| 摘要 |
FIELD: aviation. ^ SUBSTANCE: aerodynamic surface of proposed blade is symmetrical relative to longitudinal plane. Upper main part of blade and lower part are articulated together for relative motion at control of lifting and pushing force of helicopter. Lower part is provided with lugs for articulation joint with upper part. Aperture angle between upper and lower parts of blade ranges from 5 to 170 deg. ^ EFFECT: enhanced efficiency. ^ 3 cl, 1 dwg
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