US3342154A - Boats - Google Patents

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Publication number
US3342154A
US3342154A US525013A US52501366A US3342154A US 3342154 A US3342154 A US 3342154A US 525013 A US525013 A US 525013A US 52501366 A US52501366 A US 52501366A US 3342154 A US3342154 A US 3342154A
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US
United States
Prior art keywords
boat
hull
coffers
water
keel
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 - Lifetime
Application number
US525013A
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English (en)
Inventor
Marec Francois Henri Marie Le
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NAVILI SARL
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NAVILI SARL
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Publication date
Application filed by NAVILI SARL filed Critical NAVILI SARL
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Publication of US3342154A publication Critical patent/US3342154A/en
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    • 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
    • B63B1/18—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving additional lift from hydrodynamic forces of hydroplane type
    • B63B1/20—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving additional lift from hydrodynamic forces of hydroplane type having more than one planing surface

Definitions

  • ABSTRACT OF THE DISCLOSURE A boat hull in catamaran form provided at the stern with two spaced-apart coffers projecting from the main body of the hull and having keels positioned below the main body, to enable the boat to fioat mainly or solely on the two coffers, particularly at high speeds.
  • the present invention concerns a boat with improved stability and ease in handling and with various other improvements in relation to boats of known types.
  • catamaran shape of part of the hull of the boat.
  • the word catamaran will hereinafter be used to refer to a hull shape which defines, with at least certain water levels, several separate oating zones extending parallel with the length of the boat and located side by side.
  • the present invention envisages means of obviating or reducing the above disadvantages and to this end proposes a catamaran hull comprising two rear coffers which, behind and on both sides of the propellor, form prolongations of two separate floating zones formed over the rest of the hull.
  • the two separate float, ing zones are gradually resorbed or readsorbed from the front asthe boat is gradually lifted up by speed at which -it is travelling; thus, the relative size of the immerged portions to the rear of the propellor increases gradually and without interruption.
  • the boat may further comprise a floating zonelocated in the longitudinal axis and arranged so that it too iSI gradually resorbed from front to rear.
  • the separate floating zones thus arranged form one or more tunnels. As these are partly filled with air they are particularly well suited to receive and channel back any water displaced at the bows. This water empties into a space partly bounded by the rear coffers and it contributes to the satisfactory feeding of the propellor.
  • FIG. 1 is a longitudinal profile of the boat
  • FIG. 2 is a view from below with water lines 11, 12 and 13;
  • FIG. 3 is a view Ifrom above
  • FIGS. 4 and S are cross sections
  • FIG. 6 is a perspective view.
  • the boat according to the invention is made up of a monocoque unit 1 extending from the prow 2 to an intermediate board 3, and two coffers 4 and 5 coupled to the board 3.
  • the end partitions 6 and 7 of the coffers 4 and 5 form the rear board of the construction.
  • the monocoque unit 1 has two differently shaped portions.
  • the front portion associated with the stem 8, extends from the prow 2 to a point in the vicinity of the cross sectional plane IV.
  • the shape of this front portion 1 is shown by the profile in sectional plane Il shown in FIG. 44.
  • the hull consists, on both sides of the stem 8, of planking 9 which rises continuously from the stem to the edge 10 of the deck.
  • the shape of the rear portion 1B of the monocoque unit 1 generally follows the arrangement shown in sectional plane VI in FIG. 4. That is to say, on each side of the keel 11 the hull has a bottom 12 with the profile of an upwardly curved arch which redescends to join the planking 13 by means of abilge keel14; the top of the arch 12 is thus at a higher level than the keel 14, and can escape some water level; it therefore allows the rear portion 1b to rest on two lateral floating zones extending
  • the planking 13 has a projecting longitudinal ridge shown at 15 in FIG. 1, thus producing a break in the transverse profile in sectional plane VI in FIG. 4; the portion 13a of the planking located labove the breaking point 15 is concave over its external surface, thus backing 0E from the lower portion of the planking shown at 13b.
  • the bilge keels 14 extend to in front of the sectional plane III to form two lateral stems in the bows region 1a; these are complementary to the stem 8 and connected thereto by concave hull planking shown at 16 in cross sectional planes II and IV. This permits a gradual transition between the two types of profile, exemplified by sectional planes II and VI.
  • FIG. 1 also shows that the bilge lkeels 14 drop below ⁇ the keel 11 from an intermediate point thereon in the catamaran.
  • the space between these two coffers is occupied by a motor 17 mounted on the board 3.
  • the propellor 18 is in front of the rear board 6 to 7.
  • the embodiment just described makes it possible to concentrate the oating zones at points widely spaced from the hull. Once the boat has sewn up by the action of the speed and the force of the wind on its stem, it rests solely or almost entirely on two widely spaced rear skids formed by the keel portions 14 associated with the stern coffers. The result is that only a small surface is wetted and that the boat has an excellent posture as well as good speed and stability when tacking.
  • the boat drops back on to a 3 point hull, the third point of support or skid being provided by the central keel.
  • Transmission from the 3 point hull to the 2 point hull is made smoothly, by total resorption of the central supporting zone, taking place progressively from front to rear, and accompanied by partial resorption of the two lateral supporting zones in the same direction. Moreover lengthwise resorption of the central zone is attended by a simultaneous gradual reduction of its width. Transition from the 3V point to the 2 point support thus takes place without any abrupt change. This gradual resorption of the supporting zones is enhanced by any tendency of the boat to tilt upwards from back to front relatively to the horizontal.
  • the inclination of the bilge keels makes it possible to attack the water level at an angle and this can be done as soon as the boat has cast off. Casting of is made easier, and the gradual attack by the bilge keels allows for very good acceleration and easy gliding.
  • the inclination of the bilge keels makes it possible to form catamaran elements whose section gradually increases towards the rear starting from zero.
  • the various catamaran elements are interconnected, at least at a part of their length, by higher portions with an arched profile. These form longitudinal tunnels which allow air and water to escape to the stern.
  • the stability of the boat is considerably increased in the face of wind and water thrusts; besides, only a small amount of water is forced back onto the sides and resistance to the forward movement is thereby reduced.
  • the water which is forced back sideways shows no tendency to come on board, for it can easily leave the hull as a result of the backing off at the top of the latter.
  • the air discharge provided at the stern enables the stem to behave like a supporting fin or blade and the whole shape according to the invention may usefully be applied to hydroplanes.
  • the provision of specific discharge points for air and water reduces drag and turbulence which may tend to slow down the boat.
  • the mounting of the motor, in a recess provided at the rear of the hull, has various advantages.
  • the fact that the motor is in a forward position relatively to the rear board enables the weight of the motor to stabilise the boat and to help it to resume its normal position once it has sewn up to the point where it rests only on its rear board.
  • the motor is in a forward position makes it possible to reduce the distance between the propellor and the sliding skids to the rear and consequently to shorten the turns when going about.
  • the position chosen for the motor may be such that the propellor is right in front of the boat portions which are submerged when the boat reaches high speeds; this produces an effect similar to that produced by yfront wheel drive in land vehicles, with the advantages of improved stability when travelling in a straight line and increased safety when turning.
  • the invention has been described in its application to a motor boat but it may usefully be applied to boats of other types, for example to storm spankers.
  • the submerged parts of the two bilge keels may be extended forwards to allow the storm spanker to bear on only one larger side skid instead of on two short stern skids.
  • the monocoque unit may be replaced by any equivalent unit operating as a catamaran, for example by a plurality of parallel coffers joined by diaphragms of arcuate profile to form tunnels for the discharge of air and water, the diaphragms being connected in front to a V-shaped fin or blade designed to reduce air resistance and possibly to lift up the boat.
  • a boat hull comprising one main body and two spaced-apart coffers projecting from the rear of said main body, said main body having a central keel and two bilge keels, said coffers having two respective keel portions extending from said bilge keels and positioned below said central keel.
  • a boat according to claim 1 having a stern extending from the central keel.
  • a boat according to claim 1 having a stern extending farther forward than the bilge keels.
  • each side of the hull defines a ridge, located intermediate the corresponding bilge keel and deck line.
  • a boat according to claim 1 and a propeller located between the coffers and in front ofthe rear ends thereof.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Toys (AREA)
  • Earth Drilling (AREA)
US525013A 1965-02-08 1966-02-04 Boats Expired - Lifetime US3342154A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR4697A FR1432674A (fr) 1965-02-08 1965-02-08 Bateau

Publications (1)

Publication Number Publication Date
US3342154A true US3342154A (en) 1967-09-19

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ID=8570295

Family Applications (1)

Application Number Title Priority Date Filing Date
US525013A Expired - Lifetime US3342154A (en) 1965-02-08 1966-02-04 Boats

Country Status (6)

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US (1) US3342154A (cs)
BE (1) BE675383A (cs)
ES (1) ES322735A1 (cs)
FR (1) FR1432674A (cs)
GB (1) GB1106441A (cs)
NL (1) NL6601535A (cs)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4492176A (en) * 1982-01-04 1985-01-08 Arima Marine International, Inc. Boat hull
US6203389B1 (en) * 1999-08-24 2001-03-20 Eric Todd Pearson Bodyboard
EP1182126A1 (en) * 2000-08-18 2002-02-27 David R. Craig Boat hull
ES2223203A1 (es) * 2001-07-19 2005-02-16 Tecnicas Del Poliester Gm, S.L. Casco perfeccionado para embarcaciones.
WO2005028294A1 (en) * 2003-09-24 2005-03-31 Janine Massoni A water board
WO2005115775A1 (en) * 2004-05-24 2005-12-08 Gibbs Technologies Limited An amphibious vehicle
ITMI20081240A1 (it) * 2008-07-09 2010-01-10 Ferretti Spa Scafo per imbarcazione con caratteristiche di scafo dislocante e di scafo planante
US9238499B1 (en) 2015-04-01 2016-01-19 3Madmen Wakesurfing boat

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2442176A1 (fr) * 1978-11-24 1980-06-20 Goulley Michel Bateau de type catamaran a etrave centrale
FR2478570A1 (fr) * 1980-03-21 1981-09-25 Nguyen Manh Embarcation notamment a voile
US4672905A (en) * 1984-11-28 1987-06-16 Pipkorn Howard W Boat hull with center V-hull and sponsons
FR2597825A1 (fr) * 1986-04-29 1987-10-30 Caudart Alphonse Carene de bateau et equipement interieur d'un tel bateau
IT212310Z2 (it) * 1987-07-01 1989-07-04 Akzo Srl Scafo per imbarcazione a vela
US4907520A (en) * 1988-06-01 1990-03-13 Pipkorn Howard W High performance boat hull with anti-spin sponson
GB9325762D0 (en) * 1993-12-16 1994-02-23 Paragon Mann Ltd Boat
CN1044991C (zh) * 1994-08-13 1999-09-08 陈振诚 水面航行器船体
EP0775626B1 (en) * 1994-08-13 2002-06-12 Zhencheng Chen Planing vessel
FR2806696A1 (fr) * 2000-03-24 2001-09-28 Jean Claude Bouvier Carene evolutive pour bateau a moteur

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1794898A (en) * 1928-06-19 1931-03-03 Hillmann Hermann Float for hydroplanes, flying boats, and the like
DE532611C (de) * 1928-06-20 1931-09-01 Hermann Hillmann Schwimmkoerper fuer Wasserfahrzeuge
FR954423A (fr) * 1947-09-29 1949-12-26 Bateau
US3135976A (en) * 1962-08-15 1964-06-09 Winters Henry Boat hull

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1794898A (en) * 1928-06-19 1931-03-03 Hillmann Hermann Float for hydroplanes, flying boats, and the like
DE532611C (de) * 1928-06-20 1931-09-01 Hermann Hillmann Schwimmkoerper fuer Wasserfahrzeuge
FR954423A (fr) * 1947-09-29 1949-12-26 Bateau
US3135976A (en) * 1962-08-15 1964-06-09 Winters Henry Boat hull

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4492176A (en) * 1982-01-04 1985-01-08 Arima Marine International, Inc. Boat hull
US6203389B1 (en) * 1999-08-24 2001-03-20 Eric Todd Pearson Bodyboard
US6546890B1 (en) 2000-08-18 2003-04-15 David R. Craig Boat hull
EP1182126A1 (en) * 2000-08-18 2002-02-27 David R. Craig Boat hull
CN1318260C (zh) * 2001-03-13 2007-05-30 埃里克·托德·皮尔逊 滑浪板
WO2002072412A1 (en) * 2001-03-13 2002-09-19 Pearson Eric T Bodyboard
ES2223203A1 (es) * 2001-07-19 2005-02-16 Tecnicas Del Poliester Gm, S.L. Casco perfeccionado para embarcaciones.
WO2005028294A1 (en) * 2003-09-24 2005-03-31 Janine Massoni A water board
WO2005115775A1 (en) * 2004-05-24 2005-12-08 Gibbs Technologies Limited An amphibious vehicle
GB2429437A (en) * 2004-05-24 2007-02-28 Gibbs Tech Ltd An amphibious vehicle
US20080026650A1 (en) * 2004-05-24 2008-01-31 Roycroft Terrance J Amphibious Vehicle
GB2429437B (en) * 2004-05-24 2008-05-07 Gibbs Tech Ltd Amphibious vehicle with v hull sections
ITMI20081240A1 (it) * 2008-07-09 2010-01-10 Ferretti Spa Scafo per imbarcazione con caratteristiche di scafo dislocante e di scafo planante
US9238499B1 (en) 2015-04-01 2016-01-19 3Madmen Wakesurfing boat
US9242700B1 (en) 2015-04-01 2016-01-26 3Madmen Wakesurfing boat

Also Published As

Publication number Publication date
ES322735A1 (es) 1966-08-01
BE675383A (cs) 1966-05-16
FR1432674A (fr) 1966-03-25
NL6601535A (cs) 1966-08-09
GB1106441A (en) 1968-03-20

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