Patent ID: 7186088

Claim:
A fan comprising: a hub, a plurality of fan blades attached to the hub at one end and extending outwardly from the hub, and a ring concentric with the hub and coupled to tips of the blades, wherein a dimensionless radius (r/R) is defined from a center of the hub (r/R=0) radially outwardly, wherein each tip of the blades is r/R=1, wherein a stagger angle is defined as an angle between an axis of rotation of the fan and a set angle of each fan blade, and C/R is a dimensionless chord length where C is chord, the fan defined generally by: r/R Stagger angle C/R 0.387 56.0 0.298 0.418 56.8 0.294 0.449 57.7 0.289 0.479 59.0 0.285 0.510 60.5 0.281 0.540 62.2 0.277 0.571 63.9 0.272 0.602 65.5 0.268 0.632 67.0 0.264 0.663 68.3 0.260 0.694 69.3 0.255 0.724 70.2 0.247 0.755 70.8 0.238 0.786 71.3 0.230 0.816 71.8 0.221 0.847 72.2 0.213 0.877 72.8 0.204 0.908 73.4 0.196 0.939 74.0 0.187 0.969 74.4 0.179 1.000 74.5 0.170.