Seventy-five years ago, on 17 January 1923, the first successful flight of a rotary wing aircraft took place. The first gyroplane, patented as Autogiro, was invented by Juan de la Cierva Codorniú. For this reason, the Juan de la Cierva Foundation in Spain has promoted a project to build a replica, authorized to fly, of the Cierva's C-30, the most famous of his Autogiros. It is planned to fly the replica only in exhibitions. In this paper an historical review of the works of Juan de la Cierva is presented and the C-30 restoration is illustrated and described.
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