Development of Manufacturing Methods for Ballistically Tolerant Fiberglass Tubular Bellcranks
ARMY AIR MOBILITY RESEARCH AND DEVELOPMENT LAB FORT EUSTIS VA EUSTIS DIRECTORATE
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The development of manufacturing methods for a ballistically tolerant fiberglass tubular elementsandwich CH-47 forward bellcrank which would optimize production costs and weight while achieving structural repeatability, is discussed. Complete fabrication details are pre-sented. Ballistic, fatigue, and static tests, conducted at -65, 75, and 180 F, showed that the bellcrank met the design requirements. The manufacturing techniques developed resulted in both substantial weight savings 1.65 lbs compared to 3.4 lbs for a metal bellcrank and cost savings 68.00 compared to 135.00. A slotting technique that localized the ballistic damage on the exit face sheet and prevented gross delaminations was developed.