Saturn V.

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