Ships – Hull or hull adjunct employing fluid dynamic forces to... – Having fluid channeling or entrapping configuration
Reexamination Certificate
2002-09-12
2004-01-13
Avila, Stephen (Department: 3617)
Ships
Hull or hull adjunct employing fluid dynamic forces to...
Having fluid channeling or entrapping configuration
C114S291000
Reexamination Certificate
active
06675736
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is generally related to a boat which has channels formed in the rearward portion of its hull and, more particularly, to a boat which is particularly shaped to facilitate the use of a propulsor in such a way that the boat is able to achieve a more optimum planning angle and also to improve the handling characteristics of the boat.
2. Description of the Prior Art
U.S. Pat. No. 3,600,733, which issued to Lippisch on Aug. 24, 1971, describes a planing boat hull. The hull is designed for maintaining a substantially constant trim angle throughout a slow to moderate speed range, with the hull having a flat-bottom central longitudinal tunnel with its side walls tapering outwardly from bow to stem to gradually increase the tunnel width, and a central lifting surface extending longitudinally throughout the tunnel, with the lifting surface being inclined to the tunnel bottom to form a channel extending forwardly of the medial portion thereof and forming an inclined plane projecting downwardly from the tunnel bottom and extending rearwardly of the medial portion.
U.S. Pat. No. 4,713,028, which issued to Duff on Dec. 15, 1987, describes a shallow water boat design. The boat provides full operation even in shallow water utilizing an outboard motor. The boat includes a main hull, a displaceable transom to which the motor is mounted and a displaceable hull section. The displaceable transom is received in sliding engagement within two guide brackets mounted to the main hull. The displaceable hull section is connected to the displaceable transom by a hinge along a rear edge. The leading edge of the displaceable hull section is received and rests within a lip in the main hull. Actuator cylinders mounted in alignment with the guide brackets raise and lower the transom and the rear end of the displaceable hull section while the leading edge of the displaceable hull section pivots and slides in the lip. When the motor is raised for shallow water operation the displaceable hull section forms a flow channel for directing water to the propeller and intake port of the motor so as to prevent damage and provide proper and efficient water cooling.
U.S. Pat. No. 5,570,649, which issued to Austin on Nov. 5, 1996, describes a boat hull structure comprising a pair of laterally spaced hulls having V-shaped bottom portions that are each symmetrical about a vertical plane extending through its longitudinal axis. A channel defined in each bottom portion that extends substantially along the length of each hull for trapping air and water to provide lift and to reduce certain disadvantageous performance is disclosed. Each channel is defined by a pair of spaced, parallel and vertical channel walls and a horizontal base that interconnects the channel walls. A pair of strikes defined on each bottom portion that straddles the channel to define a high speed planing surface is described. The strikes preferably are located at the same elevation as the base of the channel so that the boat can plane on the strikes and the base of the channel at the same time. With this construction, the planing surface area of the boat hull structure is reduced, which enhances the speed performance of the boat hull structure.
U.S. Pat. No. 5,205,765, which issued to Holden on Apr. 27, 1993, describes a boat hull and propulsion system. A device, such as a boat hull and propulsion system, is described for effecting relative movement of a flowable substance, such as water. A channel having open upstream and downstream ends at least partially defines a flow path. The channel includes a fully laterally closed core section distal the upstream end with a fluid moving rotor rotatably mounted therein and a transition section extending forward from the upstream end of the core section. The channel configuration and rotor are adapted to permit a continual decrease in the transverse cross-sectional area of the flow path downstream along the transition section. If the device is a boat hull, the bow is configured to cause gas lubrication thereof by interaction with the water in motion. The transition sections of the channels may be open bottomed and ribs are provided to house driveshafts extending downwardly to the rotors. The bow provides lift, and downwardly facing surfaces adjacent the stem are inclined to balance this lift, so that the boat can rise on the water with an upward translating type movement. The rotors themselves are also improved.
U.S. Pat. No. 5,111,767, which issued to Haines on May 12, 1992, describes a boat hull having an underside, a transom and a recess adjacent the transom extending at partially a transverse dimension or width of the underside. There is also provided a transverse step defining a transverse boundary of the recess as well as an internal hollow venting body or reservoir having at least a pair of access ports of restrictive cross sectional size compared with the enlarged cross sectional area of the venting body. The venting body is in fluid communication with the recess and the hull exterior wherein during travel of the boat hull venting of a low pressure area adjacent the recess can take place without water gaining access to the hull interior in the event of hard turning or reversing, the water being trapped in the hollow venting body or reservoir. Preferably, the venting body is elongate having a major dimension corresponding to the enlarged cross sectional area which defines a longitudinal extent of the venting body and a minor dimension defining a transverse extent of the venting body.
U.S. Pat. No. 4,903,626, which issued to Haines on Feb. 27, 1990, describes a planing motor boat hull. The hull includes a bow, a transom, a keel and an underside having a transverse step adjacent the transom which extends partially the width of the underside and a recess bounded by the transverse stop and a pair of side walls and having an open transom end. The hull underside may further include a pair of substantially planar portions wherein each portion is located adjacent to a respective side wall of the recess. The hull underside may further include a plurality of lift strakes including an outermost lift strake terminating at or adjacent the transom, one or more intermediate lift strakes terminating short of the transom and the outermost lift strake and an innermost lift strake located adjacent to the keel terminating short of the transom ends of the one or more intermediate lift strakes.
U.S. Pat. No. 4,392,448, which issued to Shirley on Jul. 12, 1983, describes a ski boat. The ski boat is intended for producing a relatively small, well-defined wake and a relatively smooth working table. It includes a V-shaped keel section. The angle of the “V” increases towards the stern of the hull. A chine panel is mounted at each of the outboard edges of the keel section. A secondary chine is locate on each side of the keel section, being parallel to the centerline of the V-shaped keel section and following the contour of the keel section. A concave depression panel is located at the stern of the boat, extending forwardly therefrom into the keel section.
U.S. Pat. No. 5,570,650, which issued to Harley on Nov. 5, 1996, describes a surface effect vessel hull. The surface effect hull is particularly suitable for use with a catamaran vessel. The twin hulls each comprise a V-shaped portion and a recess portion that receives pressurized gas therein. The V-shaped bow portion creates dynamic lift and the pressurized air portion creates an air cushion for reduction of drag.
U.S. Ser. No. 09/871,098 which was filed by Chrunyk on Dec. 20, 2001, describes a method of controlling the attitude of a boat at high speed through boat hull design and a boat hull. The method involves a first step of forming a pair of high speed steps in the hull of the boat. The pair of high speed steps provides enough surface area to control ride attitude, while reducing the wetted area of the hull to decrease drag. A second step involves forming transition steps to provide a transition to the high
Scherer, III John O.
Schreiber Roger W.
Brunswick Corporation
Lanyi William D.
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