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Патент USA US3078829

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Feb. 26, 1963
Filed May 27, 1960
2 Sheets-Sheet 1
Feb. 26, 1963
Filed May 27, 1960
FIG. 3
2 Sheets7-Sheet 2
United States Patent nice
Howard Kiss, 328 Bedell St., Freeport, NY.
Filed May 27, 1960, Ser. No. 32,298
1 Claim. (Cl. 114-—61)
This invention relates to hull construction for boats
and primarily for small pleasure craft and relates more
particularly to the design of the submersible portion of a
Patented Feb. 26, 1963
concave surfaces 20 whose upper edges 21 curve down
wardly toward the lower longitudinal edges 22 of the
In the instance shown the receding concave sur
face 20 extends rearwardly about one-third the length
of the craft and terminates at a point 24 along said low
er longitudinal edges. This relationship, however, may
vary considerably, depending upon the use to which the
craft is to be put.
The bottom of the hull is substantially flat as shown
craft to give it a more e?icient con?guration to give it 10 at 26 and there is formed a central longitudinal channel
faster speeds by greatly reducing its resistance to forward
or trough extending from the stem to the bow and is de
travel over existing designs.
?ned as is shown by the rear elevation of the craft by
An important object of the invention is to provide an
a horizontal wall 29 and opposed vertical walls 30.
improved hull construction having a central concave lon
The channel is thus generally rectangular in cross sec
gitudinal channel of generally rectangular shape in cross 15 tion throughout the major portion of its length and only
section which reduces waves, wake and water friction
without, however, producing a con?guration which in
appearance departs noticeably from conventional craft.
at the bow do the vertical surfaces 30 and the horizontal
surface merge into opposed curved surfaces 31 as shown
in FIG. 4.
Another object of the invention is to provide a boat
This channel is so proportioned relative to the balance .
construction which has many of the advantages, including 20 of the craft that when the craft is carrying its normal
that of increased stability and safety, of a catamaran type
load, horizontal Wall 29 is just above the water line,
thereby reducing the amount of surface which contacts
without, however, presenting its ungainly and decidedly
unpopular appearance.
the water. In the preferred form of the invention the
Another object of the invention is to provide a bottom
construction of boat hull which permits the use of a
width of the channel is about equal to the width of each
of the two ?at bottom sections 26 and if the load car
propeller shaft which remains horizontal at all speeds,
ried by the boat is equally distributed from fore to aft
thus producing more e?icient operation. A ‘boat must
the boat will ride substantially level at all times and re
usually attain a speed of from one-half to two-thirds of
gardless of speed. In actual practice, however, it has
its total speed in order to plane or get up on top of the
been found that the bow of the boat has a tendency to re
water, while the hull of the present invention is on top 30 main ever so slightly higher than the stern which ac
of the water at all times and since it is a level riding hull
counts for the provision of the opposed curved surface
it does not need to raise its prow in order to plane.
31 at the bow which does not materially reduce the cross
sectional contour of the longitudinal trough while giving
The boat of the present invention remains substantially
horizontal at all speeds and the upper wall of the central
the craft an appearance more nearly like conventional
channel remains just above the water line at all times, 35 boats.
thus forming in effect an air channel which is of a width
There is also formed a smaller channel or trough 32
equal to about one-third the total width of the hull. The
on each side of the ?at bottom section 26 adjacent to but
hull may further be formed with smaller channels ex
spaced from opposed sides 11, The channel which may
tending longitudinally on each side of the generally flat
be semi-circular in transverse section extends the full
length of the craft.
bottom section near the sides of the boat.
The resulting hull has the stability of a ?at bottomed
The keel 34 extends downwardly in an area inside the
craft without its accompanying drag. The craft has most
center of each ?at bottom section '26. This keel is of
generally rectangular contour at its point of greatest
of the appearance of a conventional hull and the central
air channel is hardly noticeable, either from the front
or from the rear when the craft is moving.
width, i.e., at the point where section 5-5 is taken, and
45 it is tapered inwardly at its rear section 36 and is also
In the drawings:
tapered inwardly as it approaches its forward end 37
which is located approximately at point 24. It will ‘be
noted in FIG. 1 that this forward section of the keel also
of the usual pleasure craft.
slopes upwardly at 33. Each keel also supports a shaft
FIG. 2 is a bottom plan view thereof.
50 for the propeller 40. The shaft is shown as being driven
by an inclined shaft 41 from the engine 42. A rudder
FIG. 3 is a view of the stern or rear elevation of the
is shown at 44.
craft of FIG. 1.
The hull of the present invention is also suitable for
FIG. 4 is a view looking at the forward end of a prow
of the craft of FIG. 1.
use with an outboard craft and this arrangement is shown
"BIG. 1 is a side elevation of an embodiment of the
invention in the symmetrical hull of a ‘boat of the size
FIG. 5 is a transverse section taken on line 5-5 of 55 in FIG. 6 which is a broken rear elevation of the hull
FIG. 1.
FIG. 6 is a broken rear elevation of a craft of the pres
with its square stern 46, its generally vertical sides 48
and its central longitudinal channel 45 and narrower chan
ent invention modi?ed to provide propulsion by outboard
nels 4-9 on the ?at bottom section 51.
motors are shown at 52.
The hull of the craft is indicated at 10 and it is formed
with sides 11 which are vertical or substantially so, and
a vertical stern 12 which has a generally rectangular con
tour. The sides 11 are substantially parallel over the
Twin outboard
While there have been described herein what are at
present considered preferred embodiments of the inven
tion, it will be obvious to those skilled in the art that
many modi?cations and changes may be made therein
without departing from the essence of the invention. It is
major portion of the length of the craft. The forward
sections of the opposed sides of the craft are rounded as 65 therefore to be understood that the exemplary embodi
ments are illustrative and not restrictive of the invention,
shown at 1-4 and below the upper edges of this curved
the scope of which is de?ned in the appended claim, and
section the surfaces are inclined inwardly as shown at
that all modi?cations that come within the meaning and
15 in FIG. 2. The prow 16 has a downwardly extending
range of equivalency of the claim are intended to be in
receding convex portion shown at 18 and is of minimum 0 cluded therein.
What I claim is:
On each side of the prow the hull may have receding
In a boat construction, a hull of generally rectangular
the hull being so proportioned that the upper wall of
shape in transverse section and having a pointed bow
formed by surfaces which are slightly inwardly and down
the channel is normally above and‘ in close proximity
wardly inclined, the opposed-sides of the hull being sub
to the water line.
stantially vertical and the bottom being ?at and having a
central channel extending upwardly from said bottorn, said
channel being rectangular in‘ transverse section and being
of a width about two times its depth and dividing the lower
portion of‘ the hull into two generally‘?at, symmetrical
sections and extending. from the stern to the bow and
whose forwardlend is de?ned by sections‘vvhi‘ch are curved
upwardly'and inwardly and‘ form continuationsof the op
posed- sides of the- channel and leading upwardly to a
prow, the width‘ of said symmetrical sections being sub
References Cited‘ in‘ the ?le of this patent
D. 160,027
Smith ______________ .._ Sept. 5, 1950
Montgomery __________ __ Mar. 1, 1859
Macpherson "a _______ .. June 25, 1872
Manker ____________ __ June 28; 1904
Frampton ____________ __>Mar.‘ I4, 1911
stantially the‘ same as the width of the channel, and down
Dubay ______________ __ June 9, 1942
Garment‘ ____________ __ Nov. 15, 1949
wardly extending. keels on‘ each of said latter'sections, 15
Babcock ____________ __ Jan. 19, 1954
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