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ETA: The eta is an Open Class two-seater flapped self-launching glider manufactured by ETA Aircraft. It is the highest performing glider in existence.Three etas have been manufactured to date. The second prototype was extensively damaged in 2003 during the spin tests required for the type certification. Both pilots parachuted to safety. The prototype was repaired and the tests completed successfully.The glider will be produced by hand in a small series, at a rate of about three per year.Eta is an example of a current trend in glider development in which private pilots initiate the development of new open class gliders. Currently, the private development of the Concordia sailplane promises a further elevation of lift-drag (l/D) ratio of several points.