Helicopter project of 1968.
L.Benes "Ceskoslovenske Vrtulniky", 1998
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Technical data for HC-4
Number of seats: 6, engine: 1 x M-601H rated 405kW, rotor diameter: 10.60m, length: 12.60m, height: 3.05m, gross weight: 1867-2000kg, empty weight: 1077kg, maximum speed: 240km/h, cruising speed: 200km/h, rate of climb: 10.0m/s, absolute ceiling: 5000m, range with normal weight and 200km/h: 400km, range with normal weight and 160km/h: 500km, maximum range: 700km