FIELD: aircraft engineering.
SUBSTANCE: air propulsor comprises main and extra upper rotors as well as main and extra lower rotors with blades secured to solid and hollow shafts. Blades of the main and extra rotors represent twin-type design and are arranged at 10-30 degrees relative to axes of shafts to vary rotor pitch. Ends of twin blades are interconnected by common ring. Propulsor drive is fitted on hollow shaft to displace thereat.
EFFECT: higher lift, ruled out fold over of blades.
1 dwg
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