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FR2230540A1 - Method of reducing drag on ships hulls - layer of air around hull is formed from fresh air and air within layer - Google Patents

Method of reducing drag on ships hulls - layer of air around hull is formed from fresh air and air within layer

Info

Publication number
FR2230540A1
FR2230540A1 FR7301220A FR7301220A FR2230540A1 FR 2230540 A1 FR2230540 A1 FR 2230540A1 FR 7301220 A FR7301220 A FR 7301220A FR 7301220 A FR7301220 A FR 7301220A FR 2230540 A1 FR2230540 A1 FR 2230540A1
Authority
FR
France
Prior art keywords
air
layer
hull
reducing drag
around hull
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.)
Granted
Application number
FR7301220A
Other languages
French (fr)
Other versions
FR2230540B1 (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FIACRE JEAN MARIE
Original Assignee
FIACRE JEAN MARIE
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by FIACRE JEAN MARIE filed Critical FIACRE JEAN MARIE
Priority to FR7301220A priority Critical patent/FR2230540A1/en
Priority to FR7307442A priority patent/FR2230541A2/en
Priority to FR7313276A priority patent/FR2283045A2/en
Priority to FR7325258A priority patent/FR2236717A2/en
Publication of FR2230540A1 publication Critical patent/FR2230540A1/en
Priority to FR7628152A priority patent/FR2364809A2/en
Application granted granted Critical
Publication of FR2230540B1 publication Critical patent/FR2230540B1/fr
Granted legal-status Critical Current

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
    • 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
    • B63B2001/387—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction using air bubbles or air layers gas filled volumes using means for producing a film of air or air bubbles over at least a significant portion of the hull surface
    • 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)
  • Ocean & Marine Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Fluid-Damping Devices (AREA)
  • Vibration Prevention Devices (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)
  • Underground Or Underwater Handling Of Building Materials (AREA)

Abstract

The hull used is of the conventional type unmodified in hydraulic design. The hull is surrounded underwater by a film of compressed air delivered from blowers mounted in the ship. Two blower systems are provided. One type of system aspires the air from atmosphere and discharges this air around the hull. The second system aspires the air from the air film around the hull and discharges it towards the rear of the hull and away from the keel. The power required to drive the blowers is less than the extra power required to drive the ship at the new maximum speed so that there is a net power saving.
FR7301220A 1973-01-15 1973-01-15 Method of reducing drag on ships hulls - layer of air around hull is formed from fresh air and air within layer Granted FR2230540A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
FR7301220A FR2230540A1 (en) 1973-01-15 1973-01-15 Method of reducing drag on ships hulls - layer of air around hull is formed from fresh air and air within layer
FR7307442A FR2230541A2 (en) 1973-01-15 1973-03-02 Drag reduction system for ship's hulls - uses large velocity gradient layer of air injected beneath hull
FR7313276A FR2283045A2 (en) 1973-01-15 1973-04-12 Drag reduction for hull of ship - using compressed air leaked through holes in side of keel
FR7325258A FR2236717A2 (en) 1973-01-15 1973-07-10 Ship hull resistance reduction process - distributes air under hull from assembly moving in and out from centre
FR7628152A FR2364809A2 (en) 1973-01-15 1976-09-20 Ship's hull designed to trap air cushion - has supply of air introduced to area defined by bulge keel to reduce resistance through water

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
FR7301220A FR2230540A1 (en) 1973-01-15 1973-01-15 Method of reducing drag on ships hulls - layer of air around hull is formed from fresh air and air within layer
FR7307442A FR2230541A2 (en) 1973-01-15 1973-03-02 Drag reduction system for ship's hulls - uses large velocity gradient layer of air injected beneath hull
FR7313276A FR2283045A2 (en) 1973-01-15 1973-04-12 Drag reduction for hull of ship - using compressed air leaked through holes in side of keel
FR7325258A FR2236717A2 (en) 1973-01-15 1973-07-10 Ship hull resistance reduction process - distributes air under hull from assembly moving in and out from centre
FR7628152A FR2364809A2 (en) 1973-01-15 1976-09-20 Ship's hull designed to trap air cushion - has supply of air introduced to area defined by bulge keel to reduce resistance through water

Publications (2)

Publication Number Publication Date
FR2230540A1 true FR2230540A1 (en) 1974-12-20
FR2230540B1 FR2230540B1 (en) 1977-02-11

Family

ID=61021871

Family Applications (5)

Application Number Title Priority Date Filing Date
FR7301220A Granted FR2230540A1 (en) 1973-01-15 1973-01-15 Method of reducing drag on ships hulls - layer of air around hull is formed from fresh air and air within layer
FR7307442A Granted FR2230541A2 (en) 1973-01-15 1973-03-02 Drag reduction system for ship's hulls - uses large velocity gradient layer of air injected beneath hull
FR7313276A Pending FR2283045A2 (en) 1973-01-15 1973-04-12 Drag reduction for hull of ship - using compressed air leaked through holes in side of keel
FR7325258A Granted FR2236717A2 (en) 1973-01-15 1973-07-10 Ship hull resistance reduction process - distributes air under hull from assembly moving in and out from centre
FR7628152A Granted FR2364809A2 (en) 1973-01-15 1976-09-20 Ship's hull designed to trap air cushion - has supply of air introduced to area defined by bulge keel to reduce resistance through water

Family Applications After (4)

Application Number Title Priority Date Filing Date
FR7307442A Granted FR2230541A2 (en) 1973-01-15 1973-03-02 Drag reduction system for ship's hulls - uses large velocity gradient layer of air injected beneath hull
FR7313276A Pending FR2283045A2 (en) 1973-01-15 1973-04-12 Drag reduction for hull of ship - using compressed air leaked through holes in side of keel
FR7325258A Granted FR2236717A2 (en) 1973-01-15 1973-07-10 Ship hull resistance reduction process - distributes air under hull from assembly moving in and out from centre
FR7628152A Granted FR2364809A2 (en) 1973-01-15 1976-09-20 Ship's hull designed to trap air cushion - has supply of air introduced to area defined by bulge keel to reduce resistance through water

Country Status (1)

Country Link
FR (5) FR2230540A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2607098A1 (en) * 1986-11-24 1988-05-27 Pingon Pierre De SURFACE EFFECT CATAMARAN
EP3290324A1 (en) * 2016-08-30 2018-03-07 Silverstream Technologies B.V. Dual cavity air lubrication system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2230540A1 (en) * 1973-01-15 1974-12-20 Fiacre Jean Marie Method of reducing drag on ships hulls - layer of air around hull is formed from fresh air and air within layer
US6092480A (en) * 1997-08-01 2000-07-25 Ishikawajima-Harima Heavy Industries Co., Ltd. Generation of bubbles for friction-reducing ship and method for reducing skin-friction

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3040688A (en) * 1957-11-07 1962-06-26 Gram Knud Fini Ship having an air cushion under the bottom
FR2230540A1 (en) * 1973-01-15 1974-12-20 Fiacre Jean Marie Method of reducing drag on ships hulls - layer of air around hull is formed from fresh air and air within layer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NEANT *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2607098A1 (en) * 1986-11-24 1988-05-27 Pingon Pierre De SURFACE EFFECT CATAMARAN
EP3290324A1 (en) * 2016-08-30 2018-03-07 Silverstream Technologies B.V. Dual cavity air lubrication system
WO2018044162A1 (en) * 2016-08-30 2018-03-08 Silverstream Technologies B.V. Dual cavity air lubrication system
CN109641637A (en) * 2016-08-30 2019-04-16 银流技术公司 Two-chamber air lubrication systems

Also Published As

Publication number Publication date
FR2283045A2 (en) 1976-03-26
FR2236717A2 (en) 1975-02-07
FR2364809A2 (en) 1978-04-14
FR2230541A2 (en) 1974-12-20
FR2230541B2 (en) 1977-08-05
FR2364809B1 (en) 1979-01-12
FR2236717B2 (en) 1977-12-23
FR2230540B1 (en) 1977-02-11

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Legal Events

Date Code Title Description
ST Notification of lapse