U.S. patent number 3,602,178 [Application Number 05/023,179] was granted by the patent office on 1971-08-31 for boat planing and brake apparatus.
Invention is credited to William B. White.
United States Patent |
3,602,178 |
White |
August 31, 1971 |
BOAT PLANING AND BRAKE APPARATUS
Abstract
Boat planing and brake apparatus having a fin connectable to a
transom of a boat and adapted to be swung between a horizontal
planing position and on inclined braking position, the fin having
an undersurface concave about a longitudinal axis.
Inventors: |
White; William B. (Victoria,
British Columbia, CA) |
Family
ID: |
21813535 |
Appl.
No.: |
05/023,179 |
Filed: |
March 27, 1970 |
Current U.S.
Class: |
114/285 |
Current CPC
Class: |
B63H
25/44 (20130101); B63B 39/061 (20130101) |
Current International
Class: |
B63B
39/00 (20060101); B63B 39/06 (20060101); B63H
25/00 (20060101); B63H 25/44 (20060101); B63b
001/22 () |
Field of
Search: |
;114/66.5P |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Farrell; Andrew H.
Claims
What I claim is:
1. Boat planning and brake apparatus including
a. a fin having an undersurface concave about a longitudinal
axis,
b. means for connecting one end of the fin to a transom of a
boat,
c. said means being constructed and arranged to permit the fin to
be disposed between a planing position in which it is substantially
parallel to the bottom of the boat and a braking position in which
it inclines downwards.
2. Apparatus as claimed in claim 1, wherein the means (b)
includes:
d. baseplate plate adapted to be secured to the transom, the base
plate having spaced parallel tracks.
e. a carrier plate slideably mounted between the tracks,
f. means on the carrier plate engageable with a base plate for
releasably securing the carrier plate against movement,
g. a flange extending from the carrier plate,
h. means for swingably connecting the fin adjacent a forward end
thereof for swinging movement about a beam axis so as to permit the
fin to be disposed in selected inclined positions,
i. means for releasably securing the fin against movement about
said athwart ship axis.
3. Apparatus as claimed in claim 1, wherein the fin is of thin
sheet metal having flat side portions inclined downwards from the
longitudinal axis of the fin, the side portions terminating in
downwardly curved side edge portions.
4. Apparatus as claimed in claim 3, wherein the flat side portions
are inclined between 15.degree. to 25.degree. from the
horizontal.
5. Apparatus as claimed in claim 3, wherein the flat side portions
are inclined at an angle of 20.degree. from the horizontal.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an attachment for boats and more
particularly to a fin apparatus which is adjustable to aid the boat
to plane, or to serve as a drag or brake.
2. Prior Art
Attachments which serve as trolling brakes for motor boats
permitting a boat engine to run at a reduced speed while trolling,
without unduly reducing motor speed and which can be adjusted to
permit the boat plane at speeds lower than designed planing speeds.
Heretofore usually have been constructed and arranged so as to be
swingable about a beam axis fixed in elevation relative to the boat
bottom.
Furthermore, attachments of prior art, in order effectively to aid
the boat to plane have been of relatively large size and have,
consequently, increased the effective area of the boat thus
increasing resistance.
Most attachments of prior art have not effectively helped to
stabilize the boat so as to reduce tendency to swing from side to
side while planing.
SUMMARY OF THE INVENTION
The present invention provides a planing and brake apparatus for
boats. The apparatus can be adjusted between a downwardly inclined
braking position and a horizontally planing position, but is also
capable of being adjusted vertically so as to obtain optimum
effectiveness regardless of the planing of the boat-- draft varying
with load.
The apparatus of the present invention also stabilizes the boat so
as to reduce its tendency to yaw when planing and, furthermore, is
constructed and arranged so as to have small wetted area.
The apparatus of the present invention, furthermore, is relatively
inexpensive to manufacture easy to apply to a boat and is simple to
operate.
The apparatus of the present invention includes:
A fin having an undersurface concave about a longitudinal axis,
Means for connecting the fin at a forward end to a transom of a
boat, said means being adjustable to permit the fin to be disposed
between a planing position in which it extends rearwards from the
transom in a substantial alignment with a bottom of the boat and a
braking position in which it is downwardly inclined, said means
being adjustable vertically to permit the fin to be raised or
lowered relative to the bottom of the boat.
A detailed, description following, related to drawings, gives
exemplification of preferred embodiment of the invention which,
however, is capable of expression in structure other than that
particularly described and illustrated.
DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side view of a portion of a boat with apparatus of the
invention attached,
FIG. 2 is a stern view of the boat of FIG. 1,
FIG. 3 is an enlarged isometric view of the apparatus, a fin being
partially shown,
FIG. 4 is an enlarged partly sectioned plan of the fin,
FIG. 5 is a front elevation of a fin.
DETAILED DESCRIPTION
Figs. 1 and 2
A portion of a boat 10 has a stern transom 11 and a planing bottom
12, an outboard motor 13 being secured centrally to the transom.
Planing and brake apparatus 14 of the invention is secured to the
transom on opposite sides of the motor 13. Each apparatus includes
a fin 15 and means 16 for securing a forward end 17 of each fin to
the transom adjacent the bottom 12 of the boat, the means 16 being
constructed and arranged so that the fin can be swung about an
axis, termed a beam axis, which extends perpendicular to a fore and
aft axis of the boat so that the fin can be disposed between a
planing position as shown in full outline at 15, in FIG. 1 in which
it extends substantially parallel to the bottom of the boat and a
braking position 15.1 shown in broken outline in which it is
downwardly inclined from the bottom of the boat so as to serve as a
drag reducing the speed of the boat without unduly reducing the
speed of the motor.
Figs. 3, 4, and 5
FIGS. 3, 4, and 5, illustrate, in detail, the boat planing and
brake apparatus 14. The means 16 for attaching the fin 15 to the
transom includes a base plate 18 having a pair of parallel spaced
apart tracks 19, the track being provided with inwardly turned lips
20 and 20.1. The base plate has holes 21 in opposite side marginal
portions so that the plate can be bolted to the transom 11 in such
a position that the tracks 19, when viewed from the stern of the
boat, extend vertically. The plate also has a central vertically
extending row of holes 22. A carrier plate 23 having a central
flange 24 fits between the tracks 19 being restrained by the lips
20 and 20.1 to slide within the tracks.
A thumb screw 25, in the carrier plate, can be passed through any
one of the holes 22 so as to provide vertical adjustment of the
carrier plate relative to the bottom of the boat.
The fin 15, see particularly FIGS. 4 and 5, is a thin metallic
construction, symmetrical about a longitudinal axis 30 having a
pair of flat portions 31 sloping downwards from the longitudinal
axis and terminating in downwardly curved side edge portions
32--32, defining a concave undersurface 33. As best shown in FIG. 4
the flat portions 31--31 are inclined from the horizontal at an
angle A, typically about 20.degree. --inclination between
15.degree. and 30.degree. being suitable.
The fin also includes a longitudinally extending central T-shaped
rib 35 having a vertical leg 36 and a cross piece 37. The fin,
including the rib and the base plate 18 can be extruded
aluminum.
A forwardly opening slot 38 is formed in one of the flat portions
31 adjacent the leg 36, for receiving the flange 24. The fin is
mounted on a pin 39 extending within the slot, passed both through
the leg 36 of the rib and the flange, the pin being swedged at each
end. A bolt 40 passes through the leg 36 and through a curved slot
41 in the flange 34, see FIG. 3, the bolt having a thumb screw 42,
providing means for positioning the fin at a desired inclination.
The crosspiece 37, as seen in FIGS. 3 and 5, is relieved at the
forward end of the fin to provide clearance for the flange 24.
OPERATION
The fin, it will be appreciated, can be easily and quickly adjusted
by loosening the wingnut 42, rotating the fin to a desired position
then retightening the wingnut.
The adjustable carrier plate 33 provides vertical adjustment of the
fin, particularly in a planing position, so as to permit a boat
operator to achieve optimum planing effectiveness according to
load, speed and other conditions.
The concave undersurface of the fin inhibits lateral movement of
water and, consequently, improves lift. The curved side edge
portions 32--32 act as guiding vanes to effect longitudinal
stabilization at high speed.
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