MARINE CASE STUDY UL TRA DYNAMICS Ultra Dynamics are a manufacturer of marine jet engines for the private and military sector . Crane Services were asked to attend to an urgent problem at their assembly and production plant in Cheltenham. Their 5 metre radius 2 Tonne swing jib was extremely stiff to push around, due to age, wear and ingress of moisture in the top bearing. It had become a two man operation to slew the jib, with little or

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