POGO
The pogo effect recurred during Apollo 13's launch and ascent; Saturn engineers at Marshall mad some mods to eliminate the problem before th eApollo 14 launch ( https://www.hq.nasa.gov/pao/History/SP-4204/ch22-7.html ).
The pogo effect recurred during Apollo 13's launch and ascent; Saturn engineers at Marshall mad some mods to eliminate the problem before th eApollo 14 launch ( https://www.hq.nasa.gov/pao/History/SP-4204/ch22-7.html ).