1
Dennis N Oakland: Kneeboard with retractable fins. O Brien International, November 28, 1989: US04883436 (28 worldwide citation)

A kneeboard is provided with a pair of retractable fins which are operated by a control knob mounted on the board in front of the user's knees. The control knob is connected to the fins by a pair of cables. The fins can be raised or lowered simultaneously by sliding the control knob forwardly or rea ...


2
Douglas A Geller, Stephen E Schneider, William C Holbrook: Retractable water board fin. Kransco Manufacturing, Kolisch Hartwell & Dickinson, February 21, 1989: US04805546 (27 worldwide citation)

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 selectively positioning the fin relative to the casing. In a preferred embodiment, the fin is operated by ...


3
Krzysztof Wajnikonis: Foil. August 21, 1990: US04949919 (26 worldwide citation)

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 hydrofoil base at least in the area of the hydrofoil tip. Further increase of the hydrofoil efficiency ...


4
Brix Joachim Dipl Ing: Aerodynamic body surrounded with air or water.. Mtb Manovriertech Buero, September 28, 1988: EP0283730-A1 (22 worldwide citation)

By means of a diaphragm (20) arranged its wall surface, the aerodynamic body (100) can be converted into an aerodynamic body with a changed boundary and enlarged surface for producing local excess velocities and therefore controllable vacuum zones by active volumetric flow of a fluid into the interm ...


5
Marcil Paul M: Non-heeling hull assembly. Babcock William C, September 9, 1975: US3903827 (21 worldwide citation)

A boat including a hull having a deck and bottom, a sail carrying mast, and a keel structure, with the mast and keel being pivotally supported from the hull and so operatively connected by hydraulic or mechanical means that when the boat is wind driven the mast may tilt to port or starboard with con ...


6
Burtis Samuel G: Hydrofoil-shaped stabilizing or attitude-affecting means for boats. August 21, 1973: US3753415 (20 worldwide citation)

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 axis parallel to the fore-to-aft axis of the boat. A flexible curtain assembly extends about the frame ass ...


7
Hin Chiu: Roll motion damping device for a floating body. Zentech, Baker & McKenzie, March 10, 2009: US07500440 (19 worldwide citation)

The present disclosure relates to techniques for reducing roll motion experienced by a floating vessel. The disclosure reveals several different techniques for damping roll motion, which may be used alone or in conjunction to stabilize a floating vessel. A typical disclosed embodiment of a roll moti ...


8
Joel Kurtz: Sailboat control apparatus. Jack D Slobod, August 30, 1977: US04044703 (19 worldwide citation)

A sailboat pivotally carries a pair of weighted complementary shaped keels for independent rotation about a common longitudinally directed medial hinge axis for influencing the roll, moment of inertia and draft of the boat. The keels are independently supported at variable angles with respect to the ...


9
Brighi Giorgio: Retractable hull appendages for the trim control of planing craft. Brighi Giorgio, July 7, 2004: EP1435325-A1 (18 worldwide citation)

The object of the invention consists of a pair of retractable hull appendages to be installed on planing crafts, having the shape of planes or tables or fins placed astern, parallel to the port and starboard sides capable, when lowered, to create a lifting force in correspondence to the area astern ...


10
Bernard Diziere: Device for detachably securing a centerboard to a sailboard or the like. Frost & Jacobs, August 16, 1983: US04398485 (18 worldwide citation)

The device comprises a casing adapted to be secured, as by gluing, to the sailboard, the casing having a downwardly opening, mortise-defining recess surrounded at its lowermost end by a peripheral flange, the centerboard having a tenon at its upper end adapted to be received in the mortise, the cent ...