Ettore Manzolini established a company in Rome, Italy to develop a helicopter he had designed.
The design was the Manzolini Libellula an unusual co-axial helicopter.
An improved version was the single-seat Libellula II which went on to gain Italian certification on 15 October 1962.
A three-seater version (the Libellula III) was built and a four-seat Libellula IV was planned but Manzolini stopped development in the late 1960s.
Data from Jane's All The World's Aircraft 1965–66[1]General characteristics Performance