Helicopter project by Richard Schön.
L.Benes "Ceskoslovenske Vrtulniky", 1998
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Technical data for VK-4
Number of seats: 6, engine: 1 x M-601H rated 383kW, rotor diameter: 10.70m, length: 9.75m, height: 2.92m, gross weight: 1790kg, empty weight: 925kg, maximum speed: 240km/h, cruising speed: 162km/h, rate of climb: 9.5m/s, absolute ceiling: 5000m, hover ceiling outside of ground effect: 2500m, range: 500km