GB997737A - Reduction in hydrodynamic drag of water buoyant vessels - Google Patents
Reduction in hydrodynamic drag of water buoyant vesselsInfo
- Publication number
- GB997737A GB997737A GB9653/63A GB965363A GB997737A GB 997737 A GB997737 A GB 997737A GB 9653/63 A GB9653/63 A GB 9653/63A GB 965363 A GB965363 A GB 965363A GB 997737 A GB997737 A GB 997737A
- Authority
- GB
- United Kingdom
- Prior art keywords
- air
- base
- craft
- water
- flat
- 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
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
- B63B1/32—Other means for varying the inherent hydrodynamic characteristics of hulls
- B63B1/34—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction
- B63B1/38—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction using air bubbles or air layers gas filled volumes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T70/00—Maritime or waterways transport
- Y02T70/10—Measures concerning design or construction of watercraft hulls
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Jet Pumps And Other Pumps (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
Abstract
997,737. Reducing skin friction of marine craft. A. P. PEDRICK. May 11, 1964, No. 9653/63. Headings B7A and B7M. In a marine craft which in its movement through water derives substantial buoyancy by reason of the base surface of its hull being at a level below that of the surface of the water through which it is moving, said base surface being over at least part of its length substantially flat, a stream of air is discharged forward of said flat part with a velocity such that its horizontal component in the direction towards the stern of the craft is equal, or nearly equal, to the velocity of the craft so that the air so discharged forms a substantially immobile mass, in the space between the flat base part and the water directly below it, such mass of air being undisturbed by the relative movement over it of any recesses or ridges formed in the base of the craft between the point of discharge of the air and the rear of the base longitudinally directly in line with said point of discharge, beyond which near extremity the air is free to rise upwardly and escape to the surface of the water in which the craft is buoyant. In Figs. 2 and 3 air taken in at 7 is discharged by a pump to below the flat base 1 of the hull which has sloping sides 2, 3. The base is provided with longitudinal fin plates 12. The outflow of air to below the base is regulated manually or automatically, e.g. by plate valves 19 (Fig. 9) adjustable by means 14 in compartments 13. The invention may be applied to existing ships with vertical sides, e.g. by providing a false side 20 (Fig. 13) sealed in airtight manner at the top by a bellows or diaphragm member 21. An alternative method (Fig. 16) is to provide concave, inclined fins 23, each projecting slightly more than the one below it. In Figs. 19 and 20 a windmill 30 drives a compressor 31 from which air is pumped out of ports 32 along the keel of a yacht, which keel has troughs formed by fins 33 running longitudinally thereof. A sculling boat for boat racing may incorporate the invention by one of the crew operating a pump, e.g. a foot operated air compressor, which causes air to flow under the base of the boat from near the bows thereof.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9653/63A GB997737A (en) | 1964-05-11 | 1964-05-11 | Reduction in hydrodynamic drag of water buoyant vessels |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9653/63A GB997737A (en) | 1964-05-11 | 1964-05-11 | Reduction in hydrodynamic drag of water buoyant vessels |
Publications (1)
Publication Number | Publication Date |
---|---|
GB997737A true GB997737A (en) | 1965-07-07 |
Family
ID=9876161
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9653/63A Expired GB997737A (en) | 1964-05-11 | 1964-05-11 | Reduction in hydrodynamic drag of water buoyant vessels |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB997737A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5284692A (en) * | 1975-12-12 | 1977-07-14 | Hydroconic Ltd | Hull with stable flow |
WO2010128870A1 (en) * | 2009-05-08 | 2010-11-11 | Cameron Grant Jones | Waterborne craft and fin incorporating air conduits for drag reduction |
-
1964
- 1964-05-11 GB GB9653/63A patent/GB997737A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5284692A (en) * | 1975-12-12 | 1977-07-14 | Hydroconic Ltd | Hull with stable flow |
WO2010128870A1 (en) * | 2009-05-08 | 2010-11-11 | Cameron Grant Jones | Waterborne craft and fin incorporating air conduits for drag reduction |
AU2010245389B2 (en) * | 2009-05-08 | 2015-03-12 | Cameron Grant Jones | Waterborne craft and fin incorporating air conduits for drag reduction |
US9003990B2 (en) | 2009-05-08 | 2015-04-14 | Cameron Grant Jones | Waterborne craft and fin incorporating air conduits for drag reduction |
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