US 3080585 A
Abstract available in
Claims available in
Description (OCR text may contain errors)
INVENTOR. PAUL A -MAHELE ATTORNEYS Unite 3,080,585 WATER SKI laul A. Marble, 16 W. Pedregosa, Santa Barbara, Calif. Filed Nov. 7, 1960, Ser. No. 67,596 2 Claims. (Cl. 9--310) This invention relates to a water ski having a unique cross-sectional configuration by which is achieved a ski having less drag and one which lies in a much flatter planing position rather than the customary bow up, stern down plowing condition presented by conventional skis when used one at a time only. The configuration of this ski has also been found to render the same more stable and yet to respond readily on cuts and turns. Furthermore, the unique configuration of the ski provides greater buoyancy or lift so that the ski may be used at very low speeds enabling the use of boats with much lesser horsepower power plants. In fact, a ski embodying the present invention has been successfully skied as a single ski supporting a one hundred and sixty pound skier at twelve miles per hour.
The increased lift also, of course, provides easier and quicker starts from deep water. It is a feature of this invention that a water ski is provided which is conventional construction near the upwardly bent toe, but has a concave bottom with a progressively increasing degree of concavity, or in other words, a progressively decreasing radius of curvature in the bottom from front to rear. This construction results in an ever-increasing degree of lift in the ski from bow to stern which accounts for the flat planing position which also smooths out rough water rather than merely bouncing over the same.
It is another feature of this invention that the concavity in the bottom of the ski presents a greater degree of angle of attack when the ski is tilted sideways as on a turn which eliminates side slip.
These and other objects, features and advantages will be apparent from the annexed specification in which:
'FIGURE 1 is atop plan view of the ski embodying the present invention;
FIGURE 2 is a side view thereof;
FIGURES 3, 4, and 6 are sections taken along the lines 3--3, 4--4, 55 and 66, respectively; and
FIGURE 7 is an end view taken along the line 7-7 of FIGURE 2.
Patented Mar. 12, 1963 Referring now more particularly to the drawings, the ski is indicated generally by the numeral 10 and consists of a ski-shaped piece of floatable material such as wood or laminated wood having an upwardly bent toe portion 11. It will be appreciated that in practice suitable bindings will be required for the feet of the user, but as the same constitute no part of the present invention they have been omitted. As indicated at the position of the root of the bend for the toe portion 11 the bottom of the ski is fiat as shown in FIGURE 3 at 12, but as is shown in FIGURES 4, 5, 6 and 7, directly behind the bend 3 the bottom of the ski 13 is concave in cross-section with the degree of concavity increasing as at 14 and again at 15 and being maximum at the rear end as at 16, as shown. A convenient method of forming a ski in this manner is by curving an initially flat ski with the result that the crosssection of the ski in any of the sections 4, 5 or 6 will show the same as concave-convex.
While there has been described what is at present considered a preferred embodiment of the present invention, it will be appreciated by those skilled in the art that various changes and modifications can be made therein without departing from the essence of the invention and it is intended to cover herein all such changes and modifications as come Within the true spirit and scope of the appended claims.
1. A water ski having a bottom configuration which is flat adjacent the front of the ski in the region behind the up-bent toe and which is concave thereafter with a progressively greater degree of curvature progressing from front to rear of the ski.
2. A water ski having an upbent toe and a conventional cross-sectional configuration adjacent the root of the bend but being transversely concave-convex with a progressively greater degree of curvature from the root of the bend to the rear of the ski.
References Cited in the file of this patent UNITED STATES PATENTS 2,184,791 Broome Dec. 26, 1939 2,193,892 Van Gorden Mar. 19, 1940 2,269,801 Wilbrich Jan. 13, 1942 2,959,795 Leung Nov. 15, 1960