In pre-war years Aeronautica Industrial SA (AISA) was involved in work on certain early Cierva-type autogyros. In 1953, AISA produced designs for the experimental IH-51 ultra-light helicopter with tip-mounted pulse jet propulsion, and the H-52 which was of conventional layout but featured a single-blade main rotor. Neither design was built, but, in 1974, the company started construction of the prototype AISA-GN, which was an all- metal four-seat autogyro with a small stub wing, three-blade main rotor, twin booms and a fixed tricycle undercarriage. After prolonged development, the prototype was flown on 20 July 1982, powered by a 225kW Lycoming IO-540-K-1A5 engine. The prototype was damaged in September 1982, and the project was then abandoned.

Technical data for AISA GN Engine: 1 x Lycoming rated at 225kW, main rotor diameter: 12.80m, fuselage length: 6.50m, height: 3.20m, wingspan: 2.60m, take-off weight: 1200kg, empty weight: 708kg, max speed: 240km/h, range: 800km

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