Twin-rotor helicopter with tractor propeller. All rotors powered by single 50hp Argus engine. Construction started in 1909 (St.Petersburg), aircraft was re-designed several times and never finished.
Russian Aviation Museum
Links:
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Stack trace:
#0 /data03/virt15346/domeenid/www.aviastar.org/htdocs/helicopters_eng/sorokin.php(56): mysqli_connect('mysql5.zone.ee', 'd14657sa18989', Object(SensitiveParameterValue))
#1 {main}
thrown in /data03/virt15346/domeenid/www.aviastar.org/htdocs/helicopters_eng/sorokin.php on line 56
