PROPELLER BLADE Russian patent published in 2004 - IPC

FIELD: aircraft propellers; fans, compressors and other items of equipment converting rotational energy to air flow. SUBSTANCE: proposed propeller blade has front and rear surfaces intersecting at acute angle near leading edge and engageable on trailing edge. Profile of blade section is formed by intersection of parabolas; blade has round-off leading edge and bend on fin tip at angle no less than 60 deg. Trailing edge is provided with stabilizing surface which is tangential relative to front surface of blade projecting at fin end above trailing edge. Leading edge of blade may be made in form of parabola for enhancing its dynamic characteristics. Coefficients of all parabola are selected from definite relationships. EFFECT: enhanced efficiency; reduced level of noise; avoidance of danger of flow break-away. 2 cl, 3 dwg