IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0675611
(1984-11-28)
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발명자
/ 주소 |
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인용정보 |
피인용 횟수 :
17 인용 특허 :
2 |
초록
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An apparatus for aiding in the steerage of boats has one or more fins connected to each side of the aft part of the boat, such that the fins are entirely above the water until the boat is so heeled as to have moderate helm, and after that the fin(s) on the heeled-down side become progressively more
An apparatus for aiding in the steerage of boats has one or more fins connected to each side of the aft part of the boat, such that the fins are entirely above the water until the boat is so heeled as to have moderate helm, and after that the fin(s) on the heeled-down side become progressively more immersed as the boat heels further. The spanwise axes of the fins are about vertically disposed when the boat is upright. The cordwise axes of the fins slope inward toward the longitudinal axis of the boat. The fore-aft sectional shape of the fins may be asymmetrical to improve the lift/drag characteristics. One fin on either side may be attached spanwise to a shaft mounted in a shaft housing extending obliquely through the hull and deck; the shafts may be fixed at several angles, or actively adjusted to counter variations in the magnitude of weather-helm and lee-helm experienced by the boat.
대표청구항
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1. In a water-borne boat having a longitudinal axis, an auxiliary steering device, comprising: at least one fin connected to the aft half of said boat transversely from said longitudinal axis; said fin having a cordwise axis that angles inward toward said longitudinal axis as said cordwise axis
1. In a water-borne boat having a longitudinal axis, an auxiliary steering device, comprising: at least one fin connected to the aft half of said boat transversely from said longitudinal axis; said fin having a cordwise axis that angles inward toward said longitudinal axis as said cordwise axis projects forward; said fin having a spanwise axis with a generally vertical disposition when said boat is upright; said fin being disposed so that at least part of it is close to said boat and all of it is out of the water when said boat is upright in a flat sea; and said fin being sized, shaped, and positioned so that said fin is generally out of the water until said boat is so heeled as to have an undesired amount of helm, and after that, said fin, when connected to the heeled-down side of said boat, becomes progressively more immersed with further heeling of said boat, until fully immersed, relieving part but not all of the helm experienced by said boat when heeled down on that side. 2. The device as recited in claim 1, wherein: said fin has a fore-aft sectional shape that is symmetrical; said fin has a flange connected near its upper extremity, extending inboard about horizontally when said boat is not heeled and about an equal distance from the forward and aft edge of said fin; such that a single said fin can be mounted on either side of said boat with its said cordwise axis angled inward toward said longitudinal axis of said boat. 3. In a water-borne boat having a longitudinal axis, an auxiliary steering apparatus, comprising: at least one fin connected to each side of the aft third of said boat; said fins having cordwise axes that substantially angle inward toward said longitudinal axis as they project forward; said fins having spanwise axes a generally vertical disposition when said boat is upright; said fins being disposed so that at least part of each is close to said boat and all of each is out of the water when said boat is upright in a flat sea; and said fins being sized, shaped, and positioned so that said fins are generally out of the water until said boat is so heeled as to have moderate helm, and after that, said fin(s) on the heeled-down side of said boat become progressively more immersed with further heeling of said boat, until fully immersed, relieving part but not all of the helm experienced by said boat. 4. The apparatus as recited in claim 3, wherein said spanwise axes of said fins incline outboard from vertical, when said boat is upright, at an angle of about ten to twenty degrees as they project downward, and said cordwise axes incline inward at an angle of about fifteen to forty degrees to said longitudinal axis. 5. The apparatus as recited in claim 3, wherein said fins have spans of about ten to twenty percent of the maximum beam of the boat, and have cords of about one-half to one-fourth the length of the spans. 6. The apparatus as recited in claim 3, wherein said fins have inboard and outboard surfaces, and fore-aft sectional shapes with said inboard surfaces disposed farther said cordwise axes over most of their lengths than said outboard surfaces. 7. The apparatus as recited in claim 3, wherein the cords at the bottom of said fins incline inward toward said longitudinal axis of said boat at a few degrees more acute angle than do the cords at the top of said fins. 8. The apparatus as recited in claim 3, further comprising flanges connected near the upper extremities of said fins, and wherein said boat has a deck, said flanges extend inboard about horizontally when said boat is upright, and said flanges are rigidly affixed to said deck. 9. The apparatus as recited in claim 3, wherein a plurality of said fins are connected to each side of said boat, disposed at different distances above the water, such that as said boat progressively heels, an increasing number of said fins on the heeled-down side of said boat will become immersed in the water. 10. The apparatus as recited in claim 3, wherein said fins are positioned so that, when said boat is upright, they do not extend beyond the most outboard extremity of the transverse section at which they are connected to said boat. 11. The apparatus as recited in claim 3, wherein said boat has a stern transom, and said fins are connected to said stern transom. 12. The apparatus as recited in claim 3, wherein said boat has a hull and deck, and further comprising: shafts attached spanwise to one said fin on each side of said boat; shaft housings extending obliquely through said hull and said deck on each side of said boat, with said shafts inserted through said shaft housings; means for rotating said fins attached to said shafts; and means for fixing said fins at different angles or rotation. 13. The apparatus as recited in claim 12, further comprising: a rudder for said boat; a main steering mechanism to activate said rudder; and a linking means connected between said means for rotating said fins and said main steering mechanism; so that as said main steering mechanism is moved to rotate said rudder, said fins will be rotated in the same direction as said rudder. 14. In a water-borne boat having a longitudinal axis, an auxiliary steering apparatus, comprising: at least one fin connected to each side of the aft third of said boat; said fins having spans of about ten to twenty percent of the maximum beam of said boat and having cords of about one-half to one-fourth the length of the spans; said fins having cordwise axes that incline inward toward said longitudinal axis of said boat at an angle of about fifteen to forty degrees as they project forward; said fins having spanwise axes that incline outboard from vertical, when said boat is upright, at an angle of about ten to twenty degrees as they project downward; said fins being disposed so that at least part of each is close to said boat and all of each is out of the water when said boat is upright in flat seas; and said fins being sized, shaped, and positioned so that said fins are generally out of the water until said boat is so heeled as to have moderate helm, and after that, said fin(s) on the heeled-down side of said boat become progressively more immersed with further heeling of said boat, until fully immersed, relieving part but not all of the helm experienced by said boat. 15. The apparatus as recited in claim 14, wherein said fins have inboard and outboard surfaces, and fore-aft sectional shapes with said inboard surfaces disposed farther from said cords, over most of their length, than said outboard surfaces. 16. The apparatus as recited in claim 14, further comprising flanges connected near the upper extremities of said fins, and wherein said boat has a deck, said flanges extend inboard about horizontally when said boat is upright, and said flanges are rigidly affixed to said deck.
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