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7497752 |
Fin attachment system and method
A fin box for releasable attachment of a fin having at least one fin-tab, the fin box adapted for insertion into and retention within a water board, the fin box including: a generally elongate body...
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7435147 |
Breakaway skeg for a marine propulsion device
A marine propulsion device is provided with a breakaway skeg having first and second attachment points. The first and second attachment points are configured to result in the second attachment...
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7244157 |
High-lift, low drag fin for surfboard and other watercraft
This invention discloses a fin, for use on a surfboard and other watercraft, of a low-drag, high-lift, high-aspect-ratio, low-sweepback-angle planform of symmetrical foil section, with a fit root...
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7198532 |
Fin attachment system
A fin box for releasable attachment of a fin to the body of a surfboard or the like; said fin including a fin-tab associated therewith; said fin box adapted for insertion into and retention within...
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6991504 |
Surfboard fin mounting system
Provided is a system including a fin box that allows surboard fins to be installed, removed or adjusted to the front or rear of the board within the box and a means for installing the box on the...
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6935910 |
Watersport board fin assembly and methods of using same
Fin assemblies for a variety of watersport boards including wakeboards, sailboards, surfboards and the like. The fin assemblies include a fin cap, at least one fin base and at least one locking...
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6916220 |
Removable fin system
A pivotal fin system, for use with an aquafoil, such as surfboards, body boards, wave skis, sail boards, wake boards and the like, comprising a pot ( 3 ) and a fin ( 2 ), having a tab ( 18 )...
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6247985 |
Surfboard box cover
In mounting of a fin on a surfboard, there is formed a through hole within the surfboard with the fin to be mounted within the through hole and extend from the underside of the surfboard. The...
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5839700 |
Articulated fin
An articulated fin of the present invention includes a nose section, a tail ection, an upper flexible control surface, and a lower flexible control surface. The upper and lower flexible control...
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5649846 |
Pivotable fin system
A pivotable fin system, for use with an aquafoil such as a surfboard, comprising a plug and a fin having a main portion and a tab. The plug mounts in the surfboard, and has a central slot for...
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5503097 |
High performance centerboard system
A movable centerboard for water craft capable of multiple settings having an upper position within the hull, a lower position at full depth below the hull and multiple settings therebetween such...
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5480331 |
Flexible surfboard fin
A flexible fin for surfboards, sailboards and other watercraft comprises a thin core sheet made of laminated fiberglass sandwiched between two slabs of closed-cell polyurethane foam. The flexible...
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5385495 |
Self adjusting water ski assembly
A water ski fin extends through the rear of a water ski. Pivotally connected to a lower portion of the fin is a wing extending substantially perpendicularly from the fin. A device is connected to...
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5224435 |
Fin box assemblies for windsurfers
A windsurfer board is formed, towards the tail end thereof, with a slot in which a box is fitted. The box provides a mounting for a fin which is movable, while in use, relative to the board in such...
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5195915 |
Sealing lip of plastic for the lower end of the inlet opening for a dagger board housing and dagger board, particularly of sailboards
The lip-type seal for the bottom closure of the inlet opening (2) for dagger board housing (3) and dagger board (4), intended for sailboards, exhibits two mounting strips (6) of a hard plastic with...
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5181678 |
Flexible tailored elastic airfoil section
A flexible airfoil section for a wing or a blade comprising a streamlined shape and an elastic structure whose stiffness distribution along its chord and span is tailored to provide a desirable...
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5176096 |
Assembly for fastening a fin to a sailboard
The assembly for fastening a fin to a sailboard comprises a fin receiving box secured in the sailboard and having an opening to receive a fin shaft. A conical or wedge seat is provided between the...
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5133681 |
Frangible sailboard fin retaining member
A frangible sailboard fin retainer and method of releasably retaining a fin to a sailboard fin box including forming complementary openings in the fin and the fin box, inserting a bolt assembly...
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5129344 |
Actuating mechanism
An actuating mechanism is provided for controlling external devices by means of coaxial actuating cables or other suitable linkages. The actuator includes an internal slide element movable to...
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5036785 |
Lightning protection installation on a boat
A lightning protection installation for boats comprising a copper lightning rod mounted on the top of the mast or, in the case of a power boat, mounted on the deck, a copper wire attached to the...
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5030151 |
Flanged fin for watercraft
The invention relates to fins for watercraft such as surfboards, surf-skis, sailboards, kayaks, canoes, skiffs, water-skis, and also "soft" plastic watercraft such as polyethylene boards. These...
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5022337 |
Lift producing device exhibiting low drag and reduced ventilation potential and method for producing the same
A lift producing device is disclosed which is adapted to be connected to a vehicle to provide lift to the vehicle when the vehicle is moved relative to a first fluid medium having a first density...
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4949919 |
Foil
Hydrofoil families which have high lift and low drag coefficients. Induced vorticity is partly suppressed by introducing a longitudinal component of the flow directed from the foil tip towards the...
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4940438 |
Surfboard with angularly related fins
A surfboard is provided with fins, at least one of which is canted at an angle to the longitudinal axis and also tilted relative to the surface of the board, and reinforcing fibers are applied to...
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4936243 |
Transom rudder seat
This invention is a transom-mounted combination casting seat and anti-drift fin, herein called a transom fin seat. The transom fin seat includes a fin stem, a fin deployed at the bottom of the fin...
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4805546 |
Retractable water board fin
A generally trapezoidal fin (22) is pivotally fastened to a casing which can receive the entire fin, permitting total retraction of the fin. The casing is formed with at least one notch (42) for...
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4766830 |
Boat, especially a catamaran, with large deck space and collapsible frame
A boat, especially a catamaran, having a rectangular collapsible frame with a one-man mast stepping structure. The tubular frame is comprised of fore, aft and central sub-frame assemblies which can...
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4759552 |
Lip gasket of a synthetic resin, especially for the daggerboard well of a sailboard
The lip gasket for the daggerboard well of a sailboard (1) exhibits two supporting strips (3) embedded in the board body on both sides of the daggerboard well opening (2), as well as two cover...
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4759308 |
Sealing lip assembly for surfboards and sailboats
A sealing lip assembly for surfboards or sailboats, which closes the underwater side of the opening of the centerboard case or fin case in a virtually flow-tight and non-vortical manner in every...
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4561371 |
Catamaran stabilization structure
A catamaran stabilization structure for catamaran sailboats which includes a centerboard and dagger-boards. The centerboard has a double wing stabilizer with adjustable pitch. The dagger-boards...
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4493665 |
Hydrofoil
A fin which can be secured in the channel of a curved fin box in a plurality of locations. The fin has a grooved flange which mates with the open channel of the fin box. One wall of the channel has...
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4421492 |
Adjustable fin system
A fin system for surfboards, wind surfers or similar sporting equipment having an elongated channel extending lengthwise underneath the board. The fin is adjustable in the channel by the...
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4377124 |
Sailboat with an inclinable keel board
The invention relates to a sailboat with a keel board that is inclinable sideways. A single keel board is resiliently inclinable due to the effect of the water which rotates it about an axis...
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4341176 |
Air foil with reversible camber
A reversible airfoil generally wing-like in shape comprising at least two spaced apart rigid spars having at least two slots therethrough, bars projecting through the slots in each rigid spar, each...
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4325154 |
Surfboard fin
A surfboard fin is disclosed which is formed of shaped plastic opposed members which are joined and sealed to form a hollow light-weight buoyant construction, which provides an external contour to...
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4280433 |
Underwater appendages for vessels
A keel assembly or similar fin-like underwater appendage for a boat is provided which is adjustable to adapt its characteristics to the operating conditions of the boat, for example to optimize...
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4037279 |
Water ski
A water ski comprising a water ski body having a forward end, a rear end, a top side and a bottom side, and a fin extending downwardly from the bottom side, wherein the fin has an elastic portion...
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4029037 |
Process for reinforcing plastic material and products therefrom
A plastics structure, such as the center-board for a sailing boat or a vehicle body panel, comprises a foamed plastics material containing arrays of high tensile steel reinforcing wires having a...
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3902441 |
Sailboat having retractable and self-ejectable hydraulic controls
A small lightweight sailboat enabling it to be readily transported in passenger vehicles such as station wagons and the like is provided with hydraulic controls integrally and movably coupled to...
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3871322 |
SNUBBER FOR THE DAGGER BOARD OF A SAILBOAT
A snubber for the dagger board of a sailboat includes two rubber fins fastened to the deck of the sailboat and extending toward each other in cantilever fashion over a vertical slot formed through...
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3753415 |
HYDROFOIL-SHAPED STABILIZING OR ATTITUDE-AFFECTING MEANS FOR BOATS
A hydrofoil-shaped stabilizer or attitude-changing means for boats, having an elongated frame assembly adapted to be connected to a submerged portion of the hull of a boat with its longitudinal...
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3379164 |
Nautical apparatus having a removable centerboard
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3314390 |
Centerboard snubber
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3226738 |
Self-trailing boats
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