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Патент USA US3080595

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....... BL E
Patented Mar. 12, 1963
Referring now more particularly to the drawings, the
ski is indicated generally by the numeral 10 and con
sists of a ski-shaped piece of ?oatable ‘material such as
Filed Nov. 7, 1960, Ser. No. 67,596
2 Claims. (Cl. 9--310)
portion 11. It will be appreciated that in practice suit
l’aul A. Marble, 16 W. Pedregosa, Santa Barbara, Calif.
wood or laminated wood having an upwardly bent toe
able ‘bindings will be required for the feet of the user, but
as the same constitute no part of the present invention
This invention relates to a water ski having a unique
cross-sectional con?guration by which is achieved a ski
they have been omitted. As indicated at the position of
the root of the bend for the toe portion 11 the bottom of
having less drag and one which lies in a much ?atter plan
ing position rather than the customary bow up, stern 10 the ski is ?at as shown in FIGURE 3 at 12, but as is shown
in FIGURES 4, 5, 6 and 7, directly behind the bend 3
down plowing condition presented by conventional skis
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.
more, the unique con?guration of the ski provides greater 15 A convenient method of forming a ski in this manner is
by curving an initially ?at ski with the result that the cross
‘buoyancy or lift so that the ski may be used at very low
section of the ski in any of the sections 4, 5 or 6 will show
speeds enabling the use of boats with much lesser horse
when used one at a time only. The con?guration of this
ski has also been found to render the same more stable
and yet to respond readily on cuts and turns. Further
power power plants. In fact, a ski embodying the present
invention has been successfully skied as a single ski sup
the same as concave-convex.
While there has been described what is at present con
sidered a preferred embodiment of the present invention,
it will be appreciated by those skilled in the art that
various changes and modi?cations can be made therein
without departing from the essence of the invention and
porting 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
it is intended to cover herein all such changes and modi
invention that a water ski is provided which is conven
tional construction near the upwardly bent toe, but has a 25 ?cations as come Within the true spirit and scope of the
appended claims.
concave bottom with a progressively increasing degree of
I claim:
concavity, or in other words, a progressively decreasing
1. A water ski having a bottom con?guration which is
radius of curvature in the bottom from front to rear. This
?at adjacent the front of the ski in the region behind the
construction results in ‘an ever-increasing degree of lift
up-bent toe and which is concave thereafter with a pro
in the ski from bow to stern which accounts for the ?at
planing position which also smooths out rough water
gressively greater degree of curvature progressing from
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
front ‘to rear of the ski.
2. A water ski having an upbent toe and a conventional
cross-sectional con?guration adjacent the root of the bend
of attack when the ski is tilted sideways ‘as on a turn which 35 but being transversely concave-convex with a progres
eliminates side slip.
These and other objects, features and advantages will
sively greater degree of curvature from the root of the
bend to the rear of the ski.
be apparent from the ‘annexed speci?cation 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, 5 and 6 are sections taken along the
References Cited in the ?le of this patent
Broome _____________ __ Dec. 26, 1939
lines 3--3, 4--4, 5—5 and 6—6, respectively; and
Van Gorden _________ __ Mar. 19, 1940
FIGURE 7 is an end view taken along the line 7-7
of FIGURE 2.
Wilbrich ____________ __ Jan. 13, 1942
Leung ______________ __ Nov. 15, 1960
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