US3040687A

US3040687A - Boat bottom

Info

Publication number: US3040687A
Application number: US754308A
Authority: US
Inventors: George O Huet
Original assignee: Higgins Inc
Current assignee: Higgins Inc
Priority date: 1958-08-11
Filing date: 1958-08-11
Publication date: 1962-06-26
Anticipated expiration: 1979-06-26

Description

June 26, 1962 BOAT BOTTOM Filed Aug. 11, 1958 2 Sheets-Sheet l &: I '0 Q I K1 2?. a s.

n 3 i i Q I Q George 0. Hue! 1N VEN TOR.

e013... BY w My G. o. HUET 3,040,687 I G. O. HUET BOAT BOTTOM June 26, 1962 Filed Aug. 11, 1958 2 Sheets-Sheet 2 George 0. Hue! INVENTOR. BY @M 15 Fig.5

3,046,687 v BOAT BUTTOM George 0. Huat, New (ii-leans, La., assignor to Higgins, Inc., New Grleans, La., a corporation of Louisiana Filed Aug. 11, 1958, SenNo. 754,308

12 Claims. (ill. 11456) This invention relates in general to new and useful improvements in boat hull construction, and more specifically to a boat hull having an struction.

In the design of a boat hull, the design of the bottom,

particularly the bow portion of the bottom is very critical.-

In a high speed boat hull, it is highly desirable that the bow portion of the bottom be so designed whereby it will readily cut through the water so as to minimize resistance. On the other hand,

boat does not have the tendency to dive nor it is desirable that the bow is so constructed whereby the boat will continuously pound. Normally, in order to obtain an inmade relatively thin and thus crease in speed, the bow is improved bottom conit is necessary that the bowconstruction be of such a nature whereby the bow of the valuable space is lost. Furthermore, when the bow is so constructed, there is little to resist the plunging of the bow with the result that the hull becomes unstable. On the other hand, if a relatively wide bow is used .the frontal resistance is too great. of the hull.

It is therefore the-primary object of this invention .to boat hull construction wherein the provide an improved bow is so constructed whereby maximumspeed may be attained and at the sametime resistance to the plunging of the bow is effected Another object of this invention is to provideanirnproved boat hull construction wherein the bottom thereof generally after the center is of a smooth construction and may be fiat, concave or convex, as desired, and the bow portion thereof is in the form of a plurality of longitudinally extending chines, the chines being so designed so A as to effectively deflect the water downwardly with the forward motion of the hull whereby a much safer and drier boat results.

Another object of this invention is to provide an improved boat hull construction which is of such a nature whereby there is provided easy riding with a minimum of pounding, improved running trim and a resistance of a downward suction of the bow to give a positive lift, which increases the running trim and thereby assures a drier, safer boat.

A still further object of this invention is to provide a j boat hull so shaped in construction, in creased speed, whereby the effective deflection of the bow wave at different zones is such to minimize the skin friction at all angles of longitudinal trim and wave conditions.

These will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accomthe interest of in- Also, there is excessive pounding by forming thebow froma plu-. rality of upwardly curving longitudinally extending.

greater the upper lifting force.

together with other objects and advantages which panying drawings forming a part hereof, wherein like. numerals refer to like parts throughout, and in whichz FIGURE 1 is a side elevation of the boat hull embodying the features of the present invention;

FIGURE 2 is a FIGURE 1;

FIGURE 3 is an tion line 33 of FIGURE 1 section of the boat bull in the vicinity of thestern;

FIGURE 4 is an taken substantially upon the-plane indicatedby the section line 44 ofFIGURE :1 section of the boat boat hull;

FIGURE 5 is an tion line.55 of FIGURE boat hull;

FIGURE 6 is an enlarged fragmentary sectional view taken substantially upon the plane indicated by the. section line .66 and shows the-transverse section of ,the;

boat hull and the rear part of the bow;

FIGURE 7 is an enlargedvfragmentary sectional view.

taken substantially upon the plane indicatedby the, sec tion line 7-7 of FIGURE 1 and showsvthe transverse section of the boat hull along the bow; and

FIGURE 8 is an enlarged-fragmentary transverse-sec-Q whichthe. chines are tional View showing the manner in formed. utilizing a metal construction.

Referring now to the drawings in detail, it will that there is illustratedthe boat hull which is the of this invention, the .boat hull being referred to eral by the reference numerallll.

tional. The boat hullincludesa pair 'ofsides- 12 and a bottom construction which is referred to ingeneral by the reference numeral 14. The boat hull 10 also includes. 1

superstructure of the,- boat hull 10. has not been illustrated and may be varied abow '16 and a transom 18. The

as is desired.

As is best illustrated in FIGURE 2, the.bott om 14. in-1 cludes a rear portion 20' tudinally extending chines. tirely across the bottom.

Referring now to FIGURES 3 and 4 in particular, it

will be seen, that the rear portion 20' of the bottom .14 is of the V construction. However, for thepurpose of this invention, it is only necessary that the rear portion I 20 of the bottom 14 be smooth and if desired, it may be either V, concave, or conve At approximately the mid-point of the bottom 14, the

smooth rear portion 20' is transformed into a plurality of longitudinally extending chines 24. The individual chines 24 extend entirely across the bottom 14 between the chines 26 at the intersections of the bottom 14 with the sides 12. The. chines 24' curve upwardly toward the bow 16 as is best shown in FIGURE 1 and in the transverse sections of FIGURES 5, 6 and 7.

Referring now to FIGURE 8 in particular, it will be seen that the chines 24 are formed, from the material used in constructing .the bottom 14. Each chine 24- is formed by an offset edge portion or, flange 28 of the bottom see tion 30. The offset edge portion 28 is secured to an adjacent longitudinal section 30 either by welding 32 or is formed integral therewith depending upon the particular hull construction. In any event, the width of the chines 2'4 is greatly in excess of the thickness of the material used in forming the bottom 14 and unlike the conventional lap strake construction, the chines 24 are formed for stabil- Patented June .26, 1962.

bottom plan view of the boat hull of enlarged transverse sectional view taken substantially upon theplane indicated by. thesec and shows the transverse enlarged transverse sectional ;.view.-v

and shows. the transverse hull just aft. of the mid-point of the.

enlarged transverse sectional view taken substantially upon the plane indicated by the sec-,.- 1 and. shows the transverse section of the boat hull forwardly of themid-point oftthe.

be seen subject in gen- The boat hull 10, with the exception of the bow construction thereof, is conven which is smooth and a forward portion 22 which is in the form of a plurality of longi- The chines 24 extend. en-

assures a drier and safer ity purpose as opposed to being an inherent part of the construction. Because the width of the chines 2.4 is in no way dependent upon the thickness of the material used in the construction of the bottom 14, it will be seen that the bow construction of the hull qualities.

In the construction of the bottom 14, should the boat be relatively small and a lightgauge metal is used, the chines 24 may be formed by a stamping or bendingoperation and thelongitudinal sections 30 may be integral parts of a sheet. On the other hand, when the construction of the hull must be heavier duty because of the size of the hull, it is necessary that, a particular gauge metal be used. Thismetal cannot be shaped so as to have the chines Z4 formed from an integral construction. The individual setcions 30 may either be cut from the sheet material used in forming the aft portion .of the bottom 14 or may be separate strips. In the event separate strips are used, the individual strips 30 may be extruded.

Iniaddition to the chines (2.4 and the normal chines 26 carrying at the intersection of the bottom and the sides of. the boat hull, the forward portions of the sides 12 are provided with chines 34. The chines 34 terminate forwardly of the mid-point of the hull 10, as is best shown in FIG- URES 1 and Q. 7

As will be readily apparent from the sections through the bow portion of the hull 10, there is an. increasein deadrise over the normal deadrise. This increase in deadrise is obtained without the loss of sectional area which is highly desirable in a hull design.

Because of the shape of the chines and the maximum offset obtained with the present construction, it will. be readily apparent that when the hull 10 has a tendency to nose down or plunge into the water, the surfaces of the offset striking thewater .will resist the downward plung ing of the bow and give a positive lift thereto, Furthenmore, because the individual chines 24 curve upwardly towards the bow, as the reaction of the water on lift which increases the the chines 2'4 willgivea positive. running trim of the hull. This hull. On the other hand, because-a maximum angle of deadrise is obtainable with the particular hull design, there is a minimum of pounding. The effective deflection of the bow wave in difierent zones due to the provision of the multiple chines along the bow at the bottom of the boat also minimizes skin friction at all angles of longitudinal trim and wave conditionsand thus results in increased speed, thus the provision of v the multiple annular chines dividing the hull bottom and sides into different zones results in a faster boat which has less. pounding and safer riding qualities without sacrificing sectional area in the bow.

10 may have the desired construction comprising a smooth after portion and a ribbed forward portion said forward and aft portions 3. In a boat hull, a bottom construction, said bottom construction comprising a smooth after portion and a ribbed forward portion said forward and aft portions being continuous and defining a longitudinally extending continuous planing surface, said ribbed forward portion being in the form of a plurality of angular chines defining longitudinally extending strip like areas with said areas being joined by-outwardly and downwardly facing T longitudinally extending flanges whereby an increased angle of deadrise is possible without loss of sectional area, said strip likeareas terminating at their rear ends in end portions substantially paralleling the longitudinal center line of said hull, the exposed width of each of said flanges being greater than the thickness of the materialfrom which said chines are formed.

boat hull 10 moyes forwardly, .the i The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly all suitable modifications and V equiyalents maybe resorted to, falling within the scope of the invention as claimed. a

What is claimed as new is as follows: i 1. In a boat hull, a bottom construction, said bottom construction comprising a smooth after portion and a ribbed forward portion said forward and aft portions :being continuous and defining a ongitudinally extending continuous planing surfacefs aid. ribbed. forward por tion being in the form of ap urality of angular chines defining longitudinally extending strip like areas with said areas being joined by outwardly and downwardly facing longitudinally extending flanges whereby an increased' angle "of deadrise is possible .without loss of sectional area, said strip like areas terminating at their rear ends in end portions substantially paralleling the longitudinal center line of said hull.

2. In a boat hull, a bottomiconstruction,, saidbottom ribbed forward portion said 4 =In a boat hull, a bottom construction, said bottom construction comprising a smooth after portion and a ribbed forward portion said forward and aft portions being continuous and defining a longitudinally extending said ribbed forward portion continuous planing surface, being in the form of a plurality of angular chines defining longitudinally extending strip like areas with said areas being joined by outwardly and downwardly facing longitudinally extending flanges whereby an increased angle of deadris'e is possible without loss of sectional area, said striplike areasterminating at their rear ends in end portions substantially paralleling the longitudinalcenter line of said hull, each of said flanges being integral with the next adjacent area toward the longitudinal center line of the hull, the exposed width of each of said flanges being greater than the thickness of the material from which said chines are formed.

5. 'In a boat hull, a bottom construction, said bottom construction comprising a smooth after portion and a ribbed forward portion said forward and aft portions being continuous and-defining a longitudinally extending continuous planing surface, said ribbed forward portion a plurality of angular chines defining longitudinally extending strip like areas with said areas being in the form of being joined by outwardly and downwardly facing longitudinally extending flanges whereby an increased angle of deadrise is possible without loss of sectional area, said strip like areas terminating at their rear ends in end portions substantially paralleling the longitudinal ,center line of said hull, said boat hull having sides, said chines extending completely between saidsides.

6. In a boat hull, a bottom construction, said bottom construction comprising a smooth after portion and a forward and aft portions being continuous and defining a longitudinally extending continuous planing surface, said ribbed forward portion being in the form of a plurality of angular chines defining longitudinally extending strip like areas with said areas being joined by outwardly and downwardly facing longitudinally extending flanges whereby an increased angle of deadrise .is'possible without loss of sectional area, said strip like areas terminating at their rear ends in end portions substantially paralleling the of said hull, said boat hull having sides, said chines extending completely between said sides, said sides including forward portions, a lower part of each side forward porlongitudinal center line tion being in the form of an angular chine correspond ing to said chines of said bottom construction.

7. In a boat hull, a bottom construction, said bottom construction comprising a smooth after portion, and a ribbed forward portion said forward and aft portions being continuous and defining a longitudinally extending continuous planing surface, said ribbed forward portion being in the form of a plurality of angular chines defining longitudinally extending strip like areas with said areas being joined by outwardly and downwardly facing longitudinally extending flanges whereby an increased angle of deadrise is possible without loss of sectional area, said strip like areas terminating at their rearends in end portions substantially paralleling the longitudinal center line of said hull, each ofsaid flanges being integral with the next adjacent area toward the longitudinal center line of the hull, said boat hull having sides, said chines extending completely between said sides.

8. In a boat hull, a bottom construction, said bottom construction comprising a smooth after portion and a ribbed forward portion said forward and aft portions being continuous and defining a longitudinally extending continuous planing surface, said ribbed forward portion being in the form of a plurality of angular chines defining longitudinally extending strip like areas with said areas being joined 'by outwardly and downwardly facinglongitudinally extending flangeswhereby an increased angle of deadrise is possible without loss of sectional area, said strip like areas terminating at their rear ends in end portions substantially paralleling the longitudinal center line of said hull, the exposed width of each of said flanges being greater than the thickness of the material from which said chines are formed, said boat hull having sides, said chines extending completely between said sides.

9. In a boat hull, a bottom construction, said bottom construction comprising a smooth after portion and a ribbed forward portion said forward and aft portions being continuous and defining a longitudinally extending continuous planing surface, said ribbed forward portion being in the form of a plurality of angular chines defining longitudinally extending strip like areas with said areas being joined by outwardly and downwardly facing longitudinally extending flanges whereby an increased angle of deadrise is possible without loss of sectional area, said strip like areas terminating at their rear ends in end portions substantially paralleling the longitudinal center line of said hull, said boat hull having sides, said chines extending completely between said sides, said sides including forward portions, a lower part of each side forward portion being in the form of an angular chine corresponding to said chines of said bottom construction, the exposed width of each of said flanges being greater than the thickness of the material from which said chines are formed.

10. In a boat hull, a boat bottom construction, said bottom construction comprising a smooth after portion and a ribbed forward portion, said forward and aft portions being continuous and defining a longitudinally extending continuous planing surface, said ribbed forward portion being in the form of a plurality of angular chines spaced transversely of and extending longitudinally of said forward portion between opposite sides thereof, said angular chines including at least rear end portions substantially paralleling the longitudinal center line of said hull.

11. The combination of claim 10 wherein said forward portion terminates at its forward end in a bow structure, said angular chines on opposite sides of a vertical plane containing the longitudinal center line of said hull curving upwardly toward said bow and being forwardly convergent.

12. The combination of claim 10 wherein said hull has sides, said chines extending completely between said sides, said sides each being provided with at least one longitudinally extending chine in the forward portion of said hull spaced slightly above the bottom edges thereof, said side chines curving upwardly toward the bow of said hull.

References Cited in the file of this patent UNITED STATES PATENTS