Claims

1) A water skiing disk comprising:first and second disk surfaces are opposite sides of the disk, the first and second disk surfaces with a diameter of from 40 to 50 inches and having a circular outer edge with a center axis that defines mutually perpendicular axial and radial directions relative to the disk, the first and second disk surfaces having no obstructions on the surfaces;the disk having an axial thickness between the first and second disk surfaces at the center axis of from 1 inch to 2 inches;the first disk surface having circular center section that extends radially outwardly from the center axis to a radius of 18 inches to 22 inches, the center section being substantially flat;the first disk surface having annular intermediate section that extends radially outwardly from the center section to a radius of from 2 inches to 6 inches from the center section, the intermediate section having a large radius of curvature; and,the first disk surface having annular outer section that extends radially outwardly from the intermediate section to the outer edge, the outer section having a small radius of curvature that is smaller than the large radius of curvature.

2) The disk of claim 1, further comprising:the large radius of curvature being from 225 inches to 325 inches; and, the small radius of curvature being from 0.35 of an inch to 0.40 of an inch.

3) The disk of claim 1, further comprising:the circular center section of the first disk surface extending radially outwardly from the center axis to a radius of substantially 19 inches;the annular intermediate section of the first disk surface extending radially outwardly from the center section to a radius of substantially 4 inches from the center section; and,the annular outer section of the first disk surface extending radially outwardly from the intermediate section to a radius of substantially 1 inch from the intermediate section.

4) The disk of claim 3, further comprising:the axial thickness of the disk at the center axis being substantially 1 inch.

5) The disk of claim 1, further comprising:the first and second disk surfaces being on a plastic outer shell with a hollow interior; and,a hardened foam filling the hollow interior.

6) The disk of claim 5, further comprising:the foam completely filling the hollow interior of the outer shell.

7) A water skiing disk comprising:first and second disk surfaces on opposite sides of the disk, the first and second disk surfaces having a diameter dimension of substantially 47 inches and a circular outer edge with a center axis that defines mutually perpendicular axial and radial directions relative to the disk, the first and second disk surfaces having substantially convex configurations, the first disk surface having a circular center section that extends radially outwardly from the center axis to a radius of substantially 19.5 inches and being substantially flat, the first disk surface having an annular intermediate section that extends radially outwardly from the center section to a radius of substantially 4.0 inches from the center section and having a radius of curvature of substantially 275.4 inches, and the first disk surface having an annular outer section that extends radially outwardly from the intermediate section to the outer edge and having a radius of curvature of substantially 0.375 of an inch.

8) The disk of claim 7, further comprising:the second disk surface extending radially outwardly from the center axis to the outer edge and having a radius curvature of substantially 552 inches.

9) The disk of claim 7, further comprising:the first and second disk surfaces being continuous surfaces within the outer edge with there being no obstructions on the first and second disk surfaces within the outer edge.

10) The disk of claim 7, further comprising:the first and second disk surfaces being continuous convex surfaces within the outer edge with there being no hole through the disk within the outer edge.

11) The disk of claim 7, further comprising:the disk weighing less than 30 pounds.

12) The disk of claim 7, further comprising:the disk weighing substantially 24 pounds.

13) The disk of claim 7, further comprising:a hollow plastic outer shell with the first and second disk surfaces being on opposite sides of the shell.

14) The disk of claim 13, further comprising:a hardened foam filling the shell.

15) A water skiing disk comprising:an outer plastic hollow shell having opposite first and second disk surfaces and a circular outer peripheral edge around the first and second surfaces, the circular outer peripheral edge having a diameter dimension of 47 inches, the second disk surface having a convex configuration with a radius of curvature of from 500 inches to 600 inches, the first disk surface having a circular center section that is flat, the first disk surface having an annular intermediate section that extends around the center section and has a radius of curvature of from 250 inches to 300 inches, and the first disk surface having an annular outer section that extends around the intermediate section and extends to the outer peripheral edge and has a radius of curvature from 0.35 inches to 0.40 inches.

16) The disk of claim 15, further comprising:the radius of curvature of the second disk surface being substantially 552 inches, the radius of curvature of the first disk surface intermediate section being 275.4 inches, and the radius of curvature of the first disk surface outer section being 0.375 of an inch.

17) The disk of claim 15, further comprising:the first and second disk surfaces being continuous surfaces within the outer edge with there being no obstructions on the first and second disk surfaces within the outer edge.

18) The disk of claim 15, further comprising:the first and second disk surfaces being continuous surfaces within the outer edge with there being no hole through the disk within the outer edge.

19) The disk of claim 15, further comprising:the disk weighing less than 30 pounds.

20) The disk of claim 15, further comprising:a hollow plastic outer shell with the first and second disk surfaces being on opposite sides of the shell.

21) The disk of claim 20, further comprising:a hardened foam filling the shell.