Design and Development of Helicopter External Cargo Sling Legs made with Kevlar
CORTLAND LINE CO NY
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Quantitive equations and graphs for torque balanced Kevlar rope constructions have been applied to the preliminary design of sling legs for heavy lift helicopters. Fifty-one 14-foot sling legs were made and tested to determine minimum break strengths for the 10,000-lb 10K, 25,000-lb 25K, and 40,000-lb 40K load capacity assemblies. Three 10K assemblies using torque balanced Kevlar rope with eye-spliced terminations over No. 2 SLIP-THRU thimbles were delivered to USAAMRDL AVSCOM for field testing. Three 25K and four 40K assemblies made by an alternative torque balanced Kevlar grommet design were also delivered for field testing. The four sling legs on each of these 10K assemblies were made using torque balanced Kevlar rope with eye-spliced terminations over No. 2 SLIP-THRU timbles. The three 25 K and four 40 K assemblies delivered for field testing were made by an alternative torque balanced Kevlar grommet design No. 3 and 4 size thimbles.