This report presents the results of a trial program to evaluate a mechanical strain recorder (the Prewitt Scratch Strain Gage, commonly called the Scratch gage) for future fatigue monitoring on individual C-130 aircraft. A C-130E aircraft at Langley AFB was instrumented with eight electrical and four scratch strain gages. Comparisons of stresses from the scratch and electrical gases indicate that the scratch gage, particularly the 10- and 12-inch gages, accurately ...
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