| 摘要 |
<p>A propeller blade is rotatable about an axis of rotation and has a leading edge and a trailing edge. The blade has a configuration such that for any fixed point on the leading edge of the blade .gamma. has a maximum valueof 90.degree., and for any fixed point on the trailing edge .gamma. has a maximum value of Arc cotg ¢ (tg .beta.)3! wherein .gamma. is the angle between a radium extending from the axis of rotation to the fixed point and a vector from the fixed point in the direction of rotation of the blade, the vector lying in a plane which is perpendicular to the axis of rotation and which passes through the fixed point. the vector is normal to a section outline formed by the plane passing through the blade. .beta. is angle between the plane and the chord of a cylindrical profile or cross-section of the blade formed by an imaginary cylinder concentric to the axis of rotation and passing through the fixed point.</p> |
