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By R. S. Ryan

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At this early phase in the rockets and space age, models did not exist for analyzing problems of this type. As a result, several things happened. Propellant sloshing data had to be obtained quickly. No analytical solutions were readily available. A test program was started that included both scale-model and full-scale testing. A slosh suppresser had to be found before the next launch. In order to meet this goal, a full-size propellant tank filled with water was placed on a railroad car. The railroad car was bumped against the track end stop as an excitation source.

The fix was fairly easy and did not impact flight schedules drastically. This is not always the case, and repeats of this type instability should be avoided if possible. The innovative way special tests were conceived and conducted to meet launch schedules should be a lesson in this age of precise testing. 23 Figure 17. Beer cans, Jupiter anti-slosh devices. Figure 18. Slosh baffles, Jupiter missile. 24 B. 23 Being a family, it provided a building-block approach that led to the successful Moon landing and the Skylab space station program.

This was solved through the use of a dynamic damper between the vehicle and the launch pad service tower, which had a disconnect for launch. This led to a wind constraint for launch in order to not have vortex shedding during the short time the damper was disconnected. One very innovative technique used to understand the vehicle structural dynamics characteristics while on the mobile launch platform (MLP) was the so-called tennis shoe test. The full-scale assembly of the mated test vehicle was assembled on the MLP in the vertical assembly building.

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