The Aer Lualdi L.55 was a prototype Italian helicopter, a development of the Lualdi-Tassotti ES 53 featuring a far more powerful 134 kW (180 hp) Lycoming O-360.
While the ES 53 had been purely experimental, the L.55 was Lualdi's first step towards a marketable aircraft.
Data from Jane's All the World's Aircraft 1958-59[1]General characteristics Performance
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