Aerodynamic interface component for fan blade

1. A fan, the fan comprising:

(a) a hub, wherein the hub is configured to rotate, wherein the hub has a fan blade engaging region;

(b) a plurality of fan blades with first and second ends, wherein the first end of each fan blade has an edge, wherein the first end of each fan blade is configured to mount to the hub at the fan blade engaging region of the hub;

(c) an plurality of interface components, wherein each interface component is configured to mount at the first end of a corresponding fan blade of the plurality of fan blades, wherein each interface component is configured to simultaneously engage an outer surface of the hub and the first end of the fan blade, wherein each interface component is configured to substantially close a gap between the edge of the first end of the corresponding fan blade and the outer surface of the hub.

2. The fan of claim 1 , wherein the fan blade engaging region of the hub comprises a vertical outer face of the hub.

3. The fan of claim 2 , wherein each interface component is configured to simultaneously engage the vertical outer face of the hub and the first end of the fan blade.

4. The fan of claim 2 , wherein the vertical outer face of the hub is curved.

5. The fan of claim 4 , wherein each interface component has a hub-engaging edge, wherein the hub-engaging edge of each interface component is curved to complement the curved vertical outer face of the hub to provide a substantially continuous fit between the hub-engaging edge of each interface component and the curved vertical outer face of the hub.

6. The fan of claim 2 , wherein the fan blade engaging region further comprises a plurality of fan blade engaging members, wherein the fan blade engaging members of the hub extend radially outward.

7. The fan of claim 6 , wherein the fan blades are substantially hollow.

8. The fan of claim 7 , wherein each fan blade engaging member of the hub is configured to be inserted within a corresponding fan blade of the plurality of fan blades.

9. The fan of claim 8 , wherein each interface component defines an opening sized and configured to receive a corresponding fan blade engaging member of the hub.

10. The fan of claim 1 , wherein each interface component comprises at least one resilient member, wherein the at least one resilient member of each interface component is configured to resiliently bear against the first end of a corresponding fan blade.

11. The fan of claim 10 , wherein the at least one resilient member of each interface component comprises a plurality of cantilever springs.

12. The fan of claim 10 , wherein the at least one resilient member of each interface component comprises a curved integral spring.

13. The fan of claim 10 , wherein each interface component further comprises a web, wherein the at least one resilient member of each interface component is integrally formed with the web of the corresponding interface component.

14. The fan of claim 1 , wherein each interface component further comprises a sleeve, wherein the sleeve of each interface component is configured to extend along a portion of the length of a corresponding fan blade of the plurality of fan blades.

15. The fan of claim 14 , wherein each interface component further comprises a web, wherein each sleeve terminates in a corresponding web.

16. The fan of claim 1 , wherein each fan blade has an airfoil shape, wherein each interface component has an airfoil shape.

17. The fan of claim 16 , wherein the airfoil shape of each interface component complements the airfoil shape of each corresponding fan blade.

18. A fan blade interface component, comprising:

(a) a sleeve portion configured to receive a fan blade end, wherein the fan blade end has an outer surface and an edge, wherein the sleeve portion is configured to extend along a portion of the length of the outer surface of the fan blade end;

(b) a hub engaging portion, wherein the hub engaging portion is configured to substantially continuously engage a fan hub outer face and to substantially close a gap defined between the edge of the first end of the fan blade and the outer face of the hub; and

(c) at least one resilient member, wherein the at least one resilient member is configured to resiliently bear against the edge of the fan blade end to resiliently bias the hub engaging portion against the outer face of the hub.

19. The fan blade interface component of claim 18 , wherein the at least one resilient member comprises a pair of cantilever springs.

20. A method of fitting an interface component to a fan, wherein the fan comprises a hub and a plurality of fan blades, wherein the hub is configured to rotate, wherein the hub comprises a plurality of radially extending fan blade mounting members and an outer surface adjacent to the radially extending fan blade mounting members, wherein each of the fan blades has a first end and a second end, wherein the first end of each fan blade has an outer edge, wherein the first end of each fan blade is configured to engage a corresponding fan blade mounting member of the plurality of fan blade mounting members while defining a gap between the outer edge of the fan blade and the hub, wherein the interface component comprises a sleeve configured to receive the first end of a corresponding fan blade of the plurality of fan blades, wherein each interface component defines an opening configured to receive a corresponding fan blade mounting member of the plurality of fan blade mounting members, the method comprising:

(a) positioning each interface component of the plurality of interface components about a corresponding fan blade mounting member of the plurality of fan blade mounting members, wherein the act of positioning comprises passing each fan blade mounting member through the opening defined by each corresponding interface component;

(b) positioning each interface component of the plurality of interface components to engage the outer surface of the hub;

(c) inserting the first end of each fan blade into the sleeve of a corresponding interface component of the plurality of interface components, such that the outer edge of the fan blade is enclosed within the sleeve and such that the sleeve substantially closes a gap defined between the outer edge of the first end of the fan blade and the outer surface of the hub; and

(d) securing each fan blade relative to a corresponding fan blade mounting member of the plurality of fan blade mounting members, wherein the gap remains defined between the outer edge of the first end of the fan blade and the outer surface of the hub during the act of securing each fan blade relative to the corresponding fan blade mounting member, wherein the sleeve of each interface component continues to substantially close the gap during the act of securing each fan blade relative to the corresponding fan blade mounting member.