GB2550123A - Stabiliser for a boat - Google Patents
Stabiliser for a boat Download PDFInfo
- Publication number
- GB2550123A GB2550123A GB1607934.5A GB201607934A GB2550123A GB 2550123 A GB2550123 A GB 2550123A GB 201607934 A GB201607934 A GB 201607934A GB 2550123 A GB2550123 A GB 2550123A
- Authority
- GB
- United Kingdom
- Prior art keywords
- fin
- boat
- angle
- attack
- axis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
- B63B39/06—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
- B63B1/16—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving additional lift from hydrodynamic forces
- B63B1/24—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving additional lift from hydrodynamic forces of hydrofoil type
- B63B1/28—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving additional lift from hydrodynamic forces of hydrofoil type with movable hydrofoils
- B63B1/283—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving additional lift from hydrodynamic forces of hydrofoil type with movable hydrofoils movable around a vertical axis, e.g. for steering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
- B63B1/16—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving additional lift from hydrodynamic forces
- B63B1/24—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving additional lift from hydrodynamic forces of hydrofoil type
- B63B1/28—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving additional lift from hydrodynamic forces of hydrofoil type with movable hydrofoils
- B63B1/285—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving additional lift from hydrodynamic forces of hydrofoil type with movable hydrofoils changing the angle of attack or the lift of the foil
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
- B63B1/16—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving additional lift from hydrodynamic forces
- B63B1/24—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving additional lift from hydrodynamic forces of hydrofoil type
- B63B1/28—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving additional lift from hydrodynamic forces of hydrofoil type with movable hydrofoils
- B63B1/285—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving additional lift from hydrodynamic forces of hydrofoil type with movable hydrofoils changing the angle of attack or the lift of the foil
- B63B1/286—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving additional lift from hydrodynamic forces of hydrofoil type with movable hydrofoils changing the angle of attack or the lift of the foil using flaps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
- B63B39/06—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water
- B63B39/061—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water by using trimflaps, i.e. flaps mounted on the rear of a boat, e.g. speed boat
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
- B63B1/32—Other means for varying the inherent hydrodynamic characteristics of hulls
- B63B2001/325—Interceptors, i.e. elongate blade-like members projecting from a surface into the fluid flow substantially perpendicular to the flow direction, and by a small amount compared to its own length
Abstract
Brackets 11 suitable for mounting on the stern of a boat support vertically aligned blades 12 capable of rotating about a vertical axis Y and may be mounted to the boat in pairs. Fins 20 may be in the shape of a hydrofoil and are arranged horizontally and attached at one end 20a to the vertical blades. The fins can rotate about a horizontal axis X. Rotating the fins about axis X to alter their angle of attack through the water, whilst remaining substantially normal to the direction of travel, provides an upward or downward force to the boat affecting the trim and heel angles and reducing roll and pitch motion when moving through the water. Rotating the blades to and fro about axis Y whilst changing the angle of attack of the fins can stabilise the boat when stationary.
Description
TITLE: Stabiliser for a Boat
The present invention relates to a stabiliser for a boat, especially for a power boat, and more particularly to a pair of such stabilisers positioned on either side of the stem of a boat.
It is well known to provide trim control devices on a boat which adjust the trim angle of boat so as to maximise the speed of the boat especially lifting the stem of the boat so that it planes more easily. Such devices are often in the form of flaps under the hull adjacent the stem of a boat which are not efficient hydro-dynamically. They can also be in the form of vertical plates which extend downwards from the stem transom face into the water flow, thereby deflecting the flow downwards and lifting the stem.,.
It is also well known to provide fin stabilisers to a boat often mounted amidships under the hull, but these are not easy to fit or maintain being under the hull. These stabilisers can be used to control angle of heel and rolling motion when the boat is moving through the water.
Another problem with boats is that they tend to roll in a swell when stationary, e.g. at anchor. It has been proposed to use known fin stabilisers to reduce roll when"stationary, but this is not efficient. ' t
The invention seeks to provide a novel stabiliser or pair of stabilisers with a function of controlling the boat movement by adjusting the trim and heel angles of a boat when the boat is moving through the water, reduce the rolling and pitching motions when the boat is moving forward, and controlling the boat movement when stationary to reduce the boat rolling and pitching motions.
According to the present invention there is provided a stabiliser for a boat comprising: a) a bracket for mounting on the stem of a boat, b) a fin adapted to be supported substantially horizontal in the water by said bracket c) means to rotate the angle of attack of the fin, with the fin substantially normal to the direction of travel of the boat, to give upward or downward force on the boat through the bracket, rotation of the angle of attack of the fin being caused by rotation of the fin about a first axis passing through the fin or about a first axis substantially parallel to the fin, and d) means to rotate the fin in contra-rotating directions about a substantially vertical second axis adjacent one end of the fin whilst changing the angle of attack of the fin, in use the angle of attack of the fin can be adjusted to control the boat movement when the boat is moving forward, or to control the boat movement when stationary by rotation of the fin in contra-rotating directions about the vertical second axis adjacent one end of the fin whilst changing the angle of attack of the fin.
Preferably the fin is in the shape of a hydrofoil.
Preferably the first and second axis are substantially orthogonal to each other.
Preferably the fin is substantially L-shaped at one end with the end of the L-shaped end being pivoted on a substantially horizontal axis parallel to the fin, whereby the angle of attack of the fin is caused by rotation of the fin about a first axis substantially parallel to the fin.
Preferably a pair stabilisers are provided for each boat.
Preferably rolling motion is prevented by contra-rotation of each of said pair of fins, each in contra-rotating directions, whilst changing the angle of attach of each fin.
Preferably the angle of attack of both fins are adjusted when the boat is moving forward to adjust boat trim, pitching motion, angle of heel, and/or rolling motion. The angle of attack of both fins can be the same or different. The angle of attack of one fin can be adjusted to give an upward force whilst the other produces a downward force and vice versa to adjust the angle of heel or stabilise rolling motion when the boat is moving forward.
Preferably the or each stabiliser is controlled by a control system with sensors to measure a boats attitude, to control the boat trim, angle of heel, pitching motion, and/or rolling motion when the boat is moving forward. Preferably the control system can be used when the boat is stationary to operate the stabilisers to reduce rolling and pitching motion.
An embodiment of the invention will now be described with reference to the accompanying drawings in which:
Figure 1 shows a schematic view of a first embodiment, and Figure 2 shows a schematic view of a second embodiment.
Referring to Figure 1 there is shown the rear of power boat 1 with a stem transom 2.
Mounted equidistant either side of the centreline of boat 1 are a pair of left and right stabilisers 10 arranged as a mirror image to each other.
Each stabiliser 10 has a bracket 11 with vertical blade 12 for mounting on the stem transom 2. A hydrofoil style fin 20 is adapted to be supported substantially horizontal in the water by the vertical blade 12 connected to one end of the fin.
Fin 20 is pivoted at its end 20A to the blade 12 to rotate the angle of attack of the fin about axis X, with the fin substantially normal to the direction of travel of the boat. Rotation of the angle of attack can be used to give upward or downward force on the boat by the fin through the bracket 10. In this example first axis X passing through the fin. In use the angle of attack of each fin 20 either side of the boat can be adjusted (the same or differing amounts) by adjusting the angle of attack of the fin when the boat is moving forward. This can control the boat to adjust the trim and heel angles of a boat when the boat is moving through the water, and reduce the rolling and pitching motions when the boat is moving forward,
Blade 12 rotates about a second vertical axis Y to rotate the fin in contra-rotating directions about second axis Y (substantially orthogonal to the first axis) adjacent one end of the fin 20 whilst changing the angle of attach of the fin (i.e. rotating the fin about the first axis). This motion of sweeping the fin clockwise and anticlockwise whilst changing the angle of attack of the fin, can cause the fin to exert downward or upward pressure on the water through which it travels so also causing an upward or downward pressure on the boat respectively. This motion can be used to prevent boat rolling or pitching motion when the boat is stationary.
It is envisaged that whilst one fin 20 on one side of the boat is exerting a downward force on the water, the other fin 20 on the other side of the boat will exert an upward force on the water to prevent the boat from rolling. Thus both fins are thus contra-rotated, each in opposite directions, whilst changing the angle of attach of each fin.
It is envisaged that each stabiliser 10 is controlled by a control system with sensors to measure a boats attitude, to control the trim, pitching motion, angle of heel and rolling motion of the boat when the boat is moving forward by appropriate movement of each of the two fins about the first and/or second axis. The same control system can be used when the boat is stationary to operate the stabilisers to reduce rolling motion. A disadvantage of the stabiliser shown in Figure 1 is that the first axis X is below boat in the water flow which can make it difficult to provide a strong engineering solution without it being too bulky and causing drag. As shown in Figure 2, an alternative construction is shown.
In Figure 2, the fin 20 is again hydrofoil in shape except that it is substantially L-shaped at one end 20A with the end of the L-shaped end being pivoted on a substantially horizontal axis X substantially parallel and spaced from to the fin axis, whereby the angle of attack of the fin is caused by rotation of the fin about the first axis substantially parallel to the fin. The end 20A is connected to bracket 11 to rotate about a second vertical axis Y (substantially orthogonal to the first axis X). It will be seen that the first substantially horizontal axis X can lie above the bottom of the boat protected from flow of water under the boat by the transom 2.
The arrangement shown in Figure 2 otherwise works in exactly the same way as the arrangement shown in Figure 1.
The invention provides effective control of the trim and heel of the vessel underway to give the most efficient attitude at all speeds and when LCG position and water plane loading is non-optimal. Active trim and roll stabilization by a controller underway provides comfort aboard as well as potential further efficiency gains. The functions of roll stabilisers and trim control systems are combined into a single system. Because each stabiliser of the invention is stem mounted, this provides ease of installation and maintenance over known under hull stabiliser systems. Installation can be external to the hull and is at the aft end, away from accommodation avoiding noise and the use of valuable accommodation space. Attachment to the hull is structurally advantageous compared to existing stabilisers with forces more in plane with the hull shell plating. The fin's location aft of the hull means that they will not damage the hull shell in the event that they break away as a result of hitting a submerged object.
The invention may take a form different to that specifically described above.
Further modifications will be apparent to those skilled in the art without departing from the scope of the present invention.
Claims (8)
1. A stabiliser for a boat comprising: a) a bracket for mounting on the stem of a boat, b) a fin adapted to be supported substantially horizontal in the water by said bracket c) means to rotate the angle of attack of the fin, with the fin substantially normal to the direction of travel of the boat, to give upward or downward force on the boat through the bracket, rotation of the angle of attack of the fin being caused by rotation of the fin about a first axis passing through the fin or about a first axis substantially parallel to the fin, and d) means to rotate the fin in contra-rotating directions about a substantially vertical second axis adjacent one end of the fin whilst changing the angle of attack of the fin, in use the angle of attack of the fin can be adjusted to control the boat movement when the boat is moving forward, or to control the boat movement when stationary by rotation of the fin in contra-rotating directions about the vertical second axis adjacent one end of the fin whilst changing the angle of attack of the fin.
2. A stabiliser according to claim 1, wherein the fin is in the shape of a hydrofoil.
3. A stabiliser according to claim 1 or 2, the first and second axis are substantially orthogonal to each other. I
4. A stabiliser according to claim 1,2 or 3, wherein the fin is substantially L-shaped at one end with the end of the L-shaped end being pivoted on a substantially horizontal axis parallel to the fin, whereby the angle of attack of the fin is caused by rotation of the fin about a first axis substantially parallel to the fin.
5. A stabiliser according to any preceding claim, wherein a pair stabilisers are provided for each boat.
6. A stabiliser according to claim 5, wherein rolling motion is prevented by contra-rotation of each of said pair of fins, each in contra-rotating directions, whilst changing the angle of attach of each fin.
7. A stabiliser according to claim 5 or 6, wherein the angle of attack of both fins are adjusted when the boat is moving forward to adjust boat trim, pitching motion, angle of heel, and/or rolling motion.
8. A stabiliser according to claim 5,6 or 7, wherein the angle of attack of both fins can be the same or different.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1607934.5A GB2550123A (en) | 2016-05-06 | 2016-05-06 | Stabiliser for a boat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1607934.5A GB2550123A (en) | 2016-05-06 | 2016-05-06 | Stabiliser for a boat |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB201607934D0 GB201607934D0 (en) | 2016-06-22 |
| GB2550123A true GB2550123A (en) | 2017-11-15 |
Family
ID=56297263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1607934.5A Withdrawn GB2550123A (en) | 2016-05-06 | 2016-05-06 | Stabiliser for a boat |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2550123A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3693262A1 (en) * | 2019-02-06 | 2020-08-12 | SKF Marine GmbH | Active stabilisation device and method |
| EP3693263A1 (en) * | 2019-02-06 | 2020-08-12 | SKF Marine GmbH | Active stabilizing device and method |
| IT202000000130A1 (en) | 2020-01-08 | 2021-07-08 | Diego Tarulli | STABILIZER FOR BOATS |
| WO2024038325A1 (en) * | 2022-08-17 | 2024-02-22 | Thebault Alain | Hydrofoil boat |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150239534A1 (en) * | 2014-02-24 | 2015-08-27 | Quantum Controls B.V. | Method for actively damping a ship's motion as well as such an active roll stabilisation system |
| EP3109149A1 (en) * | 2015-04-02 | 2016-12-28 | Martin Scott | Stabilising apparatus |
-
2016
- 2016-05-06 GB GB1607934.5A patent/GB2550123A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150239534A1 (en) * | 2014-02-24 | 2015-08-27 | Quantum Controls B.V. | Method for actively damping a ship's motion as well as such an active roll stabilisation system |
| EP3109149A1 (en) * | 2015-04-02 | 2016-12-28 | Martin Scott | Stabilising apparatus |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3693262A1 (en) * | 2019-02-06 | 2020-08-12 | SKF Marine GmbH | Active stabilisation device and method |
| EP3693263A1 (en) * | 2019-02-06 | 2020-08-12 | SKF Marine GmbH | Active stabilizing device and method |
| US11052979B2 (en) * | 2019-02-06 | 2021-07-06 | Skf Marine Gmbh | Active stabilizing device and method |
| US11148768B2 (en) | 2019-02-06 | 2021-10-19 | Skf Marine Gmbh | Active stabilizing device and method |
| JP7446837B2 (en) | 2019-02-06 | 2024-03-11 | エス・ケイ・エフ マリーン ゲゼルシャフト ミット ベシュレンクテル ハフツング | Active stabilization device and method |
| IT202000000130A1 (en) | 2020-01-08 | 2021-07-08 | Diego Tarulli | STABILIZER FOR BOATS |
| WO2024038325A1 (en) * | 2022-08-17 | 2024-02-22 | Thebault Alain | Hydrofoil boat |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201607934D0 (en) | 2016-06-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) | ||
| S20A | Reinstatement of application (sect. 20a/patents act 1977) |
Free format text: REQUEST FOR REINSTATEMENT ALLOWED Effective date: 20190218 Free format text: REQUEST FOR REINSTATEMENT FILED Effective date: 20181101 |
|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |