CA1183733A - Boat with sectional hull assembly held by geodesically oriented tendons - Google Patents
Boat with sectional hull assembly held by geodesically oriented tendonsInfo
- Publication number
- CA1183733A CA1183733A CA000401258A CA401258A CA1183733A CA 1183733 A CA1183733 A CA 1183733A CA 000401258 A CA000401258 A CA 000401258A CA 401258 A CA401258 A CA 401258A CA 1183733 A CA1183733 A CA 1183733A
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- CA
- Canada
- Prior art keywords
- tendons
- sections
- hull assembly
- hull
- boat
- 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
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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
- B63B7/00—Collapsible, foldable, inflatable or like vessels
- B63B7/02—Collapsible, foldable, inflatable or like vessels comprising only rigid parts
- B63B7/04—Collapsible, foldable, inflatable or like vessels comprising only rigid parts sectionalised
-
- 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
- B63B2007/006—Collapsible, foldable, inflatable or like vessels comprising nestable elements
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
- Emergency Lowering Means (AREA)
- Ropes Or Cables (AREA)
- Fencing (AREA)
Abstract
TITLE OF THE INVENTION
BOAT WITH SECTIONAL HULL ASSEMBLY HELD BY
GEODESICALLY ORIENTED TENDONS
ABSTRACT OF THE DISCLOSURE
A boat having a plurality of separable water-tight transverse sections combined end-to-end to form a hull assembly. A pair of tendons extend longitudinally along the hull assembly and are attached to the bow and stern sections.
The tendons follow geodesic lines along opposite sides of the longitudinal center line of the hull below the waterline and below the neutral axis.
BOAT WITH SECTIONAL HULL ASSEMBLY HELD BY
GEODESICALLY ORIENTED TENDONS
ABSTRACT OF THE DISCLOSURE
A boat having a plurality of separable water-tight transverse sections combined end-to-end to form a hull assembly. A pair of tendons extend longitudinally along the hull assembly and are attached to the bow and stern sections.
The tendons follow geodesic lines along opposite sides of the longitudinal center line of the hull below the waterline and below the neutral axis.
Description
31~
FIELD OF THE INVENTTON
The present invention relates to boats, and~ more particularly, to disassemblable boats that are formed in sections.
BACKGROUND OF THE IN N~IO
The assembly of the hull of a small ~oat by combin-i.ng transverse sections has a number of important advantages.
It is particularly advantageous when storing or transportinq the boat~ For example, many smaller cruising boats are ill suited to carrying a rigid~ non-inflatabl~ lifeboat or a dinghy for use in reaching shore once the larger boat has been moored. However, a rigid lifeboat or a dinghy that can be disassembled may be more easily stored on deck or below deck. Conventionally constructed boats used for fishing, 1~ sailing, and other recreational activities are often transport-ed by automobiles or small trucks and must be carried by trailer~ whereas a disassemblable boat might ~e carried on the vehicle itself.
There are~ however, a number of significant dis-advantages associated with ~oats formed of separable sections ", .
3~3~-~ 215~3 that may account for 'cheir lack of popularity. The assembly of such boats so ~chat their sections are se~ured together in ~~
an acceptable manner can be a difficult and time-consuming project. Many times, the construotion is such that the sections cannot be assembled in the water, thereby defeating many of the potential advantages of a disassemblable boat since room must be available in which to assemble it and sufficient personnel or equipment must be available to lift it into the water after it has been assembledu Obviously, a lD boat which requires time-consuming out of the water assembly is entirely unsuitable for use as a lifeboat.
Another serious problem that may be encountered with disassemblable boats is that of lealcage. Whenever connections are required below the waterLine, it is common to use through fasteners around which leakage can occur.
A principal objective of the present invention is to provide a disassemblable boat of sectional construction which avoids the problems and disadvantages mentioned above.
SUMMARY OF THE INVENTI_ The present invention resides in a boat that includes a hull assembly formed by a combination of transverse sections, including a bow section and a stern section. A
pair of tendons extend longitudinally along the hull assembly, being held by attachment devices that keep them in tension~
thereby preventing separation of the sections~ The tendons follow geodesic lines alon~ the hull, being positioned on opposite sides of the longitudinal hull center line, below ~ '73 ~ 2~553 the waterline and below the neutral axis. The tendons are best situated on the keel-most panels of the hull and below -- -the chines. Preferablyl the tendons are positioned in open grooves on the exterior surface of the boat hull but are held in the grooves by tension alone.
An attachment means is provided for securing the tendons to the hull and holding them in tension. Preferably, it cQnsists of a towing eye at the bow and tensioning means inside the stern sec~ion for tensioning the tendons against the eye.
The tendons can be used in combination with through fasteners that connect ad]acent sections above the waterline with the tendons preventing separation beneath the waterline. It is preferable that the various sections be shaped and dimensioned so that they can be internested as a further aid to storage with a minimum of space occupied.
Other features and advantages of the present invention will become apparent from the following detailed description, taken in coniunction with l:he accompanying drawings, which illustrate, by way of example, the principles of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGURE 1 is a side elevation of an assembled boat constructed in accordance with the invention;
FIG. 2 is a diagrammatic illustration of the hull config~ration in which the lines A-~ correspond to similar ., ~ 3 21553 lines indicated in FIG~ l;
FIGo 3 is a plan view of the assembled boat; ~~
FIG. 4 is an enlarged fragmentary view of a portion of the inside of the transom, taken as indicated by the arrow 4-4 of FIG. 3 and showing the attachment of the aft end of the tendon;
FIG. 5 is an enlarged view of a fragmentary portion of FIG. 1, as indicated by the arrow la, that shows an interlock be~ween hull sections;
FIGo 6 is an elevational view of the stern of the boat;
FIGo 6a is an enlarged fragmentary view of a portion of the stern section r taken as indicated by the arrow 6a in FIG. 6) the cables being omitted to show the grooves;
FIG. 7 is a end elevational view of the bow of the boat;
FIG. 8 is a plan view of the boat :in a disassembled condition with the sections internested FIGo 9 is a side elevation, similar to FIG. 1, showing a second boat constructed in accordance with the invention;
FIG~ 10 is a plan view of the boat of FIG. l;
FIGo 11 is an elevational view of the stern of the boat of FIG. 9; and FIG. 12 is an elevational view of the bow of the boat o FIG. 9.
~3~73~ 21553 DESCRIPTION OF TRE PREFEKRED EMBODIMENTS
An exemplary boat 10, constructed in accordance with the present invention and shown in FIGS. 1-8 of the accompanying drawings; includes a hull assembly 12 formed by four transverse sections 14, 16~ 17 and 18 arranged end-to-end.
The sections 14, 16, 17 and 18 each form a water-ti~ht enclosure that is open only at the top~ W~en disassembled~
the sections 14, 1~, 17 and 18 can be internested as shown in FIG. 8. The second mid-section 17 is the largest in each dimension so that it can receive the first mid-section 16 which in turn receives and the stern section 18. The bow section 14, which is the ~mallest, fits within the stern section 18.
The sections 14, 16, 17 and 18 can be made, for example, of fiberglass~resin, metal or ~wood. Alternatively, they can be of laminated construction, preferably using a low density core. The lines of this particular hull 12 assemly, while exhibiting a compound curvature, can be developed from plywood.
The mid sections 16 and 17 are each closed at the fore and aft ends by transverse bulkheads 20, which are parti~ions of about the same height as the vertical sides 22 of the boat 10 or slightly less. At the aft end of the bow section 14 is a similar bulkhead 24 that mates with and is contiguous with the fore bulkhead 20 of the first mid-section 16. In a similar manner, a fore bulkhead 26 on the stern section 1~ mates with the aft bulkhead 20 of the second mid-section 17.
3~
As an aid in assembling the hull 12 and.aligning the sections 14, 16, 17 and 18~ the bulkheads 20 of the -- -mid-sections 17 and 18 carry lips 28 which extend over and engage the top edges of the adioining bulkheads 24 and 26 (as best shown in FIG. la) Thus, the sections 14, 16, 17 and 18 are interlocked and properly positioned.
There are apertures in the mating bulkheads 20, 24 and 26 that receive through fasteners 32. These fasteners 32 are positioned well above the waterline of the hull 12 so that there is no significant leakage around them. Although ordinary marine bolts can be used, the preferrred fasteners 32 are quarter turn cam lock fasteners of a type conventionally used for marine applications.
It will be noted that once the hull 12 is assembled and placed in the water, any weight in the center of the hull will tend to force the sections 14, 16, 17 and 18 apart at the bottom and together at the top. ~his is because the I buoyancy at the longitudinal outer limits of ~he hull 12 ¦ places the entire floating structure under a substantial ¦ 20 bending moment, thereby applying compressive forces at ~he top and tensile forces at the bottom. There is an imaginary neutral axis A' ~Fig. 1) extending longitudinally through the hull 12 where the structure is neither in compression nor in tension. To counteract the tendency of the sections 14, 16, 17 and 18 to separate at the bottom, it is necessary to secure them below the waterline (not indicated) because there are practical limits on the strength, rigidity, size and weiyht of the sections that are obtainable in a structure intended to float.
~ 3 21553 Attachment of the sections 14l 16~ 17 and 18 below the waterline is accomplished by two corrosion-resistant, woven steel tendons 34 that extend along the hull 12 from the bow to the stern. To receive these tendons 34, two downwardly facing longitudinal grooves 36 are provided, each extending along the bottom of the entire hu11 assembly 12 (see FIG. 4).
The lines followed by the tendons 34 and the grooves 36 are geode5ic. That is, they are lines on the external surface of the hull 12 naturally followed by the tendons 34 when in tension/ i.e., they are the shortest lines between the points at which the tendons are secured to the hull. Thus, it is not necessary to manually position the tendons 34 along the length of the grooves 36. The tendons 34 naturally fall into the grooves 36 when stretched over the h~ll 12 and tend to resist forces that would displace them laterally out of the grooves. However, the use of the grooves 36 prevents the tendons 34 from chafing against the hull 12. The grooves 36 also prevent the tendons 34 from snagging on underwater obstacles and debris and protect the tendons when the boat 10 is beached.
To hold the tendons 34 is tension, they are commonly held at their fore ends by an eye 52 (FIG. 7), which is referred to as a "towing eye" because it can also serve as an attachment point for a painter. The towing eye 5~ should be placed at an appropriate height to serve this dual purpose.
The aft ends of the tendons 34 extend up the outside of the transom 38, over the top edge, and are releasably secured to over-center levers 58 that are permanently mounted on the ~ 3~7~ ~ 21553 interior surface of the transom above the waterline and inside the stern section 18. Once the over-center levers 58 ~~ -have been latched~ they firmly secure the hullrsections 14, 16, 17 and 18 together along their adjoining lower edges~
S It should be noted that the hull 12 is symmetrical, the tendons 34 being equally spaced from opposite sides of the longitudinal hull center line B' passing on opposite sides of the center board trunk 59 and any rudder assembly (no~ shown). Th~ tendons 34 must be located below the neutral axis A' and below the waterline of the hull 12.
One important advantage to the use of two tendons 34 is that they provide redundance, keepiny the hull 12 essentially intact and operational if one tendon should fail.
To minirnize the asymmetry in the event that one tendon 34 should fail, the geodesic lines chosen should be close to the longitudinal center line B' (FIG, 3) or the keel if there is oneO In addition, placement of the tendons 34 close to the center line B' displaces them as far as possible from the neutral axis A,' thereby giving the tendons the maximum holding power for their tensile strength.
There are no apertures in the hull 12 below the waterline to serve as sources of leakage. Moreover, each of the hull sections 14~ 16, 17 and 18 can be made to Eloat by i~self, permitting the boat 10 to be assembled in the water.
Very little time or skill is required to assemble the boat 10. Once disassembled, it requires a minim~m o~ space since the hull sections 14, 16, 17 and 18 can be internested and the tendons 34 can be coiled and placed inside the sec~ions~
~ 3 ~
The principles of the invention are further illus-trated by a second boat 60, shown in FIGS. g 12. The hull 61 includes three hull se~tions 62, 64 and 66 instead of four as in the case of the boat lOo There are two tendons 70 that 5 extend symrnetrically along geodesic lines of the hull 61, lying in grooves 72. At the bow, the tendons 70 are attached to a towing eye 74 while in the stern section 68 they are held in tension by over-center levers 76.
The principal difference between the boat 10 and the boat 60 lies in the shape of the hull fil. Although the hull 61 is less efficient, having a less complex curvature with hard chines, its construction is less difficult to ~abricate and les expensive. The placement of the tendons 70, however, is similar to that of the Eirst boat 10, being i5 below the neutral axis and near to the center line. The tendons 70 ~re, in accordance with the plarameters given above, below t.he lowest chines of the hull 61 and on the keel most panels of the hull.
While particular forms of the invention have been illustrated and described, it will be apparent that various modifica~ions can be made without departing from the spirit and scope of the inventionO
FIELD OF THE INVENTTON
The present invention relates to boats, and~ more particularly, to disassemblable boats that are formed in sections.
BACKGROUND OF THE IN N~IO
The assembly of the hull of a small ~oat by combin-i.ng transverse sections has a number of important advantages.
It is particularly advantageous when storing or transportinq the boat~ For example, many smaller cruising boats are ill suited to carrying a rigid~ non-inflatabl~ lifeboat or a dinghy for use in reaching shore once the larger boat has been moored. However, a rigid lifeboat or a dinghy that can be disassembled may be more easily stored on deck or below deck. Conventionally constructed boats used for fishing, 1~ sailing, and other recreational activities are often transport-ed by automobiles or small trucks and must be carried by trailer~ whereas a disassemblable boat might ~e carried on the vehicle itself.
There are~ however, a number of significant dis-advantages associated with ~oats formed of separable sections ", .
3~3~-~ 215~3 that may account for 'cheir lack of popularity. The assembly of such boats so ~chat their sections are se~ured together in ~~
an acceptable manner can be a difficult and time-consuming project. Many times, the construotion is such that the sections cannot be assembled in the water, thereby defeating many of the potential advantages of a disassemblable boat since room must be available in which to assemble it and sufficient personnel or equipment must be available to lift it into the water after it has been assembledu Obviously, a lD boat which requires time-consuming out of the water assembly is entirely unsuitable for use as a lifeboat.
Another serious problem that may be encountered with disassemblable boats is that of lealcage. Whenever connections are required below the waterLine, it is common to use through fasteners around which leakage can occur.
A principal objective of the present invention is to provide a disassemblable boat of sectional construction which avoids the problems and disadvantages mentioned above.
SUMMARY OF THE INVENTI_ The present invention resides in a boat that includes a hull assembly formed by a combination of transverse sections, including a bow section and a stern section. A
pair of tendons extend longitudinally along the hull assembly, being held by attachment devices that keep them in tension~
thereby preventing separation of the sections~ The tendons follow geodesic lines alon~ the hull, being positioned on opposite sides of the longitudinal hull center line, below ~ '73 ~ 2~553 the waterline and below the neutral axis. The tendons are best situated on the keel-most panels of the hull and below -- -the chines. Preferablyl the tendons are positioned in open grooves on the exterior surface of the boat hull but are held in the grooves by tension alone.
An attachment means is provided for securing the tendons to the hull and holding them in tension. Preferably, it cQnsists of a towing eye at the bow and tensioning means inside the stern sec~ion for tensioning the tendons against the eye.
The tendons can be used in combination with through fasteners that connect ad]acent sections above the waterline with the tendons preventing separation beneath the waterline. It is preferable that the various sections be shaped and dimensioned so that they can be internested as a further aid to storage with a minimum of space occupied.
Other features and advantages of the present invention will become apparent from the following detailed description, taken in coniunction with l:he accompanying drawings, which illustrate, by way of example, the principles of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGURE 1 is a side elevation of an assembled boat constructed in accordance with the invention;
FIG. 2 is a diagrammatic illustration of the hull config~ration in which the lines A-~ correspond to similar ., ~ 3 21553 lines indicated in FIG~ l;
FIGo 3 is a plan view of the assembled boat; ~~
FIG. 4 is an enlarged fragmentary view of a portion of the inside of the transom, taken as indicated by the arrow 4-4 of FIG. 3 and showing the attachment of the aft end of the tendon;
FIG. 5 is an enlarged view of a fragmentary portion of FIG. 1, as indicated by the arrow la, that shows an interlock be~ween hull sections;
FIGo 6 is an elevational view of the stern of the boat;
FIGo 6a is an enlarged fragmentary view of a portion of the stern section r taken as indicated by the arrow 6a in FIG. 6) the cables being omitted to show the grooves;
FIG. 7 is a end elevational view of the bow of the boat;
FIG. 8 is a plan view of the boat :in a disassembled condition with the sections internested FIGo 9 is a side elevation, similar to FIG. 1, showing a second boat constructed in accordance with the invention;
FIG~ 10 is a plan view of the boat of FIG. l;
FIGo 11 is an elevational view of the stern of the boat of FIG. 9; and FIG. 12 is an elevational view of the bow of the boat o FIG. 9.
~3~73~ 21553 DESCRIPTION OF TRE PREFEKRED EMBODIMENTS
An exemplary boat 10, constructed in accordance with the present invention and shown in FIGS. 1-8 of the accompanying drawings; includes a hull assembly 12 formed by four transverse sections 14, 16~ 17 and 18 arranged end-to-end.
The sections 14, 16, 17 and 18 each form a water-ti~ht enclosure that is open only at the top~ W~en disassembled~
the sections 14, 1~, 17 and 18 can be internested as shown in FIG. 8. The second mid-section 17 is the largest in each dimension so that it can receive the first mid-section 16 which in turn receives and the stern section 18. The bow section 14, which is the ~mallest, fits within the stern section 18.
The sections 14, 16, 17 and 18 can be made, for example, of fiberglass~resin, metal or ~wood. Alternatively, they can be of laminated construction, preferably using a low density core. The lines of this particular hull 12 assemly, while exhibiting a compound curvature, can be developed from plywood.
The mid sections 16 and 17 are each closed at the fore and aft ends by transverse bulkheads 20, which are parti~ions of about the same height as the vertical sides 22 of the boat 10 or slightly less. At the aft end of the bow section 14 is a similar bulkhead 24 that mates with and is contiguous with the fore bulkhead 20 of the first mid-section 16. In a similar manner, a fore bulkhead 26 on the stern section 1~ mates with the aft bulkhead 20 of the second mid-section 17.
3~
As an aid in assembling the hull 12 and.aligning the sections 14, 16, 17 and 18~ the bulkheads 20 of the -- -mid-sections 17 and 18 carry lips 28 which extend over and engage the top edges of the adioining bulkheads 24 and 26 (as best shown in FIG. la) Thus, the sections 14, 16, 17 and 18 are interlocked and properly positioned.
There are apertures in the mating bulkheads 20, 24 and 26 that receive through fasteners 32. These fasteners 32 are positioned well above the waterline of the hull 12 so that there is no significant leakage around them. Although ordinary marine bolts can be used, the preferrred fasteners 32 are quarter turn cam lock fasteners of a type conventionally used for marine applications.
It will be noted that once the hull 12 is assembled and placed in the water, any weight in the center of the hull will tend to force the sections 14, 16, 17 and 18 apart at the bottom and together at the top. ~his is because the I buoyancy at the longitudinal outer limits of ~he hull 12 ¦ places the entire floating structure under a substantial ¦ 20 bending moment, thereby applying compressive forces at ~he top and tensile forces at the bottom. There is an imaginary neutral axis A' ~Fig. 1) extending longitudinally through the hull 12 where the structure is neither in compression nor in tension. To counteract the tendency of the sections 14, 16, 17 and 18 to separate at the bottom, it is necessary to secure them below the waterline (not indicated) because there are practical limits on the strength, rigidity, size and weiyht of the sections that are obtainable in a structure intended to float.
~ 3 21553 Attachment of the sections 14l 16~ 17 and 18 below the waterline is accomplished by two corrosion-resistant, woven steel tendons 34 that extend along the hull 12 from the bow to the stern. To receive these tendons 34, two downwardly facing longitudinal grooves 36 are provided, each extending along the bottom of the entire hu11 assembly 12 (see FIG. 4).
The lines followed by the tendons 34 and the grooves 36 are geode5ic. That is, they are lines on the external surface of the hull 12 naturally followed by the tendons 34 when in tension/ i.e., they are the shortest lines between the points at which the tendons are secured to the hull. Thus, it is not necessary to manually position the tendons 34 along the length of the grooves 36. The tendons 34 naturally fall into the grooves 36 when stretched over the h~ll 12 and tend to resist forces that would displace them laterally out of the grooves. However, the use of the grooves 36 prevents the tendons 34 from chafing against the hull 12. The grooves 36 also prevent the tendons 34 from snagging on underwater obstacles and debris and protect the tendons when the boat 10 is beached.
To hold the tendons 34 is tension, they are commonly held at their fore ends by an eye 52 (FIG. 7), which is referred to as a "towing eye" because it can also serve as an attachment point for a painter. The towing eye 5~ should be placed at an appropriate height to serve this dual purpose.
The aft ends of the tendons 34 extend up the outside of the transom 38, over the top edge, and are releasably secured to over-center levers 58 that are permanently mounted on the ~ 3~7~ ~ 21553 interior surface of the transom above the waterline and inside the stern section 18. Once the over-center levers 58 ~~ -have been latched~ they firmly secure the hullrsections 14, 16, 17 and 18 together along their adjoining lower edges~
S It should be noted that the hull 12 is symmetrical, the tendons 34 being equally spaced from opposite sides of the longitudinal hull center line B' passing on opposite sides of the center board trunk 59 and any rudder assembly (no~ shown). Th~ tendons 34 must be located below the neutral axis A' and below the waterline of the hull 12.
One important advantage to the use of two tendons 34 is that they provide redundance, keepiny the hull 12 essentially intact and operational if one tendon should fail.
To minirnize the asymmetry in the event that one tendon 34 should fail, the geodesic lines chosen should be close to the longitudinal center line B' (FIG, 3) or the keel if there is oneO In addition, placement of the tendons 34 close to the center line B' displaces them as far as possible from the neutral axis A,' thereby giving the tendons the maximum holding power for their tensile strength.
There are no apertures in the hull 12 below the waterline to serve as sources of leakage. Moreover, each of the hull sections 14~ 16, 17 and 18 can be made to Eloat by i~self, permitting the boat 10 to be assembled in the water.
Very little time or skill is required to assemble the boat 10. Once disassembled, it requires a minim~m o~ space since the hull sections 14, 16, 17 and 18 can be internested and the tendons 34 can be coiled and placed inside the sec~ions~
~ 3 ~
The principles of the invention are further illus-trated by a second boat 60, shown in FIGS. g 12. The hull 61 includes three hull se~tions 62, 64 and 66 instead of four as in the case of the boat lOo There are two tendons 70 that 5 extend symrnetrically along geodesic lines of the hull 61, lying in grooves 72. At the bow, the tendons 70 are attached to a towing eye 74 while in the stern section 68 they are held in tension by over-center levers 76.
The principal difference between the boat 10 and the boat 60 lies in the shape of the hull fil. Although the hull 61 is less efficient, having a less complex curvature with hard chines, its construction is less difficult to ~abricate and les expensive. The placement of the tendons 70, however, is similar to that of the Eirst boat 10, being i5 below the neutral axis and near to the center line. The tendons 70 ~re, in accordance with the plarameters given above, below t.he lowest chines of the hull 61 and on the keel most panels of the hull.
While particular forms of the invention have been illustrated and described, it will be apparent that various modifica~ions can be made without departing from the spirit and scope of the inventionO
Claims (9)
1. A boat comprising:
a plurality of separable, water-tight, transverse hull sections combined end-to-end to form a hull assembly having a predetermined compound, convex external curvature, said plurality of sections having adjoining transverse bulkheads and including at least a bow section and a stern section;
fastening means for connecting adjacent ones of said sections above the neutral axis of said hull assembly without substantially limiting the ability of said hull assembly to flex about its neutral axis;
a pair of tendons extending externally and longi-tudinally along said hull assembly from a connection point at the bow to a connection point at the stern, below the waterline and substantially below the neutral axis thereof on opposite sides of the longitudinal center line, each of said tendons following a curved geodesic line along a com-pound, convex curvature of an exterior surface of said hull assembly and following the shortest path outside said hull assembly between said connection points; and attachment means for securing said tendons to said bow and stern sections at said connection points and for holding said tendons in tension, thereby preventing separation of said sections.
a plurality of separable, water-tight, transverse hull sections combined end-to-end to form a hull assembly having a predetermined compound, convex external curvature, said plurality of sections having adjoining transverse bulkheads and including at least a bow section and a stern section;
fastening means for connecting adjacent ones of said sections above the neutral axis of said hull assembly without substantially limiting the ability of said hull assembly to flex about its neutral axis;
a pair of tendons extending externally and longi-tudinally along said hull assembly from a connection point at the bow to a connection point at the stern, below the waterline and substantially below the neutral axis thereof on opposite sides of the longitudinal center line, each of said tendons following a curved geodesic line along a com-pound, convex curvature of an exterior surface of said hull assembly and following the shortest path outside said hull assembly between said connection points; and attachment means for securing said tendons to said bow and stern sections at said connection points and for holding said tendons in tension, thereby preventing separation of said sections.
2. The boat of claim 1 wherein said hull assembly defines chines, said tendons being positioned beneath said chines.
3. The boat of claim 1 wherein at least part of said attachment means is disposed within said hull assembly.
4. The boat of claim 1 wherein said hull sections are shaped and dimensioned to be internested.
5. The boat of claim 1 wherein said attachment means comprises a single towing eye at the bow of said hull assembly to which both of said tendons are connected and tensioning means mounted in said stern assembly for tensioning said tendons against said eye.
6. A boat comprising:
a plurality of separable, water-tight, transverse hull sections combined end-to-end to form a hull assembly having a predetermined compound, convex external curvature, said plurality of sections having adjoining transverse bulkheads and including at least a bow section and a stern section;
a symmetrically arranged pair of tendons extending externally and longitudinally along said hull assembly from a connection point at the bow to a connection point at the stern, below the waterline and substantially below the neutral axis thereof on opposite sides of the longitudinal center line, each of said tendons following a curved geodesic line along a compound, convex curvature of an exterior surface of said hull assembly and following the shortest path outside said hull assembly between said connection points;
a pair of grooves extending along said hull assembly along said geodesic lines, said tendons being disposed within said groove; and attachment means for securing said tendons to said bow and stern sections at said connection points and for holding said tendons in tension, thereby preventing separation of said sectiops.
a plurality of separable, water-tight, transverse hull sections combined end-to-end to form a hull assembly having a predetermined compound, convex external curvature, said plurality of sections having adjoining transverse bulkheads and including at least a bow section and a stern section;
a symmetrically arranged pair of tendons extending externally and longitudinally along said hull assembly from a connection point at the bow to a connection point at the stern, below the waterline and substantially below the neutral axis thereof on opposite sides of the longitudinal center line, each of said tendons following a curved geodesic line along a compound, convex curvature of an exterior surface of said hull assembly and following the shortest path outside said hull assembly between said connection points;
a pair of grooves extending along said hull assembly along said geodesic lines, said tendons being disposed within said groove; and attachment means for securing said tendons to said bow and stern sections at said connection points and for holding said tendons in tension, thereby preventing separation of said sectiops.
7. The boat of claim 6 wherein said tendons are held in said grooves by tension alone.
8. A boat comprising:
at least three separable, water-tight, transverse sections combined end-to-end to form a hull assembly having a predetermined compound, convex external curvature, said plurality of sections including at least a bow section, a mid-section, and a stern section, said sections including adjoining transverse bulkheads, and said sections being shaped and dimensioned to be internested when diassembled;
interlocking means carried by at least one of said sections for positioning said sections in proper alignment;
fastening means extending through said bulkheads above the waterline of said hull assembly for connecting said sections;
a symmetrically arranged pair of flexible steel tendons extending externally and longitudinally along said hull assembly from a connection point at the bow to a connection point at the stern, below the waterline and below the neutral axis thereof and on opposite sides of the longitudinal center line, each of said tendons following a curved geodesic line along a compound, convex curvature of an exterior surface of said hull assembly and following the shortest path outside said hull assembly between said connection points;
a towing eye permanently secured to the bow of said hull assembly to which both of said tendons are attached at one of said connection points;
tensioning means mounted in stern section for tensioning said tendons against said eye; and a pair of open longitudinal grooves defined by said hull assembly within which said tendons are disposed, said grooves extending along said geodesic lines and said tendons being held in said grooves by tension alone.
at least three separable, water-tight, transverse sections combined end-to-end to form a hull assembly having a predetermined compound, convex external curvature, said plurality of sections including at least a bow section, a mid-section, and a stern section, said sections including adjoining transverse bulkheads, and said sections being shaped and dimensioned to be internested when diassembled;
interlocking means carried by at least one of said sections for positioning said sections in proper alignment;
fastening means extending through said bulkheads above the waterline of said hull assembly for connecting said sections;
a symmetrically arranged pair of flexible steel tendons extending externally and longitudinally along said hull assembly from a connection point at the bow to a connection point at the stern, below the waterline and below the neutral axis thereof and on opposite sides of the longitudinal center line, each of said tendons following a curved geodesic line along a compound, convex curvature of an exterior surface of said hull assembly and following the shortest path outside said hull assembly between said connection points;
a towing eye permanently secured to the bow of said hull assembly to which both of said tendons are attached at one of said connection points;
tensioning means mounted in stern section for tensioning said tendons against said eye; and a pair of open longitudinal grooves defined by said hull assembly within which said tendons are disposed, said grooves extending along said geodesic lines and said tendons being held in said grooves by tension alone.
9. The boat of claim 17 wherein said hull assembly defines chines, said tendons being positioned beneath said chines.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US25915281A | 1981-04-30 | 1981-04-30 | |
| US259,152 | 1981-04-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1183733A true CA1183733A (en) | 1985-03-12 |
Family
ID=22983744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000401258A Expired CA1183733A (en) | 1981-04-30 | 1982-04-20 | Boat with sectional hull assembly held by geodesically oriented tendons |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0064271A3 (en) |
| JP (1) | JPS58476A (en) |
| AU (1) | AU8308282A (en) |
| CA (1) | CA1183733A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3346377C2 (en) * | 1983-12-22 | 1986-02-27 | Hans-Hermann 7799 Illmensee Wittmaack | Dismountable boat |
| FR2619546B1 (en) * | 1987-08-17 | 1992-05-07 | Auguste Legoy | MODULAR NAVIGATION EQUIPPED WITH ROTARY FLOATS |
| JP2651889B2 (en) * | 1994-03-10 | 1997-09-10 | エース住宅株式会社 | Bamboo boat |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2120627A (en) * | 1936-12-04 | 1938-06-14 | John A Mouat | Collapsible boat |
| GB480987A (en) * | 1937-01-05 | 1938-03-03 | Saunders Roe Ltd | Improvements in folding boats, floats and other watercraft or floating vessels |
| GB516835A (en) * | 1938-07-20 | 1940-01-12 | Rowland Frank May | Improvements in or relating to foldable boats |
| US2457010A (en) * | 1947-02-28 | 1948-12-21 | John H Thedick | Portable boat |
-
1982
- 1982-04-20 CA CA000401258A patent/CA1183733A/en not_active Expired
- 1982-04-28 EP EP82103612A patent/EP0064271A3/en not_active Withdrawn
- 1982-04-28 AU AU83082/82A patent/AU8308282A/en not_active Abandoned
- 1982-04-30 JP JP57073241A patent/JPS58476A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| AU8308282A (en) | 1982-11-04 |
| EP0064271A2 (en) | 1982-11-10 |
| JPS58476A (en) | 1983-01-05 |
| EP0064271A3 (en) | 1983-06-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |