Abstract
The four aerodynamic fins, which are located close to the F-1 engines on the S-IC stage of the Saturn V vehicle, will be subjected to very high noise levels during both launch and flight. High-level acoustic energy is recognized as a potential cause of structural failure; hence, acoustic qualification tests were carried out on four fin specimens in a progressive wave chamber. Under identical test conditions (163 dB for 20 min), two of the specimens failed while two survived with no fatigue cracks detectable. This difference between the test results is attributed to the use of a thin layer of fiber glass tape in the construction of the two fins that did not fail. This tape was primarily used to separate the dissimilar metals of the ribs and skin. This paper describes the tests and presents data which show the reduction in strain levels produced by this thin layer of tape. [This work has been supported by the National Aeronautics and Space Administration.]
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