Manufacturing method of small propeller
A small propeller is characterized in that the propeller includes two identical blades, one of which is obtained by rotating the other blade 180 degrees around the axis of rotation, and each blade is composed of two curved surfaces on the upper surface and the lower surface. ; From the root to the tip of the blade, the upper surface is always convex from the front edge to the rear edge; from the root to the 50% radius, the lower surface is convex downward.
The relative thickness of small propeller blades gradually decreases from the rotating shaft to the tip; the maximum relative thickness is 30%, the relative thickness at 50% radius is 8.67%, the relative thickness at 60% radius is 7.07%, and the relative thickness at 70% radius is 7.07%. The relative thickness is 6.87%, the relative thickness at 80% radius is 6.04%, the relative thickness at 90% radius is 4.55%, and the relative thickness of the propeller tip is 2.07%. From the root to the tip, the relative thickness and the profile torsion angle gradually decrease, and the profile chord first increases and then decreases.
The trailing edge of the small propeller blade has a relative thickness, and the relative thickness gradually decreases from the 50% radius to the tip. It is characterized in that, from the radius of 50% to the tip of the blade, the curved surface of the lower surface presents a downward convex shape at 10% of the chord length of the leading edge, from 10% of the chord length to the trailing edge is concave, and the degree of concave is from 50% The radius gradually increases to the tip of the blade; the chord length of the blade gradually increases from the axis of rotation to 50% radius; from the radius of 50% to the tip, the chord length gradually decreases; the maximum chord length is at 50% radius, the chord The length is 15% of the radius, the smallest chord length is at the tip of the propeller, and the chord length is 6% of the radius. The torsion angle of the blade profile gradually decreases from the root to the tip. The torsion angle of the root is 40°, the torsion angle at the 50% radius is 22.5°, and the torsion angle of the tip is 11°.
