DE2642341A1 - Surface friction reduction for inflatable boats - uses air film between hull and water drawn under by hull contour - Google Patents

Surface friction reduction for inflatable boats - uses air film between hull and water drawn under by hull contour

Info

Publication number
DE2642341A1
DE2642341A1 DE19762642341 DE2642341A DE2642341A1 DE 2642341 A1 DE2642341 A1 DE 2642341A1 DE 19762642341 DE19762642341 DE 19762642341 DE 2642341 A DE2642341 A DE 2642341A DE 2642341 A1 DE2642341 A1 DE 2642341A1
Authority
DE
Germany
Prior art keywords
hull
air
water
boat
surface friction
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Withdrawn
Application number
DE19762642341
Other languages
German (de)
Inventor
Uwe Ing Grad Heidtmann
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE19762642341 priority Critical patent/DE2642341A1/en
Publication of DE2642341A1 publication Critical patent/DE2642341A1/en
Withdrawn legal-status Critical Current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 
    • B63B7/00—Collapsible, foldable, inflatable or like vessels
    • B63B7/06—Collapsible, foldable, inflatable or like vessels having parts of non-rigid material
    • B63B7/08—Inflatable
    • 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

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)

Abstract

The surface friction reducing, wake improving arrangement for inflatable boats functions by establishing an air film between hull and water. The air may be drawn to the hull/water interfere by the depression created there by hull movement through the water or may be fed down under pressure. In the case of an inflatable, a slot (7) for air flow is created between the transom board (4), located forward of the sidewall ends (6), and an appropriately shaped attached buoyand body (1) enclosing the cockpit space (2) and carrying the steering gear (3).

Description

Bett.:.Bed.:.

"Vorrichtung zur Verringerung des Reibirgswiderstandes an Bootskörpern und Verbesserung des Wasserablaufes am Bootsheck, insbesondere auch bei Schlauchhooten" Dem Stand der Technik entspricht, daß Boote ohne Tragflügelsystem bei Fahrzustand im Unterwasserteil vollkommen benetzt sind."Device for reducing the frictional resistance on boat hulls and improvement of the water drainage at the stern of the boat, especially with inflatable boats " According to the state of the art, boats without a hydrofoil system when in motion are completely wetted in the underwater part.

Zur Verringerung des Reibungswiderstandes kann eine dünne Luftschicht zwischen Wasser und Bootskörper beitragen. Diese Luftschicht zwischen Bootskörper und Wasser trägt gleichzeitig zu einem verbesserten Wasserablauf im Heckbereich des Bootes bei. Dies wird erfindungsgemäß dadurch erreicht, daß Luft durch geeignet geformte Luftschlitze im Bootsboden, die über Luftkanäle aus dem Bereich des Bootsraumes oberhalb der Wasserlinie mit Luft versorgt werden, eingebracht wird.A thin layer of air can be used to reduce the frictional resistance contribute between the water and the hull. This layer of air between the hull and water at the same time contributes to improved water drainage in the rear area of the boat. This is achieved according to the invention in that air is suitably passed through Shaped air slots in the bottom of the boat, which via air ducts from the area of the boat room are supplied with air above the waterline, is introduced.

Die Luft (3) kann durch den im Fahrzustand an den Luftschlitzen entstehenden Unterdruck zwischen Bootskörper und Wasser gesaugt werden, oder durch Gebläse eingeblasen werden. Die Anordnung der Luftkanäle kann wie in Figur 1 dargestellt jedoch immer unter der Wasserlinie (4) erfolgen.The air (3) can develop through the air slots when driving Vacuum can be sucked in between the hull and the water, or blown in by a blower will. However, the arrangement of the air ducts can always be as shown in FIG take place under the waterline (4).

Die Luftschlitze (1) und die Kanäle (2) lassen sich z.B. in Schottwänden unterbringen, die je nach Bootsform- und Verwendung im Vorschiffsbereich oder im EIeckteil liegen können.The air slots (1) and the channels (2) can be used in bulkheads, for example accommodate which, depending on the shape and use of the boat, in the fore section or in the Corner part can lie.

In Figur 2 ist die spezielle Anwendung der Erfindung für Schlauchboote dargestellt. Hier wird zwischen die Schlauchenden (6) des Schlauchbootes (5) ein schwimmfähiger Körper (1) so eingebaut und geeignet befestigt, daß zwischen dem Bootsspiegel (4) und Körper (1) ein schmaler Luftspalt (7) entsteht, durch den Luft zwischen Unte rwasserteil des angebauten Körper (1) und das Wasser gesaugt wird. Dieser Körper kann z.B. aus Schaumstoffen, einem Hohlblaskörper aus Kunststoff, oder einer GFK-Konstruktion,oder einer Werkstoffkombination bestehen, und gleichzeitig einen abschließbaren Stauraum (2) beinhalten. Am Ende des Körpers (1), der sich eng an die Konturen des Schlauchbootes in Längsrichtung anschließt, kann die Ruderanlage (3) angehängt werden.In Figure 2 is the specific application of the invention for inflatable boats shown. Here is a between the hose ends (6) of the inflatable boat (5) buoyant body (1) installed and appropriately attached that between the Boat transom (4) and body (1) a narrow air gap (7) is created through which air between the lower part of the built-on body (1) and the water is sucked in. This body can, for example, be made of foam, a hollow blown body made of plastic, or a GRP construction, or a combination of materials, and at the same time include a lockable storage space (2). At the end of the body (1) that is closely to the contours of the dinghy in the longitudinal direction, the rowing system can (3) can be appended.

Figur 3 zeigt einen Körper (1), der z.B. für Schlauchboote die Möglichkeit bietet den die Reibung zwischen Wasser und Bootskörper vermindernden Luftspalt zu erreichen. indem der Körper mit geeigneter Schiffsbugform dem Boot (2) angepaßt wird. Zwei Dichtleisten (3) aus elastischem Material begrenzen den Luftspalt zu den Außenseiten des Bootes.Figure 3 shows a body (1) that can be used, for example, for inflatable boats provides the air gap that reduces the friction between the water and the hull reach. by adapting the body to the boat (2) with a suitable bow shape will. Two sealing strips (3) made of elastic material limit the air gap the outside of the boat.

Claims (6)

Patentansp rüche 1. Dadurch gekennzeichnet, daß über Luftschlitze in einem Bootsboden über Luftkanäle Luft zwischen Bootsboden und Wasser ini Unterwasserteil des Bootes durch Unterdruck an den Luftschlitzen, oder durch Gebläse eingeführt wird, und damit die Reibung zwischen I3notsbocieii un(l Wasser vermindert und der Wasserablauf am IIeck verbessert wird.Patent claims 1. Characterized in that air slots in the bottom of a boat through air ducts air between the bottom of the boat and the water in the underwater part of the boat by negative pressure on the louvers, or introduced by a fan is, and with it the friction between I3notsbocieii un (l water and the Water drainage at the IIeck is improved. 2. Daß ein aus Schaumstoffen bestehender schwimmfähiger Körper zwischen die finden eines Schlauchbootes eingesetzt und in geeigneter Weise befestigt wird, so daß zwischen dem Spiegel des Bootes und dem Körper ein Luftspalt entsteht, über den Luft zwischen den Unterwasserteil des Körpers und dem Wasser Luft eingesaugt wird.2. That a buoyant body made of foams between find a dinghy used and attached in a suitable manner, so that there is an air gap between the mirror of the boat and the body, about the air sucked in between the underwater part of the body and the water air will. 3. Daß der Schwimmkörper aus Schaumstoffen, Holz, als Ilohlbiaskc> ;)er, als GFK-Konstruktion, oder einer Kombination verschiedener Materialien bestehen kann.3. That the float is made of foam, wood, as Ilohlbiaskc> ;) it consists of a GRP construction or a combination of different materials can. 4. Daß der Körper gleichzeitig einen abschließbaren oder offenen Stauraum enthalten kann.4. That the body also has a lockable or open storage space may contain. 5. Daß an den Körper die Ruderaniage des Bootes angehängt werden kann.5. That the rudder system of the boat can be attached to the body. 6. Dadurch gekennzeichnet, daß ein geeignet geformter Körper vor dem Bug des Schlauchbootes zusätzlich zum Heckteil angesetzt werden kann, der ebenfalls Luft zwischen Unterwasserteil des Bootes und den Wasser einführt.6. Characterized in that a suitably shaped body before The bow of the dinghy can also be attached to the stern part, which is also Introduces air between the underwater part of the boat and the water.
DE19762642341 1976-09-21 1976-09-21 Surface friction reduction for inflatable boats - uses air film between hull and water drawn under by hull contour Withdrawn DE2642341A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19762642341 DE2642341A1 (en) 1976-09-21 1976-09-21 Surface friction reduction for inflatable boats - uses air film between hull and water drawn under by hull contour

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19762642341 DE2642341A1 (en) 1976-09-21 1976-09-21 Surface friction reduction for inflatable boats - uses air film between hull and water drawn under by hull contour

Publications (1)

Publication Number Publication Date
DE2642341A1 true DE2642341A1 (en) 1978-03-23

Family

ID=5988409

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19762642341 Withdrawn DE2642341A1 (en) 1976-09-21 1976-09-21 Surface friction reduction for inflatable boats - uses air film between hull and water drawn under by hull contour

Country Status (1)

Country Link
DE (1) DE2642341A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2450738A1 (en) * 1979-03-06 1980-10-03 Lundkvist Ake Sides and bottom union for sliding ship's hull - allows air passage through and out under hull
WO1984001338A1 (en) * 1982-10-06 1984-04-12 Manche Atel Chantiers Fast boat

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2450738A1 (en) * 1979-03-06 1980-10-03 Lundkvist Ake Sides and bottom union for sliding ship's hull - allows air passage through and out under hull
WO1984001338A1 (en) * 1982-10-06 1984-04-12 Manche Atel Chantiers Fast boat
FR2534221A2 (en) * 1982-10-06 1984-04-13 Manche Atel Chantiers DEVICE FOR PROPULSION AND DIRECTION OF A SHIP
EP0105819A1 (en) * 1982-10-06 1984-04-18 Groupement D'etudes Et De Recherches Navales (G.E.R.N.) Fast boat

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