A further development of the GCA-2, serial number N6594K, first flew on April 25, 1952 piloted by Jim Ryan. Convertible to an ambulance with three litters.

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Technical data for GCA-2C Number of seats: 6-8, engine: 1 x P&W R-985 rated 450hp, rotor diameter: 14.64m, max. speed: 140km/h, cruising speed: 110km/h