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English: Slingsby Aviation is a British aircraft company based in Kirkbymoorside, North Yorkshire, England. The Slingsby business was founded on the building and design of gliders and sailplanes. From the early 1930s to about 1970 it built over 50% of all British club gliders and had success at national and international level competitions. It then produced some powered aircraft, notably the composite built Firefly trainer, before becoming a producer of specialised composite materials and components.