U.S. patent number 3,678,874 [Application Number 05/046,231] was granted by the patent office on 1972-07-25 for convertible boat.
Invention is credited to John W. Flink.
United States Patent |
3,678,874 |
Flink |
July 25, 1972 |
CONVERTIBLE BOAT
Abstract
This invention relates to a boat hull provided with improved
flap or vane means at the stern portion of the hull for use in
converting the hull in an expeditious and simplified fashion from
one type of boat hull to another type of boat hull, such as a
sailboat hull to a hydroplane hull and vice versa.
Inventors: |
Flink; John W. (San Jose,
CA) |
Family
ID: |
21942315 |
Appl.
No.: |
05/046,231 |
Filed: |
June 15, 1970 |
Current U.S.
Class: |
114/285 |
Current CPC
Class: |
B63B
1/22 (20130101); B63B 39/061 (20130101) |
Current International
Class: |
B63B
39/00 (20060101); B63B 39/06 (20060101); B63B
1/22 (20060101); B63B 1/16 (20060101); B63b
001/28 () |
Field of
Search: |
;114/66.5P |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Farrell; Andrew H.
Claims
What is claimed is:
1. A convertible boat hull provided with a keel center line and
chine line side portions which normally recede upwardly and away
from the keel centerline at the stern of the hull, means for
effecting a simulated projection of said chine side portions
downwardly toward the keel center line whereby the hull can be
transformed into a hydroplane type hull in the area of the stern,
said means comprising a plurality of flap devices, each said flap
device being pivotally connected to a selected part of the hull
bottom in the area of the stern, said flap devices extending in one
direction substantially fully across the boat from chine line to
chine line and in another direction rearwardly toward the boat
transom, and means for mounting and holding each said flap device
in selected extended and retracted positions, said flap devices
being located at an angle to each other and one said flap device
being provided with a metal plate to overlap an adjacent flap
device and maintain a closed surface.
2. The boat hull of claim 1 wherein said flap device is connected
to the bottom of the hull in the area of the hull where the chine
lines normally recede upwardly away from the keel.
3. The boat hull of claim 1 wherein the transom is a reverse
sloping transom.
4. The boat hull of claim 1 wherein said flap device holding means
comprise at least one control rod hingedly affixed at one extremity
to each flap device and resting against and removably and
selectively locked to a reverse sloping transom.
5. The hull of claim 1 wherein said means effecting a simulated
projection of said chine side portions comprises a pair of
flaps.
6. In a boat hull having a keel center line, a bottom, a floor, two
sides and a chine line at each side slanting upwardly to the stern
to enable free flow of water in sailing, the improvement comprising
in combination a pair of flaps hinged to said bottom, each said
flap being hingedly attached at its forward edge so that the
juncture thereof with said chine line and with said keel center
line are at substantially the same level with respect to a
horizontal plane through the center line of said floor where said
chine line begins to slant upwardly, and means to lower said flap
to form an angle with said chine line to effect planing when said
boat is in motion in water and to raise said flap to lie adjacent
said bottom, one said flap being provided with a metal plate to
overlap another said flap and maintain a closed surface when said
flaps are lowered.
7. A convertible boat hull comprising in combination:
a. a hull having a stern, a bottom, a keel center line, a transom,
two sides, a floor, and a chine line at each side slanting upwardly
at said stern;
b. a pair of flaps hingedly attached to said bottom, each said flap
extending from said keel center line to a chine line, and being
attached so that the junctures thereof with said chine lines and
with said keel center line are at substantially the same level with
relation to a horizontal plane through the center line of said
floor where said chine lines begin to slant upwardly; and
c. means to raise said flaps to lie adjacent said bottom to
facilitate efficient operation as a sailboat and to lower said
flaps to form an angle with said chine lines to effect planing when
said hull is motor-driven, one said flap being provided with a
metal plate to overlap the other said flap and to maintain a closed
surface when said flaps are lowered.
Description
BACKGROUND OF THE INVENTION
Heretofore various vane devices have been proposed for attachment
to boat hulls, such as the vanes or flaps affixed to hydroplane
hulls for use in bringing the hull to a full planing position or as
trim tabs for correcting the listing and/or improving the planing
action of a boat hull as it moves through water. These devices,
however, have ordinarily taken the form of small individual tabs or
vanes which did not extend entirely across the beam of the boat.
They are ineffective in converting a single hull of one
configuration to another hull. They lacked the overall continuity
and expanse of the flap of the instant invention which presents a
sufficient amount of surface area to the water so as to be truly
effective in breaking the suction of the water on the stern portion
of a sailing hull and in elevating it to the desired planing
position. In addition, the small sizes and locations of these prior
art flaps meant that they had to be constantly attended to in order
to keep the hull properly trimmed at all times. All of this
detracted from the recreational pruposes and designs of hulls
equipped with such flaps. Finally, these prior specially designed
hulls were also usually of complex and expensive structure and
meant that a person desiring to enjoy the pleasures of sailing and
hydroplaning had to buy two boats instead of one. The device of
this invention is also useful for water-skiing, fishing and other
boating operations. The prior art noted above applies especially to
motorboats.
BRIEF SUMMARY OF INVENTION
This invention relates to boat hulls provided with an improved
hydroplane type vane or flap. More particularly, it is concerned
with providing a boat hull equipped with improved flap or vane
means pivotally affixed to the bottom hull adjacent the stern
portion whereby the boat hull can be simply and readily converted
from a hull of one type of boat to that of another type of boat.
Thus, for example, by proper manipulation of the improved vane or
flap device of the instant invention a sailboat hull can be
converted to a motorboat hull and vice versa in a simple and
expeditious fashion. This also means that for a relatively small
investment of money a person can enjoy the pleasures of both
motorboating and sailing while buying but one boat hull and
providing one storage area for the same instead of having to buy
two entirely different kinds of boats and of having to provide
separate storage for each.
In one advantageous embodiment of the invention, the flap or vane
device has such dimensions that, when it is in a fully extended
position, it extends lengthwise substantially entirely across the
width of the boat and from the area on the bottom of the boat where
the chine lines recede upwardly in a sailing hull rearwardly to a
point which is slightly offset outwardly from the normal plane of
the transom of the hull when the said transom plane is projected
downwardly to intersect the plane of the extended flap device. By
virtue of such a preferred construction for the flap or vane, a
simple and expeditious means has been provided for converting a
hull primarily designed as a sailboat hull to one fully capable of
acting as a hydroplane and motorboat. This can be effected without
having to remove the hull from the water and putting the same in a
dry dock. This is a decided advantage when it is realized that
sailboat hulls differ radically from motorboat or hydroplane hulls,
particularly in that the chine lines recede upwardly at the stern
portion of the hull in a sailing hull, whereas in a hydroplane type
of hull, the chine lines extend to the stern approximately parallel
with the rail of the hull.
DESCRIPTION OF THE DRAWINGS
The various advantages of the instant invention will become more
apparent by reference to the following drawings, wherein:
FIG. 1 is a side elevational view of a sailboat type hull provided
with the improved stern flap device of the instant invention;
FIG. 2 is a cross-sectional view taken on line 2--2 of FIG. 3, with
the flap device being shown in cross-section in its retracted
position and in dotted lines in its extended hydroplaning
position;
FIG. 3 is an end elevational view of the transom of the boat hull
shown in FIG. 1.
FIG. 4 is an enlarged fragmentary sectional view taken generally
along line 5--5 of FIG. 3 and illustrates one means for anchoring a
control rod to the flap device;
FIG. 5 is a fragmentary perspective view of the bottom and stern
part of the boat hull of Fig. 1; and
FIG. 6 is a fragmentary sectional view taken within the
circumscribing line 6-6 of FIG. 5 and illustrates the manner in
which a flap element can be pivotally affixed or attached to the
boat hull in the area of the stern.
DETAILED DESCRIPTION
With further reference to the drawings, the planing device of the
instant invention preferably comprises a pair of flaps 12 and 14
which are pivotally affixed to the bottom 11 of a sailing boat hull
16 and each of which extends from the keel center line
substantially to the side 13 or 13' or chine lines 20 of the boat.
Suitably, each flap 12 and 14 is affixed to the bottom of the hull
by means of a piano hinge 50 of corrosion-resistant metal as shown
especially in FIGS. 6 and 7. The flaps are best located so that the
forward edge extends from a point on the keel center line to a
point on the chine line which points are at the same level below a
horizontal plane through the center line of the floor of the boat
at the point where the chine lines begin to recede or slant
upwardly. In other words, the juncture of the forward edge of the
flaps with the keel center line and that with the chine line are at
the above-mentioned level. As shown in FIG. 6, this results in a
dihedral angle between the flap forward edges, in the preferred
embodiment. A metal plate 18 is suitably riveted to or otherwise
attached to the inboard edge of one flap adjacent the trailing edge
whereby when the flaps are down in planing position any open space
between the inboard edges of the flaps is covered by such plate.
Preferably such metal also covers the keel center line from the
juncture with the flaps to the stem of the boat, except for the
center-board opening. Suitably, each flap 12 or 14 has a
reinforcing bar 15 at its top trailing edge to which the control
rods can be fixed.
In any event, regardless of whether the flaps comprise at least two
integrated elements, or a single element, they should preferably be
of such dimensions as indicated in FIGS. 2 and 3 whereby, when they
are in a fully extended position, they extend in one direction
substantially entirely across the width of the boat from one side
chine line 20 to the other chine line 20 and in another direction
from the area on the bottom of the boat hull 16 where the chine
portions recede upwardly rearwardly to a point which is slightly
off-set outwardly from the normal plane of the transom 22 of hull
16 when the transom plane is projected downwardly to intersect the
plane of the extended flap device which, in effect, now constitute
projections of the chine lines 20--20 by virtue of the extended
outboard edges 24 of the flap elements 12 and 14.
In other words, the flap elements 12 and 14 when selectively
lowered from the retracted position of FIG. 1 act to extend the
normal chine lines 20 substantially straight out and preferably to
a point at least at the transom line which is the desirable hull
structure or condition for motorboating or hydroplaning. When
retracted, the flaps parallel the normal chine lines 20--20 of the
sailing hull depicted in FIG. 1 so that the hull 16 when equipped
with the usual mast 26 and movable center board 28 sealed to the
hull bottom can serve as a true and efficient sailing hull.
In a further advantageous embodiment of the invention and as
indicated particularly in FIG. 5, the trailing edges 30 of the flap
elements are slightly offset outwardly of the bottom edge 23 of
transom 22 in order to accommodate control rods 32 pivotally
connected at one extremity thereof to a flap element by pin
assemblies 34 and saddles 36 made of brass or other corrosion
resistant metal affixed directly to the flaps 12 and 14.
Two or more control rods 32 can be affixed to each flap. In a
preferred arrangement for locking control rods 32 in the desired
position, the rods are provided with spaced holes 33 adapted to
register with a single hole 37 for each rod in transom 22. A bolt
35 threaded at at least one end passes through the hole 37 and a
hole 33 and is drawn up and secured by tightening a keeper 40. The
holes 33 are suitably spaced, for instance, at such distance to
maintain a flap 12 or 14 closely against bottom 11 of the hull for
sailing position, or at a proper distance to hold the flap in the
extended chine line position for planing. If desired, the flap can
be adjusted to a slightly higher or lower than extended chine line
position by means of additional holes in rods 32, secured as
described. Also if desired, the outboard rods can be retracted to a
higher position than the inboard rods to provide a deeper
V-configuration to the flaps. In still another embodiment the rods
can be lowered and retracted by conventional hydraulic means such
as are well-known in operating boat levelers; and, if desired, the
rods can be disposed within the boat at the inside of the
transom.
The flaps 12 and 14 can be pivotally secured to the bottom of the
hull in various ways. As indicated particularly in FIG. 6, they can
be advantageously affixed by means of suitable piano-type hinge
assemblies 50. In the area where the flaps 12 and 14 join the hull
or at the piano hinge-type joints, the piano hinge is countersunk
into the supporting flap and tapered section to conform to the
contour of the chine line to avoid "stepping" and built-in
turbulence producing element that can cause serious problems with
the otherwise smooth flow of water past the hull 16 or adversely
affect movement of the hull 16 or adversely affect movement of the
hull over the water.
In a preferred dihedral form, the angle of the flaps 12 and 14 is
so selected that their junctures with the chine lines 20--20 and
the keel center line 16 inches are all at substantially the same
level with respect to a horizontal plane through the center line of
the floor of the boat. The angle at the meeting of the flap
elements 12 and 14, i.e., the V at the center line can change from
about 5 inches at the hinge line to 1 1/2 inches at the transom in
a typical arrangement. The flaps can be made of any suitable
material, such as marine plywood, fiberglass, aluminum, etc. or
various combinations thereof. One advantageous type is plywood
covered with a layer of fiberglass. Although each flap can form a
relatively straight line or flat surface, alternatively it may be
slightly contoured from front to rear.
It will also be noted by reference to the drawing that the transom
22 can be a reverse sloping and sturdy type transom and have a
removable cutaway section at the top to accommodate an outboard
motorboat when a motor is attached to a motor mount 21. This
sloping construction is advantageous because it helps to support
the rods 32 which then rest in part against transom 22 as well as
being affixed thereto as described above. In each instance, it will
be observed that the flaps 12 and 14 are so arranged as not to
interfere with the operation or attachment to the hull 16 of a
tiller or motorboat.
As shown in FIG. 1, a mast is employed at 26 when the boat hull is
used as a sailing hull and the flaps are retracted to the up
position. At the same time a rudder and tiller (not shown) are
installed at the transom, suitably supported on motor mount 21.
When the hull is employed as a hydroplane hull, the mast is
removed, along with the tiller and rudder, and a suitable outboard
marine motor installed on the motor mount 21. It is often
convenient also to install a wheel just aft of the center board,
such wheel being connected to control either rudder or motor by a
suitable series of wires. Additionally, it is convenient when
hydroplaning to install a removable windshield, removably bolted to
the top of the boat at its forward portion. The wheel and such
windshield are shown in phantom in FIG. 1.
Advantageous embodiments of the invention have been shown and
described. It is obvious various changes may be made therein
without departing from the appended claims. For instance, the boat
shown is made of marine plywood, fiberglass covered, but other
materials of construction can be used. The flap device comprises a
plurality of flaps located at an angle to each other and one said
flap is provided with a metal plate to overlap another said flap
and maintain a closed surface. Having described the invention,
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