FIELD: power ventilation sets of vertical take-off and landing flying vehicles. SUBSTANCE: lift- thrust fan has blades mounted in aerodynamic ring and secured in central bush; aerodynamic ring has circular recess in plane of rotation of blades; this recess is smoothly engageable with inner surface of ring; ends of blades are received by recess and their end and upper surfaces are congruent respectively to end and upper surfaces of recess. EFFECT: enhanced reliability. 1 dwg
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