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Patent Searching and Data


Title:
HULLS FOR PLANING AND SEMI-PLANING CRAFT
Document Type and Number:
WIPO Patent Application WO/2000/053486
Kind Code:
A2
Abstract:
This disclosure relates to hulls for planing or semi-planing water craft. The hull (4) has an abruptly down-swept trailing edge portion (18) which, in the preferred embodiment, is in the form of a flap (18) extending across the full width of the transom of the hull and which projects beyond the level of an upswept portion of the underside (14) of the hull by flap chord (Cf) representing only a small fraction of the length (L) of the hull (4). According to another aspect of the invention, a hull (4) having a lightly cambered nose portion (5, 10, 12) is also described.

Inventors:
DUNCAN IAN JAMES (GB)
Application Number:
PCT/GB2000/000864
Publication Date:
September 14, 2000
Filing Date:
March 09, 2000
Export Citation:
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Assignee:
DUNCAN IAN JAMES (GB)
International Classes:
B63B1/18; B63B39/06; (IPC1-7): B63B1/00
Domestic Patent References:
WO1996020106A11996-07-04
WO1996020105A11996-07-04
WO1999055577A11999-11-04
WO1999044885A11999-09-10
Foreign References:
US5806455A1998-09-15
US5215029A1993-06-01
EP0071763A11983-02-16
Attorney, Agent or Firm:
GILL JENNINGS & EVERY (Broadgate House 7 Eldon Street London EC2M 7LH, GB)
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Claims:
CLAIMS
1. A hull (4) for planing or semiplaning water craft, the hull having an abruptly downswept trailing edge portion (18).
2. A hull according to claim 1, wherein said trailing edge portion (18) is integrally formed in the hull.
3. A hull according to claim 1, wherein said trailing edge portion is provided in the form of a flap means (18) projecting generally downwardly from the hull (4).
4. A hull according to claim 3, wherein said flap means (18) is angled at less than 45 degrees to the normal to the design water plane (8).
5. A hull according to claim 3, wherein said flap means is substantially normal to the design water plane.
6. A hull according to any of claims 3 to 5, wherein the flap means (18) extends across the full width of the transom of the hull.
7. A hull according to any of claims 3 to 6, wherein the angle (ß) of the flap means (18) is fixed.
8. A hull according to any of claims 3 to 6, wherein the angle (ß) of the flap means (18) is variable.
9. A hull according to any of claims 3 to 8, wherein the flap means (18) projects beyond the level of a portion (15) of the underside of the hull immediately adjacent to the flap means, by a chord (CF) which is less than 1% of the full length (L) of the hull (4). <BR> <BR> <BR> <BR> <BR> <BR> <P>10.
10. A hull according to claim 9, wherein the chord (CF) of the flap means (18) can be varied by sliding the flap means upwardly or downwardly along an inclined axis on which the flap means is slidably mounted.
11. A hull according to claim 10, wherein at least one of mechanical, electrical and hydraulic means is provided for controlling this movement of the flap means (18).
12. A hull (4) for a planing or semiplaning water craft, the hull having a nose portion and a trailing edge portion, wherein the nose portion comprises a forward surface (5,10, 12) extending rearwardly and downwardly from a nose of the hull towards the trailing edge portion, which forward surface is lightly cambered such that, in longitudinal section of the hull, the angle (a) of said forward surface relative to the water plane, in use of the hull, is progressively reduced along the length of said nose portion.
13. A hull according to claim 12, wherein the lightly cambered nose portion (5,10,12) blends smoothly into a rear portion (14) of the underside of the hull which is normally immersed when the hull (4) is moving at its designed operating speed.
14. A hull according to claim 13, wherein this rear portion (14) of the underside of the trailing edge portion is also cambered such that the angle of incidence (onc3) of said underside relative to the design water plane (8), at the point (13) where the underside meets the forward surface (10) of the nose portion at the design water plane, in longitudinal section of the hull, is less than two degrees.
15. A hull according to claim 14, wherein said angle of <BR> <BR> <BR> <BR> incidence (a3) of said underside relative to the design water plane is less than or equal to one degree.
16. A hull according to any of claims 12 to 15, wherein the cambered surface (14) of the normally immersed underside blends smoothly into a generally upswept trailing portion of the underside.
17. A hull according to claim 16, wherein said upswept trailing portion of the underside is inclined to the design <BR> <BR> <BR> <BR> water plane (8), in use of the hull, at an angle (OWE) which is dependent on the type of craft in which the hull (4) is incorporated, and the design speed and load conditions of the hull.
18. A hull according to claim 16, wherein said upswept trailing portion of the underside is inclined to the design <BR> <BR> <BR> <BR> water plane (8), in use of the hull, at an angle (OWE) which is in the range of1 degree to +1 degree.
19. A hull according to any of claims 1 to 11, wherein the hull (4) further includes a nose portion comprising a forward surface (5) extending rearwardly and downwardly from a nose of the hull towards said trailing edge portion (18), which forward surface is lightly cambered such that, in longitudinal section of the hull, the angle (a) of said forward surface relative to the water plane, in use of the hull, is progressively reduced along the length of said nose portion.
20. A hull according to claim 19, wherein the cambered surface of the normally immersed underside blends smoothly into a generally upswept trailing portion of the underside, and said upswept trailing portion is immediately forward of the abruptly downswept trailing edge portion (18) of the hull.
21. A hull for planing or semiplaning water craft, wherein, in longitudinal section of the hull, the length of the immersed section (chord C1) of the length (L) of the hull, in use of the hull under design conditions, is less than one tenth the total length (L) of the hull.
22. A water craft incorporating a hull (4) according to any of claims 1 to 21.
Description:
INTERNATIONALSEARCHREPORT lnt,tionalApplicationNo PCT/GB00/00864 C.(Continuation)DOCUMENTSCONSIDEREDTOBERELEVANT CategoryCitationofdocument,withindication,whereappropriate,o ftherelevantpassagesRelevanttoclaimNo. XWO9620105A(MARINETECHNOLOGYDEVLTD;1,3-7, PAVLOVSTANISLAVDETAL)9-11,22 4July1996(1996-07-04) claim12;figures1-5 page3,line19-page4,line3 page4,line29-page5,line37 X,PWO9955577A(PROFJORDAB;OLOFSSONBO)1,3-5,7, 4November1999(1999-11-04)9,22 A10,11 figures1-4 page1,line10-line33 X,PWO9944885A(BJOERNSVENSSONMARINE1,3-5, CONSULTAB;SVENSSONBJOERN)7-9,22 10September1999(1999-09-10) A10,11 abstract;claim1;figures2,3A,3B page10,line1-line5 AGB2069953A(STAINLESSSTEEL1,2,7,22 DISTRIBUTORSLTD) 3September1981(1981-09-03) abstract 1 a,.. ernationalapplicationNo. INTERNATIONALSEARCHREPORTPCT/GB00/00864 Box IObservationswherecertainclaimswerefoundunsearchable(Continu ationofitem1offirstsheet) ThisInternationalSearchReporthasnotbeenestablishedinrespecto fcertainclaimsunderArticle17(2)(a)forthefollowingreasons: 1.ClaimsNos.: becausetheyrelatetosubjectmatternotrequiredtobesearchedbythi sAuthority,namely: 2.ClaimsNos.: becausetheyrelatetopartsoftheInternationalApplicationthatdon otcomplywiththeprescribedrequirementstosuch anextentthatnomeaningfulInternationalSearchcanbecarriedout,s pecifically: 3.gClaimsNos.: becausetheyaredependentclaimsandarenotdraftedinaccordancewit hthesecondandthirdsentencesofRule6.4(a). Box11Observationswhereunityofinventionislacking(Continuation ofitem2offirstsheet) ThisInternationalSearchingAuthorityfoundmultipleinventionsin thisinternationalapplication,asfollows: 1.As allrequiredadditionalsearchfeesweretimelypaidbytheapplicant, thisInternationalSearchReportcoversall searchableclaims. 2.As aitsearchableclaimscouldbesearchedwithouteffortjustifyingana dditionalfee,thisAuthoritydidnotinvitepayment ofanyadditionalfee. 3. As on ! ysomeoftherequiredadditionalsearchfeesweretimelypaidbytheapp licant,thisInternationalSearchReport coversonlythoseclaimsforwhichfeeswerepaid,specificallyclaims Nos.: 4.1 Norequiredadditionalsearchfeesweretimelypaidbytheapplicant.C onsequently,thisInternationalSearchReportis restrictedtotheinventionfirstmentionedintheclaims;itiscovere dbyclaimsNos.: 1-11,19,20,21,22 RemarkonProtestThe additionalsearchfeeswereaccompaniedbytheapplicant'sprotest. g Noprotestaccompaniedthepaymentofadditionalsearchfees. INTERNATIONALSEARCHREPORT Int tional ApplicationNo Informationonpatentfamily members PCT/GB 00/00864 PCT/GB00/00864 PatentdocumentPublicationPatentfamilyPublication citedinsearchreportdatemember(s)date WO9620106A04-07-1996SE502859C05-02-1996 AU693985B09-07-1998 AU4361896A19-07-1996 EP0794892A17-09-1997 NO972939A23-06-1997 SE9404503A05-02-1996 US3584590A15-06-1971NONE WO9620105A04-07-1996SE502671C04-12-1995 AU4361796A19-07-1996 SE9404502A04-12-1995 WO9955577A04-11-1999US6006689A28-12-1999 AU4401499A16-11-1999 WO9944885A10-09-1999AU2755099A20-09-1999 SE9800643A03-09-1999 GB2069953A03-09-1981NONE