EP0289407A1 - Vom Flugzeug abzuwerfende Boje, insbesondere für Unterwasserbeobachtung - Google Patents

Vom Flugzeug abzuwerfende Boje, insbesondere für Unterwasserbeobachtung Download PDF

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Publication number
EP0289407A1
EP0289407A1 EP88400993A EP88400993A EP0289407A1 EP 0289407 A1 EP0289407 A1 EP 0289407A1 EP 88400993 A EP88400993 A EP 88400993A EP 88400993 A EP88400993 A EP 88400993A EP 0289407 A1 EP0289407 A1 EP 0289407A1
Authority
EP
European Patent Office
Prior art keywords
balloon
buoy
neck
water
air
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.)
Ceased
Application number
EP88400993A
Other languages
English (en)
French (fr)
Inventor
François Warnan
Joel Barbot
Claude Brochard
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.)
Thales SA
Original Assignee
Thomson CSF SA
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 Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0289407A1 publication Critical patent/EP0289407A1/de
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B22/00—Buoys
    • B63B22/003—Buoys adapted for being launched from an aircraft or water vehicle;, e.g. with brakes deployed in the water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B22/00—Buoys
    • B63B22/22—Inflatable buoys with gas generating means

Definitions

  • the present invention relates to buoys which are dropped from an aircraft on the surface of the sea, and more particularly to acoustic buoys provided with hydrophones making it possible to collect underwater noise and to transmit it by radioelectric means to a receiving station most often located in the drop aircraft.
  • buoys are known from the French invention patent No. 2,431,419 and from its addition No. 2,464,179 filed in the name of the applicant.
  • buoys include a device to brake and stabilize their fall in order to essentially limit the effects of shock during contact with water.
  • This device consists of a balloon, which also serves as a float for the buoy after it has entered the water.
  • a hydrophone located at the bottom of the buoy automatically descends to a determined depth when it floats on water. It collects the acoustic noises propagating in the water and transmits them to a radioelectric transmitter contained in the body of the buoy, which feeds an antenna supported by the balloon.
  • the balloon is folded back into the body of the buoy and inflates during the fall via a forced air inlet located at the top of the body of the buoy.
  • the lower end of the balloon is crimped onto a circular support surrounding the body of the buoy, to which it is held by radial spacers which delimit a circular space allowing the forced entry of air into the balloon.
  • the balloon is furthermore provided with pockets in its upper part, through which the air flows in to exit through smaller upper openings, which makes it possible to obtain aerodynamic stability of the assembly during the descent into the air.
  • This system for fixing the float ball to the body of the buoy by means of a circular support and crimping the ball on the outside of this support has a certain fragility. mechanical. Furthermore, the assembly is relatively complex, which entails fairly high production costs.
  • the invention proposes to fix the float ball on the body of the buoy by means of a set of halyards coming to be fixed inside the neck of the buoy. It also proposes to provide this neck with a flexible returnable sleeve which closes under the effect of water pressure the air inlet orifices in the balloon.
  • the buoy according to the invention represented in FIG. 1 comprises a body 100 suspended from a balloon 101. After the release the balloon is extracted from the body of the buoy and it is deployed under the effect of the air which enters through openings triangular 104 perforated on the upper part, called the neck, of the body of the buoy.
  • the balloon has a set of pockets 102, six for example, in which the air rushes through the wide lower part which is not fixed to the balloon and exits through the narrower upper part, itself not fixed to the balloon .
  • these pockets are given a length at least equal to half the height of the balloon and are preferably made to slightly exceed the equator line of the ball. This gives an effect similar to that of a parachute.
  • the surface of the balloon is delimited by a set of halyards 103 which start from its top and join its base by delimiting on the balloon a set of sectors. Fixing these halyards on the balloon is preferably common with that of the lateral edges of the pockets 102.
  • halyards consist for example of cords or fabric bands. They allow both to strengthen the balloon and to come and fix it to the neck of the buoy inside the latter. In this way the open lower part of the balloon enters the neck and is therefore not crimped around, which provides better mechanical strength of the assembly.
  • FIG. 2 shows what happens during the impact of the buoy on the surface of the water.
  • the balloon sinks into the water to a height that exceeds its equator. Under these conditions the balloon is compressed by the pressure of the water, as shown in an exaggerated manner in the figure, and part of the air escapes through the openings 104.
  • the buoy then rises to the surface , water enters the balloon to replace the air which has thus left and the buoyancy of the assembly is poor. It is then found that in many cases the buoy sinks.
  • a flexible sleeve is used, which during the descent lets the air pass, and after the impact on the surface of the water turns around to close off the air intake orifices.
  • Figure 3 a partial sectional view of a buoy provided with such a sleeve.
  • the left half of this figure represents the buoy during its descent into the atmosphere, and the right half represents it when it floats on the surface of the water.
  • a buoy weighing approximately 15 kg was produced, supported by a balloon with a capacity of 30 liters fitted with 6 descent stabilization pockets.
  • the neck had 6 triangular openings point down with a height of 50 mm for a width of 40 mm.
  • the height of the sleeve was approximately 120 mm. Under these conditions we could measure that it remained after the impact and the turning of the sleeve between 4 and 5 liters of water in the neck and the lower part of the balloon and that the percentage of failures of the buoys, that is to say the number of those that sank, was particularly low.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Toys (AREA)
EP88400993A 1987-04-29 1988-04-22 Vom Flugzeug abzuwerfende Boje, insbesondere für Unterwasserbeobachtung Ceased EP0289407A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8706102 1987-04-29
FR8706102A FR2614598B1 (fr) 1987-04-29 1987-04-29 Bouee aeroportable largable, notamment pour ecoute sous-marine

Publications (1)

Publication Number Publication Date
EP0289407A1 true EP0289407A1 (de) 1988-11-02

Family

ID=9350639

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88400993A Ceased EP0289407A1 (de) 1987-04-29 1988-04-22 Vom Flugzeug abzuwerfende Boje, insbesondere für Unterwasserbeobachtung

Country Status (3)

Country Link
US (1) US4861297A (de)
EP (1) EP0289407A1 (de)
FR (1) FR2614598B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2725684A1 (fr) * 1994-10-18 1996-04-19 Thomson Csf Bouee aeroportee largable
EP2708460A1 (de) * 2012-09-18 2014-03-19 Dcns Funktionelles System zum Luft-Wasser-Austausch, insbesondere als Unterwasser-Gegenmaßnahme, die insbesondere von einem Gebäude an der Oberfläche ausgelöst wird
FR3033314A1 (fr) * 2015-03-04 2016-09-09 Dcns Systeme de freinage et de stabilisation de la plongee d'un objet faisant naufrage

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2676725B1 (fr) * 1991-05-21 1998-01-09 Thomson Csf Treuil pour remorquage d'objets immerges.
FR2714663B1 (fr) * 1993-12-30 1996-01-26 Thomson Csf Treuil à moteur hydraulique, notamment pour hélicoptère muni d'un sonar.
FR2735645B1 (fr) * 1995-06-16 1997-07-25 Thomson Csf Emetteur acoustique remorque
US8771634B1 (en) 2010-07-13 2014-07-08 The United States Of America As Represented By The Secretary Of The Navy Generation of hydrogen gas from a borohydride at a constant temperature using the phase transition of a hydrate
US8240602B1 (en) 2010-07-13 2012-08-14 The United States Of America As Represented By The Secretary Of The Navy Subsea deployment of aerial payloads utilizing long-term storage of lighter than air gases
RU2520985C2 (ru) * 2011-10-31 2014-06-27 Федеральное государственное военное образовательное учреждение высшего профессионального образования "Военный учебно-научный центр Военно-Морского Флота "Военно-морская академия им. Адмирала Флота Советского Союза Н.Г. Кузнецова" Способ подачи сигналов об аварии подо льдом с помощью гидроакустического сигнализатора и устройство для его осуществления

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3161896A (en) * 1963-11-20 1964-12-22 Ira T Holt Ram air inflated flotation bag
US3992736A (en) * 1975-12-22 1976-11-23 The United States Of America As Represented By The Secretary Of The Navy Expandable element check valve
EP0007830A1 (de) * 1978-07-18 1980-02-06 Thomson-Csf Vom Flugzeug abzuwerfende Boje

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3889224A (en) * 1974-03-08 1975-06-10 Us Navy Crown float/decelerator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3161896A (en) * 1963-11-20 1964-12-22 Ira T Holt Ram air inflated flotation bag
US3992736A (en) * 1975-12-22 1976-11-23 The United States Of America As Represented By The Secretary Of The Navy Expandable element check valve
EP0007830A1 (de) * 1978-07-18 1980-02-06 Thomson-Csf Vom Flugzeug abzuwerfende Boje

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2725684A1 (fr) * 1994-10-18 1996-04-19 Thomson Csf Bouee aeroportee largable
WO1996011837A1 (fr) * 1994-10-18 1996-04-25 Thomson-Csf Bouee aeroportee largable
AU693274B2 (en) * 1994-10-18 1998-06-25 Thomson-Csf Air-droppable buoy
EP2708460A1 (de) * 2012-09-18 2014-03-19 Dcns Funktionelles System zum Luft-Wasser-Austausch, insbesondere als Unterwasser-Gegenmaßnahme, die insbesondere von einem Gebäude an der Oberfläche ausgelöst wird
FR2995588A1 (fr) * 2012-09-18 2014-03-21 Dcns Systeme fonctionnel a changement de milieu air/eau tel que notamment de contre mesure sous marine destine a etre lance notamment a partir d'un batiment de surface
FR3033314A1 (fr) * 2015-03-04 2016-09-09 Dcns Systeme de freinage et de stabilisation de la plongee d'un objet faisant naufrage

Also Published As

Publication number Publication date
FR2614598A1 (fr) 1988-11-04
FR2614598B1 (fr) 1989-06-09
US4861297A (en) 1989-08-29

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