Aer Lualdi L.57
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The Aer Lualdi L.57 was a prototype Italian helicopter, a further refinement of Lualdi's ES 53 and L.55 designs.
The aircraft featured a larger main rotor than its predecessors, a fibreglass tail rotor, and an autopilot. The Aircraft could accommodate 4 people and was powered by a Lycoming-O360 A1A. Only one L.57 was ever built and the aircraft was never put into production.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
References
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