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Патент USA US3089167

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May 14, 1963
G. H. MAY
-
3,089,157
' FIN FOR WATER SKIS
Filed Aug. 11. 1960
16/
_
FIG.2
15
_ '
FIG.3
INVENTOR.
GORDON H. MAY
United States Patent @ffiee
1
assess’;
Fifi FUR WAT R SKIS
Gordon H. May, 1923 tiarnden Ave, San lose, Calif.
Filed Aug. it, was, Ser- No. sasss
3 Claims. (til. 9-616)
Patented May 14», 19%3
2
tapered leading edge, greatly reduces the safety hazard
to swimmers or fallen skiers in case of accident.
The web of the present invention is illustrated as
U-shaped, but other unobstructed concave shapes, such a
V, semicircle, etc., may be used if desired. While the
present ?n has been illustrated with a slalom (single) ski
it is equally applicable to double skis, and may be used
The present invention relates to a ?n for a water ski
with other similar surface-riding craft, such as surfboards,
and more particularly to a ?n for stabilizing a water ski
etc.
in a plurality of directions.
Obviously many modi?cations and variations of the
The commonly used slalom Water ski has a knife-like 10
present invention are possible in light of the above teach
?n which extends up to 41/2 inches below the lower sur
ings. It is therefore to be understood that within the
face of the ski. This type ?n stabilizes the ski in a lateral
scope of the appended claims, the invention may be prac
direction for steering under smooth skiing conditions.
However, in rough water the ski may bounce and pull the
?n out of the water, thus leaving the ski with no steering
purchase in the water. This type ?n also offers somewhat
ticed otherwise than as speci?cally described.
What is claimed as my invention is:
of a hazard to swimmers or fallen skiers because of its
lateral stabilization of a water ski, the ?n comprising an
deep, knife-like silhouette.
The object of the present invention is the provision
l. A stabilizing ?n for providing both vertical and
elongated hollow member adapted to be aligned with the
longitudinal axis of the ski the member including thin
of ?n which provides both lateral and vertical stability 20 ?at mounting means, means for providing lateral stability
for a water ski with a minimum depth silhouette.
In the present invention a hollow, generally U-shaped
?n is provided for attachment along the lower centerline
of a water ski.
A continuous flow of water courses
including a pair of elongated spaced generally parallel
side sections joined to the fin mounting means along lon
gitudinal edges thereof and depending therefrom and
means for providing vertical stability including an arm
through the hollow interior of the ?n and resists both 25 ate section joined to both side sections along longitudinal
edges thereof spaced from and parallel to the mounting
vertical and lateral movement of the ski while providing
means, the arcuate section and the side sections de?ning
excellent steering properties for the ski.
a straight unobstructed channel throughout the length of
Other objects and many of the attendant advantages of
the ?n permitting a constant ?ow of water parallel to the
this invention will be readily appreciated as the same
becomes better understood by reference to the following 30 longitudinal axis of the ski.
2. A stabilizing ?n for providing both vertical and
detailed description when considered in connection with
lateral stabilization of a water ski, the ?n comprising an
the accompanying drawings, wherein:
elongated hollow member adapted to be aligned with the
FIG. 1 is a perspective view of a water ski incorporat
center line of the ski, the member including:
ing the ?n of the present invention;
35
thin ?at mounting means adapted to be received ?ush
FIG. 2 is an elevation view of the present ?n; and
against the lower surface of the ski;
FIG. 3 is an end view of the ?n of FIG. 2.
means for providing lateral stability including a pair
The ?n 10 of the present invention is illustrated in FIG.
of thin elongated planar side sections positioned gen
1 in operating position on the lower, rear centerline of a
erally parallel to each other and spaced at short dis
conventional slalom water ski. An unobstructed channel
40
tance apart, each side section having one longitudinal
11 through the interior of the ?n is shown as aligned with
edge secured to the mounting means and extending
the longitudinal axis of the ski to permit the flow of water
approximately normal thereto to resist lateral dis
through the ?n as the ski rides along the surface of the
water.
Referring to FIGS. 2 and 3, the ?n of the present inven
tion has an elongated web section 12 which is generally
U-shaped in cross-section. The lateral edges of the web
are bent outwardly in opposite directions approximately
placement of the ski; and
means for providing vertical stability including a deeply
curved section joining the remaining longitudinal
edges of the side sections, the curved section and the
side sections forming ‘a straight unobstructed channel
throughout the length of the ?n permitting a con
normal to the Web to de?ne thin ?anges 13 and 14. The
stant ?ow of Water parallel to the longitudinal axis
leading edge 15 of the web is tapered rearwardly away 50
of the ski and resisting vertical displacement of the
from the ?anges for streamlining elfect, while the trailing
ski.
edge 16 of the web may be perpendicular to the ?anges.
3. A stabilizing ?n for a water ski, comprising: thin
Spaced openings 17 are provided along the length of each
flat mounting means;
?ange to permit attachment of the ?n to a ski by any suit
planar means for providing lateral stabilization con
able securing means, such as screws, bolts, etc. The web
nected to the mounting means; and
comprises thin parallel side sections which provided
lateral stability and an arcuate section joining the. lower
ends of the side sections and providing for vertical sta
bility.
The flow of water through the channel de?ned by the 60
web of the present ?n and the lower surface of the attached
ski provides both vertical and lateral stability for the ski.
The ?n holds the ski in contact with the surface of the
water and resists upward movement to the rear of the ski, 65
so that the ski is under the control of the skier at all times.
The ?ow of water through the channel in the ?n not only
holds the ski vertically, but also provides excellent steer
ing properties for the ski, even though the depth of the
present ?n in only approximately half that of the conven 70
tional slalom ski ?n. The low silhouette makes for con
venient storage and carrying of the ski, and with the
arcuate means for providing vertical stabilization con
nected to the planar means and removed from the
mounting means.
the planar means and the arcuate means combining
to form a straight channel extending the length of
the ?n for conducting an unobstructed flow of Water
parallel to the longitudinal axis of a ski.
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,462,450
2,940,091
3,025,539
Wilson ______________ __ Feb. 22, 1949
Fifer ________________ __ June 14, 1960
Kincaid _____________ __ Mar. 20, 1962
6,574
Great Britain ________________ __ 1888
544,239
Great Britain ________ __ Apr. 2, 1942
FOREIGN PATENTS
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