GB1130179A - Hydrofoil craft with air exit apertures in the hydrofoil - Google Patents
Hydrofoil craft with air exit apertures in the hydrofoilInfo
- Publication number
- GB1130179A GB1130179A GB54392/65A GB5439265A GB1130179A GB 1130179 A GB1130179 A GB 1130179A GB 54392/65 A GB54392/65 A GB 54392/65A GB 5439265 A GB5439265 A GB 5439265A GB 1130179 A GB1130179 A GB 1130179A
- Authority
- GB
- United Kingdom
- Prior art keywords
- hydrofoil
- piston
- channels
- chamber
- spring
- 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.)
- Expired
Links
- 230000004048 modification Effects 0.000 abstract 4
- 238000012986 modification Methods 0.000 abstract 4
- 238000006073 displacement reaction Methods 0.000 abstract 1
Classifications
-
- 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
- B63B1/248—Shape, hydrodynamic features, construction of the foil
Abstract
1,130,179. Hydrofoil vessels. SUPRAMAR A.G. 22 Dec., 1965, No. 54392/65. Heading B7A. [Also in Division F2] Control of the lift produced by a hydrofoil 8 in accordance with changes in its angle of attack is effected by atmospheric air flowing into the boundary layer through a plurality of apertures or channels 16 in the uppermost surface of the hydrofoil, the flow of air being governed by a valve 1 in response to changes in pressure in a chamber 7 having a plurality of apertures or channels 9 communicating with the uppermost surface of the hydrofoil adjacent its leading edge. The valve 1 comprises an air inlet 3 and a conduit 14 connected to the channels 16 by a common chamber 15 within the body of the hydrofoil, said inlet and conduit being normally closed by a piston 4<SP>1</SP>, which is biased by an adjustable compression-spring 5 and attached to a further piston 4<SP>11</SP>. When the angle of attack increases, the corresponding reduction in pressure within the chamber 7 is transmitted to a chamber 21 containing the spring 5 through a conduit 6, whereby atmospheric pressure acting upon the piston 4<SP>11</SP> through an aperture 2a displaces the piston 4<SP>1</SP> against the action of said spring to permit air to flow into the chamber 15 and thence through the channels 16 so that the pressure on the uppermost surface of the hydrofoil rises sufficiently to keep the lift constant. The loading of the spring 5 is changed by displacement of an abutment disc 12 when a screw-threaded spindle 11 is rotated by a gear-wheel 13 coupled to control means (not shown in the drawing) situated in the control region or area of the vessel to which the hydrofoil is attached. The piston 4<SP>11</SP> can be displaced against the action of the spring 5 by a lever 23, which is connected by a cable 24 to control means in the aforesaid region. In a modification, Fig. 2 (not shown), the conduit 14 is connected to a plurality of channels (16<SP>1</SP>) in the lowermost surface of the hydrofoil through a common chamber (15<SP>1</SP>) and the spring 5 is omitted, the pistons 4<SP>1</SP>, 4<SP>11</SP> being controlled by pressure changes in chambers (7<SP>1</SP>, 711), respectively, which chambers are within the hydrofoil and communicate with areas of the hydrofoil adjacent its leading edge through upwardly and downwardly orientated channels (9<SP>1</SP>, 9<SP>11</SP>), respectively, whereby the lift effected by the hydrofoil is kept constant when the angle of attack becomes negative. Atmospheric air may be admitted to a conduit (10), through which pressure changes are transmitted from the chamber (7<SP>11</SP>) to the piston 4<SP>11</SP>, by a needle valve (17) so as to regulate the thrust exerted by the piston 4<SP>11</SP> on the piston 4<SP>1</SP>. Alternatively, the piston 4<SP>11</SP> may be biased by a compression-spring (not shown in the drawing). In a further modification, Fig. 3 (not shown), the chamber 15 and channels 16 according to Fig. 1 are provided in the hydrofoil in addition to the various chambers and channels that are provided in the modification according to Fig. 2, the chambers 15, (15<SP>1</SP>) being fed with air through separate conduits (14<SP>1</SP>, 14<SP>11</SP>), which are controlled by the pistons 4<SP>1</SP>, 4<SP>11</SP>, respectively. Compensation for pressure differences in the chambers (7<SP>1</SP>, 7<SP>11</SP>) is provided by appropriate differences in the diameters of said pistons. A compression-spring (5<SP>1</SP> or 511) engages with each piston. In another modification, Fig. 4 (not shown), the flow of air through the chamber 15 is governed by a valve-member (18) lodged therein and controlled by a spring-biased piston (4a), which is subjected to atmospheric pressure on one side and the pressure prevailing in the chamber 7 on the other side. The piston (4a) may be replaced by either a bellows or a corrugated diaphragm. The channels 9 may be screened from the regions of the hydrofoil containing the channels 16 by a pair of fins (20), Figs. 5 and 6 (not shown), so as to prevent undesirable operation of the valve 1 in response to changes of pressure caused by the air entering the boundary layer.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB54392/65A GB1130179A (en) | 1965-12-22 | 1965-12-22 | Hydrofoil craft with air exit apertures in the hydrofoil |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB54392/65A GB1130179A (en) | 1965-12-22 | 1965-12-22 | Hydrofoil craft with air exit apertures in the hydrofoil |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1130179A true GB1130179A (en) | 1968-10-09 |
Family
ID=10470864
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB54392/65A Expired GB1130179A (en) | 1965-12-22 | 1965-12-22 | Hydrofoil craft with air exit apertures in the hydrofoil |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1130179A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2210829A (en) * | 1987-10-14 | 1989-06-21 | Ricoh Kk | Offset printer and plate maker |
GB2394515A (en) * | 2002-09-27 | 2004-04-28 | Marine Current Turbines Ltd | Equalising static pressures acting upon rotor blades and hydrofoils |
CN112373619A (en) * | 2020-11-24 | 2021-02-19 | 天津小鲨鱼智能科技有限公司 | Hydrofoil |
-
1965
- 1965-12-22 GB GB54392/65A patent/GB1130179A/en not_active Expired
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2210829A (en) * | 1987-10-14 | 1989-06-21 | Ricoh Kk | Offset printer and plate maker |
GB2210829B (en) * | 1987-10-14 | 1991-09-04 | Ricoh Kk | Offset printer having a press drum larger than its rubber drum. |
GB2394515A (en) * | 2002-09-27 | 2004-04-28 | Marine Current Turbines Ltd | Equalising static pressures acting upon rotor blades and hydrofoils |
GB2394515B (en) * | 2002-09-27 | 2006-05-31 | Marine Current Turbines Ltd | Improvements in rotor blades and/or hydrofoils |
CN112373619A (en) * | 2020-11-24 | 2021-02-19 | 天津小鲨鱼智能科技有限公司 | Hydrofoil |
CN112373619B (en) * | 2020-11-24 | 2023-01-31 | 天津小鲨鱼智能科技有限公司 | Hydrofoil |
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