Hydrofoil watercraft and method of manufacture of the same

Abstract

A hydrofoil watercraft, in particular, a hydrofoil board is described herein. The hydrofoil board may comprise one or more of a body, a hydrofoil assembly, and/or other components. The body may have one or more of a deck surface configured to support a rider, a bottom surface opposite the deck surface, and/or other surfaces and/or features. The body may comprise a fore portion having a planing surface forming part of the bottom surface. The body may have an aft portion having an aft bottom surface forming part of the bottom surface. The fore portion may be toward a front end of the board. The aft portion may be toward a rear end of the board. An aft cross-sectional thickness between the deck surface and the aft bottom surface may be less than a fore cross-sectional thickness between the deck surface and the planing surface.

Claims

1. A hydrofoil board comprising: a body, the body having a deck surface, and a bottom surface opposite the deck surface, the body comprising: a fore portion toward a front end of the hydrofoil board; an aft portion toward a rear end of the hydrofoil board; and a step transition disposed between the fore portion and the aft portion, wherein the step transition forms a transition surface connecting between the aft portion and the fore portion, the transition surface forming part of the bottom surface; wherein the deck surface is substantially even across the fore portion and the aft portion of the body; and wherein the fore portion comprises a majority of the body of the hydrofoil board based one or more of a length, a volume, and/or a surface area of the body.

2. The hydrofoil board of claim 1, wherein the step transition bridges an offset distance between an aft bottom surface of the aft portion and a fore bottom surface of the fore portion, and wherein the offset distance is more than half of a cross-sectional thickness of the fore portion.

3. The hydrofoil board of claim 1, wherein a fore cross-sectional thickness of the fore portion is substantially larger than an aft cross-sectional thickness of the aft portion.

4. The hydrofoil board of claim 3, wherein the fore cross-sectional thickness is more than twice as large as the aft cross-sectional thickness.

5. The hydrofoil board of claim 1, wherein the bottom surface has a bottom surface area, the bottom surface area including a fore bottom surface area of the fore portion, an aft bottom surface area of the aft portion, and a transition surface area of the transition surface, and wherein the fore bottom surface area is more than one half of the bottom surface area.

6. The hydrofoil board of claim 1, wherein the body is defined by the volume, and the fore portion forms more than two thirds of the volume of the body.

7. The hydrofoil board of claim 1, wherein the body is defined by the length, and the fore portion forms more than two thirds of the length of the body.

8. The hydrofoil board of claim 1, further comprising a hydrofoil assembly.

9. The hydrofoil board of claim 8, wherein the hydrofoil assembly includes a strut, a mounting plate, and one or more wings.

10. The hydrofoil board of claim 8, wherein the aft portion includes one or more mounting components configured to facilitate a mounting of the hydrofoil assembly.

11. The hydrofoil board of claim 1, wherein the hydrofoil board is non-powered and controlled by a rider.

12. A method of manufacture of a hydrofoil board, the method comprising: determining one or more of a length, a volume, and/or a surface area of a body of the hydrofoil board, the body having a deck surface, and a bottom surface opposite the deck surface; forming a fore portion of the body toward a front end of the hydrofoil board, including forming the fore portion to comprise a majority of the body of the hydrofoil board based one or more of the length, the volume, and/or the surface area of the body; forming an aft portion of the body toward a rear end of the hydrofoil board; forming a step transition between the fore portion and the aft portion, wherein the step transition forms a transition surface connecting between the aft portion and the fore portion, the transition surface forming part of the bottom surface; and forming the deck surface substantially even across the fore portion and the aft portion of the body.

13. The method of claim 12, wherein the step transition bridges an offset distance between an aft bottom surface of the aft portion and a fore bottom surface of the fore portion, and wherein the offset distance is more than half of a cross-sectional thickness of the fore portion.

14. The method of claim 12, wherein a fore cross-sectional thickness of the fore portion is substantially larger than an aft cross-sectional thickness of the aft portion.

15. The method of claim 14, wherein the fore cross-sectional thickness is more than twice as large as the aft cross-sectional thickness.

16. The method of claim 12, wherein the bottom surface has a bottom surface area, the bottom surface area including a fore bottom surface area of the fore portion, an aft bottom surface area of the aft portion, and a transition surface area of the transition surface, and wherein the fore bottom surface area is more than one half of the bottom surface area.

17. The method of claim 12, wherein the body is defined by the volume, and the fore portion forms more than two thirds of the volume of the body.

18. The method of claim 12, wherein the body is defined by the length, and the fore portion forms more than two thirds of the length of the body.

19. A hydrofoil board having a body and a single step transition, wherein the single step transition is formed toward a rear end of the body between a fore portion of the body and an aft portion of the body, and wherein the single step transition configures a bottom surface of the body to bridge an offset distance between the fore portion to the aft portion by virtue of the fore portion being about one and a half to five times as thick as the aft portion.

20. The hydrofoil board of claim 19, wherein the offset distance is in a range of five to twenty centimeters.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 illustrates a top view of a hydrofoil watercraft, in accordance with one or more implementations.

(2) FIG. 2 illustrates a bottom view of a hydrofoil watercraft, in accordance with one or more implementations.

(3) FIG. 3 illustrates a side view of a hydrofoil watercraft, in accordance with one or more implementations.

(4) FIG. 4 illustrates a side view of a hydrofoil watercraft, in accordance with one or more implementations.

(5) FIG. 5 illustrates a bottom view of a hydrofoil watercraft, in accordance with one or more implementations.

(6) FIG. 6 illustrates a side view of a hydrofoil watercraft, in accordance with one or more implementations.

(7) FIG. 7 illustrates a hydrofoil assembly, in accordance with one or more implementations.

(8) FIG. 8 illustrates a hydrofoil watercraft including a hydrofoil assembly, in accordance with one or more implementations.

(9) FIG. 9 illustrates a hydrofoil watercraft including hydrofoil assembly planing atop a surface of water, in accordance with one or more implementations.

(10) FIG. 10 illustrates the hydrofoil watercraft including hydrofoil assembly of FIG. 9 showing a planing surface leaving the surface of the water at a step transition, in accordance with one or more implementations.

(11) FIG. 11 illustrates the hydrofoil watercraft including hydrofoil assembly of FIG. 9 showing the hydrofoil watercraft being fully supported by the hydrofoil assembly, in accordance with one or more implementations.

(12) FIG. 12 illustrates a method of manufacture of a hydrofoil watercraft.

(13) FIG. 13 illustrates a hydrofoil watercraft including one or more channels, in accordance with one or more implementations.

(14) FIG. 14 illustrates a two-piece hydrofoil watercraft, in accordance with one or more implementations.

(15) FIG. 15 illustrates a bottom view of a hydrofoil watercraft including a removable attachment in a detached position, in accordance with one or more implementations.

(16) FIG. 16 illustrates a bottom view of a hydrofoil watercraft including a removable attachment in an attached position, in accordance with one or more implementations.

(17) FIG. 17 illustrates a side view of a hydrofoil watercraft including a removable attachment in an attached position, in accordance with one or more implementations.

DETAILED DESCRIPTION

(18) FIG. 1 illustrates a view of a hydrofoil watercraft, in particular, a hydrofoil board 100, in accordance with one or more implementations. However, those skilled in the art may recognize that one or more features and/or functionality described herein may be carried out on other watercraft, powered and non-powered, without departing from the scope and intent of the present disclosure.

(19) It is noted that terms such as “fore” and “aft” used herein may refer to conventional use of such terms as applied to conveying spatial orientation in a marine environment or location on a vessel. The use of these terms with various components should therefore be easily understood by a person skilled in the art as related to orientation, direction, and/or disposition. Further, some directions may be specifically defined herein and/or shown in the figures.

(20) The hydrofoil board 100 may comprise one or more of a body 101, a hydrofoil assembly (not shown in FIG. 1), and/or other components. The body 101 may have one or more of a deck surface 102 (e.g., a top surface) configured to support a rider, a bottom surface (not shown in FIG. 1) opposite the deck surface 102, and/or other surfaces and/or features. The body 101 may have a fore end 104 and an aft end 106. The fore end 104 may comprise a front end of the body 101 and may be what is generally referred to as the “nose”. The aft end 106 may comprise a rear end of the body 101 and may be what is generally referred to as the “tail”. An aft-to-fore direction (e.g., from the aft end 106 to the fore end 104) may define a direction of travel of the hydrofoil board 100 during use. In some implementations, the deck surface 102 may be substantially even across the body 101 between the fore end 104 and the aft end 106. In some implementations, “substantially even” may mean that the deck surface 102 is formed without breaks or irregularities between the fore end 104 and the aft end 106 and/or that the deck surface 102 lies on a single plane. In some implementations, the deck surface 102 may be substantially flat. In some implementations, the deck surface 102 may exhibit some curvature due to a curvature of the body 101 and/or portion of the body 101 (e.g., “rocker”). It is also contemplated that the deck surface 102 may include and/or may be modified to include additional components such as foot bindings, a cushion (e.g., “stomp pad”), camera mounts, and/or other devices.

(21) In FIG. 2 showing a bottom view of the hydrofoil board 100, the body 101 may be comprised of one or more of a fore portion 108, an aft portion 112, a step transition 116 between the fore portion 108 and the aft portion 112, and/or other portions and/or components. The fore portion 108 may be disposed toward a front end (e.g., fore end 104). The aft portion 112 may be disposed toward a rear end (e.g., aft end 106). (32) The body 101 may have an overall length, “L1”. The overall length L1 may be measured from the fore end 104 to the aft end 106. In some implementations, the fore end 104 may be curved to a point and/or may have other shapes. The overall length L1 may be measured from the point and/or a central part of a curve of the fore end 104. In some implementations, the aft end 106 may be truncated, may be curved, and/or may have other shapes found in surfboard designs. The overall length L1 may be measured from the point or a central part of the aft end 106.

(22) The overall length L1 may be a sum of a length “L2” of the fore portion 108 and a length “L3” of the aft portion 112. The length L2 may be measured from the fore end 104 to the step transition 116. The length L3 may be measured from the step transition 116 to the aft end 106. The step transition 116 may be flat, curved, or have other shapes. Measuring from the step transition 116 may be approximated from a central part of the step transition 116 and/or other part.

(23) In some implementations, the length L2 of the fore portion 108 may be more than one half and less than seven eighths of the overall length L1. In some implementations, the length L2 of the fore portion 108 may comprise approximately one half of the overall length L1. In some implementations, the length L2 of the fore portion 108 may be more than one half of the overall length L1. In some implementations, the length L2 of the fore portion 108 may comprise approximately two thirds of the overall length L1. In some implementations, the length L2 of the fore portion 108 may comprise approximately five eighths of the overall length L1. In some implementations, the length L2 of the fore portion 108 may comprise more than two thirds of the overall length L1. In some implementations, the length L2 of the fore portion 108 may comprise approximately four fifths of the overall length L1. In some implementations, the length L2 of the fore portion 108 may comprise more than four fifths of the overall length L1.

(24) The fore portion 108 may form a hull. The fore portion 108 forming the hull may provide the majority of the buoyancy for a rider atop the hydrofoil board 100. The body 101 may have a volume. In some implementations, the fore portion 108 may form between one half and seven eighths of the volume of the body 101. The body 101 may have a volume. In some implementations, the fore portion 108 may form five eighths of the volume of the body 101. In some implementations, the fore portion 108 may form more seven eighths of the volume of the body 101. In some implementations, the fore portion 108 may form about ninety percent of the volume of the body 101. In some implementations, the fore portion 108 may form approximately two thirds of the volume of the body 101. In some implementations, the fore portion 108 may form more than two thirds of the volume of the body 101. In some implementations, the fore portion 108 may form approximately fourth fifths of the volume of the body 101. In some implementations, the fore portion 108 may form more than fourth fifths of the volume of the body 101.

(25) As shown in FIG. 2, the fore portion 108 may have a planing surface 110. The planing surface 110 may provide a surface upon which the hydrofoil board 100 planes atop a surface of a body of water. The planing surface 110 may form part of the bottom surface of the body 101.

(26) The aft portion 112 may have an aft bottom surface 114. The aft bottom surface 114 may form part of the bottom surface of the body 101. The aft portion 112 may be configured to mount a hydrofoil assembly (not shown in FIG. 2) on or through the aft bottom surface 114. The aft portion 112 may include one or more mounting components 115 configured to facilitate the mounting of the hydrofoil assembly on or through the aft bottom surface 114. The one or more mounting components 115 may include conventional mounting components typically found in surfboards and/or hydrofoil watercraft. By way of non-limiting illustration, the one or more mounting components 115 may include one or more channels, one or more recesses, one or more plugs, and/or other devices. In some implementations, the one or more mounting components 115 may include one or more devices typically found in fin boxes of surfboards configured to mount removable fins.

(27) The aft portion 112 may be configured such that it may extend from the fore portion 108. The aft portion 112 may extend from the fore portion 108 such that the aft portion 112 is an extension of the hull formed by the fore portion 108. In FIG. 3 showing a side view, aft portion 112 may extend from the fore portion 108 such that the deck surface 102 may be substantially even across the fore potion 108 and the aft portion 112 of the body 101. In some implementations, “substantially even” may mean that the deck surface 102 is formed without breaks or irregularities between the fore potion 108 and the aft portion 112 and/or that the deck surface 102 lies on a single plane. In some implementations, the deck surface 102 may be substantially flat. In some implementations, the deck surface 102 may exhibit some curvature due to a curvature of the body 101 and/or portion of the body 101 (e.g., rocker).

(28) In some implementations, the aft bottom surface 114 and the planing surface 110 may be on uneven planes. In some implementations, “on uneven planes” may mean that bottom surface of the body 101 is formed with a break between the fore potion 108 and the aft portion 112 and/or that the aft bottom surface 114 and the planing surface 110 lie on different, offset, planes. In some implementations, the break between the fore potion 108 and the aft portion 112 may be the step transition 116.

(29) In some implementations, the fore portion 108 may have a fore cross-sectional thickness T1 between the deck surface 102 and the planing surface 110. The aft portion 112 may have an aft cross-sectional thickness T2 between the deck surface 102 and the aft bottom surface 114. In some implementations, the aft cross-sectional thickness T2 between the deck surface 102 and the aft bottom surface 114 may be less than the fore cross-sectional thickness T1 between the deck surface 102 and the planing surface 110. In some implementations, the thickness may be measured from centerline along a longitudinal axis of the body 101 and/or at other locations.

(30) In some implementations, the fore cross-sectional thickness T1 may be in a range of one and a half to five times as thick as the aft cross-sectional thickness T2. In some implementations, the fore cross-sectional thickness T1 may be about twice as thick as the aft cross-sectional thickness T2. In some implementations, the fore cross-sectional thickness T1 may be about three times as thick as the aft cross-sectional thickness T2. In some implementations, the fore cross-sectional thickness T1 may be more than three times as thick as the aft cross-sectional thickness T2. In some implementations, the fore cross-sectional thickness T1 is about one and a half times as thick as the aft cross-sectional thickness T2. In some implementations, a ratio of T1:T2 may be 1.5:1. In some implementations, a ratio of T1:T2 may be 2:1. In some implementations, a ratio of T1:T2 may be 3:1. In some implementations, a ratio of T1:T2 may be 4:1. In some implementations, a ratio of T1:T2 may be 5:1.

(31) In FIG. 3, the body 101 may include a side surface 120. The side surface 120 may form what is conventionally referred to as the “rail”. The other side may be a mirror image of the view in FIG. 3.

(32) In FIG. 3, the planing surface 110 of the fore portion 108 may terminate at the step transition 116. The step transition 116 may therefore be disposed between the fore portion 108 and the aft portion 112. The step transition 116 may form a transition surface 118 connecting the aft bottom surface 114 to the planing surface 110. The transition surface 118 may form part of the bottom surface. In some implementations, the step transition 116 may form a sharp (e.g., abrupt) transition between the fore portion 108 and the aft portion 112. By way of non-limiting illustration, the step transition 116 may be configured such that the transition surface 118 may be substantially orthogonal to the aft bottom surface 114 and/or the planing surface 110. However, the step transition 116 may be configured in other ways, such as being sloped (see, e.g., FIG. 5).

(33) The step transition 116 may bridge an offset distance, D, between the aft bottom surface 114 and the planing surface 110. In some implementations, the offset distance D may be in a range of two to twenty five centimeters. In some implementations, the offset distance D may be in a range of five to twenty centimeters. In some implementations, the offset distance D may be in a range of ten to fifteen centimeters. In some implementations, the offset distance D may be more than twenty five centimeters. In some implementations, the offset distance D may be less than two centimeters. In some implementations, the offset distance D may be about ten centimeters.

(34) The bottom surface of the body 101 may have a bottom surface area. The bottom surface area may be measured as a sum of one or more of a fore surface area of the planing surface 110, an aft surface area of the aft bottom surface 114, a transition surface area of the transition surface 118, and/or other surface areas. In some implementations, the fore surface area may comprise about one half and seven eighths of the bottom surface area of the body 101. In some implementations, the fore surface area may form more seven eighths of the bottom surface area of the body 101. In some implementations, the fore surface area may form about ninety percent of the bottom surface area of the body 101. In some implementations, the fore surface area may form approximately two thirds of the bottom surface area of the body 101. In some implementations, the fore surface area may form more than two thirds of the bottom surface area of the body 101. In some implementations, the fore surface area may form approximately fourth fifths of the bottom surface area of the body 101. In some implementations, the fore surface area may form more than fourth fifths of the bottom surface area of the body 101.

(35) FIG. 13 shows an implementation of the hydrofoil board 100 where the bottom surface of the body 101 includes one or more channels (depicted as channels 1302a-c). The one or more channels 1302a-c may be communicating between the fore portion 108 and the aft portion 112 through the step transition 116. Accordingly, in some implementations, the measurements of the cross-sectional thicknesses T1 and/or T1, and the offset distance D (FIG. 3) may be made from the thickest parts the body 101 not including the one or more channels 1302a-c. In some implementations, a given channel may include a lengthwise groove, or furrow, having its “lowest” surface even with the plane of the aft bottom surface 114, communicating through the step transition 116 and the fore portion 108, and terminating at or before the fore end 104. It is noted that the depiction in FIG. 13 is for illustrative purposes only and not to be considered limiting. Instead, those skilled in the art may appreciate other ways that channel(s) may be formed and/or otherwise incorporated into the bottom surface of the body 101.

(36) FIG. 4 shows an implementation of the hydrofoil board 100 where the fore portion 108 may be curved from the fore end 104 to the step transition 116. It is noted that the depiction in FIG. 4 is for illustrative purposes only and is not to be considered limiting. Instead, those skilled in the art may appreciate other ways to incorporate curvature, or “rocker”, into the wave ride hydrofoil board 100.

(37) FIG. 5 and FIG. 6 illustrate another implementation of the hydrofoil board 100 where the step transition 116 provides a gradual transition between fore portion 108 and the aft portion 112. The step transition 116 may form the transition surface 118 connecting the aft bottom surface 114 to the planing surface 110. The transition surface 118 may form part of the bottom surface. In some implementations, the step transition 116 may form the gradual transition between the fore portion 108 and the aft portion 112. By way of non-limiting illustration, the step transition 116 may be configured such that the transition surface 118 angles toward the aft end 106 connecting the aft bottom surface 114 to the planing surface 110. The transition surface 118 may angle toward the aft end 106 in a line, an arch or curve, and/or in other transition.

(38) FIG. 7 illustrates a hydrofoil assembly 700, in accordance with one or more implementations. The hydrofoil assembly 700 may include one or more of a mounting plate 702, a strut 704, one or more wings 706 (sometimes referred to as “hydrofoil wings” or “hydrofoils”). In some implementations, the mounting plate 702 may include one or more projections which insert into through an after bottom surface into one or more mounting components of an aft portion of a hydrofoil board. It is noted that the depiction and description of the hydrofoil assembly 700 is for illustrative purposes only and not to be considered limiting. Instead, it is to be understood that other types, forms, and/or configurations of hydrofoil assemblies suitable for a hydrofoil watercraft are within the scope of this disclosure.

(39) FIG. 8 illustrates a hydrofoil watercraft, specifically the hydrofoil board 100, including the hydrofoil assembly 700 of FIG. 7, in accordance with one or more implementations. In some implementations, the hydrofoil assembly 700 may mount to an aft portion of a hydrofoil board via the mounting plate 700 and one or more mounting components on the hydrofoil board using conventional hardware.

(40) FIGS. 9-11 depict a series of graphics showing the use and advantage(s) of the hydrofoil board 100 including the hydrofoil assembly 700. FIG. 9 illustrates hydrofoil board 100 including the hydrofoil assembly 700 planing atop a surface 900 of water, in accordance with one or more implementations. During in initial take off, the planing surface 110 may provide a surface upon which the hydrofoil board 100 planes atop the surface 900. Given the offset configuration of board 100, the aft bottom surface 114 may already be displaced a distance from the surface 900 of the water so that the aft bottom surface 114 may not provide a planing surface.

(41) FIG. 10 illustrates the hydrofoil board 100 including the hydrofoil assembly 700 of FIG. 9 showing the planing surface 110 leaving the surface 900 of the water at the step transition 116, in accordance with one or more implementations. Upon reaching a predetermined speed, the planing surface 110 may release from the surface 900 of the body of water at the step transition 116 hereby causing the hydrofoil board 100 to be fully supported by the hydrofoil assembly 700. Because the step transition 116 is positioned closer to the nose (compared to the distance from the tail to the nose), the board 100 leaves the surface 900 of the water sooner than if the bottom surface of the board 100 was continuous and even from nose to tail or continuous and even from nose to where the foil attaches. Since the board 100 can release from the surface 900 of the water sooner than conventional boards, the rider is able to effective ride on the foil sooner and therefore gain control of the board 100 sooner. FIG. 11 illustrates hydrofoil board 100 including the hydrofoil assembly 700 of FIG. 9 showing the hydrofoil board 100 being fully supported by the hydrofoil assembly 700, in accordance with one or more implementations. When fully supported by the hydrofoil assembly 700, a rider is able to achieve full control of the board 100 as intended (e.g., referred to as “foiling”).

(42) FIG. 14 illustrates the hydrofoil board 100 formed of a two-piece assembly. The hydrofoil board 100 may include one or more of a fore body 101a, an aft body 101b, and/or other portions. The fore body 101a may comprise the fore portion 108 of the board 100 (when assembled). The aft body 101b may comprise the aft portion 112 of the board 100 (when assembled). The two-piece assembly may allow the board 100 to be more easily stored and/or transported. Further, one or more of the pieces may be interchangeable so the rider can create boards with varying dimensions by switching out different pieces.

(43) The fore body 101a may have one or more of a first deck surface 102a (e.g., a top surface), the planing surface 110 opposite the first deck surface 102a, and/or other surfaces and/or features. The fore body 101a may have a first fore end 104a and a first aft end 106a. The first fore end 104a may comprise a front end of the fore body 101a and may be what is generally referred to as the “nose”. The first aft end 106a may comprise a rear end of the fore body 101a and may comprise the step transition 106 and transition surface 118. In some implementations, the first deck surface 102a may be substantially even across the fore body 101a between the first fore end 104a and the first aft end 106a.

(44) The aft body 101b may have one or more of a second deck surface 102b (e.g., a top surface), the aft bottom surface 114 opposite the second deck surface 102b, and/or other surfaces and/or features. The aft body 101b may have a second fore end 104b and a second aft end 106b. The second fore end 104b may comprise a front end of the aft body 101b and may comprise a contact surface for attaching to the first aft end 106a of the fore body 101a. The second aft end 106b may comprise a rear end of the aft body 101b and may generally form the “tail” of the board 100. In some implementations, the second deck surface 102b may be substantially even across the aft body 101b between the second fore end 104b and the second aft end 106b.

(45) In some implementations, the fore body 101a and the aft body 101b may be configured to removably attach to one another. By way of non-limiting illustration, the second fore end 104a of the aft body 101b may attached to the first aft end 106a of the fore body 101a. In some implementations, one or both of the fore body 101a or the aft body 101b may include one or more fasteners (not shown), and/or other components. In some implementations, the one or more fasteners may include latches, locks, and/or other fasteners. In some implementations, other components (not shown) may include devices to align the two pieces and/or provide structural support at the point of attachment. By way of non-limiting illustration, one or more dowels, pegs, and/or other components may be formed on one or both of the second fore end 104a of the aft body 101b or the first aft end 106a of the fore body 101a. One or both of the second fore end 104a of the aft body 101b or the first aft end 106a of the fore body 101a may then include complementary passages configured to receive the one or more dowels, pegs, and/or other components as the two pieces come together. It is noted that the depiction and accompanying descriptions of FIG. 14 are for illustrative purposes only and not to be considered limiting. Instead, those skilled in the art may appreciate other removable attachment techniques suitable for the intended purpose.

(46) FIG. 15 illustrates a bottom view of the hydrofoil board 100 including a removable attachment 1500 in a detached position, in accordance with one or more implementations. The removable attachment 1500 may comprise a body 1501 configured to removably attach to the aft portion 112 of the body 100. The body 1501 of the removable attachment 1500 may include one or more of a fore end 1504, an aft end 1506 opposite the fore end 1504, a bottom surface 1510, a top surface (not shown) opposite the bottom surface 1510, one or more edges 1520 (see, e.g., edge 1520 in FIG. 17) and/or other features.

(47) The removable attachment 1500 may be configured to offset the mounting component(s) for a hydrofoil assembly a distance from the aft bottom surface 114 and closer to (if not even with) the plane of the planning surface 110. The body 1501 of the removable attachment 1500 may comprise one or more mounting components 115b included on a bottom surface 1510. The removable attachment 1500 may attach to the aft portion 112 via the one or more mounting components 115 of the aft portion 112 using conventional hardware. However, in some implementations, attachment-specific fasteners and/or fastening mechanisms may be utilized (not shown).

(48) When attached, as shown in the bottom view of FIG. 16 and side view of FIG. 17, the one or more mounting components 115b of the removable attachment 1500 may be offset from the aft bottom surface 114 by an offset distance. The offset distance may be indicated by a thickness of the body 1501 of the measured from the top surface to the bottom surface 1510. When attached, the one or more mounting components 115b may be positioned in substantially the same position of as the one or more mounting components 115, albeit offset the offset distance. This configuration may effectively lengthen the hydrofoil assembly and/or the ride height of the hydrofoil board 100 when the hydrofoil assembly is attached, and the rider is foiling. The body 1501 of the removable attachment 1500 may have a width that is less than a width of the aft portion 112 so that advantages of the step transition 116 may still be maintained. That is, the removable attachment 1500 may only cover a portion of the aft portion 112 including the mounting components as opposed to the entirety of the aft portion 112 which would effectively eliminate the advantages of the step transition 116. In some implementations, the body 1501 may be substantially rectangular in shape. In some implementations, the body 1501 may taper from one end to the other. In some implementations, the body 1501 may be narrower at the aft end 1506 and wider at the fore end 1504.

(49) As shown in FIG. 17, the body 1501 of the removable attachment 1500 may have a thickness such that the bottom surface 1510 may be substantially even with the planing surface 110 of the fore portion 108. However, the body 1501 of the removable attachment 1500 may have other thicknesses such that the bottom surface 1510 may be disposed in a plane between the plane of the planing surface 110 and the plane of the aft bottom surface 114. In some implementations, although the inclusion of the removable attachment 115 may provide additional surfaces needing to detach from the surface of the water, the rider may appreciate the added effective length of the hydrofoil assembly when mounted.

(50) FIG. 12 illustrates a method 1200 of manufacture of a hydrofoil watercraft, in accordance with one or more implementations. The operations of method 1200 presented below are intended to be illustrative. In some implementations, method 1200 may be accomplished with one or more additional operations not described, and/or without one or more of the operations discussed. Additionally, the order in which the operations of method 1200 are illustrated in FIG. 12 and described below is not intended to be limiting.

(51) In some implementations, method 1200 may be implemented using manual and/or automated manufacturing techniques. A manual manufacturing techniques may include one or more forming techniques used by skilled artisans in watercraft and/or surfboard manufacture. A forming technique may include one or more of cutting, sanding and/or otherwise shaping a core substrate, such as a polyurethane foam, polystyrene, expanded polystyrene (EPS), wood, and/or other materials. A forming technique may include coating a shaped core substrate with one or more of fiberglass, resin, epoxy, carbon fiber, and/or other materials. Other techniques known to skilled artisans in watercraft and/or surfboard manufacture are also within the scope of the present disclosure. An automated manufacturing technique may include machines and one or more processing devices. The one or more processing devices and/or machines may include one or more devices executing some or all of the operations of method 1200 in response to instructions stored electronically on an electronic storage medium. The one or more processing devices and/or machines may include one or more devices configured through hardware, firmware, and/or software to be specifically designed for execution of one or more of the operations of method 1200.

(52) An operation 1202 may determine a volume of a body of a hydrofoil board. In some implementations, the volume may be determined based on an expected and/or actual weight of a rider. The body may have a deck surface configured to support a rider, a bottom surface opposite the deck surface, and/or other components. The bottom surface may have more than one part.

(53) An operation 1204 may form a fore portion of the body toward a front end of the hydrofoil board based on the volume. The fore portion may comprise more than two thirds of the volume of the body. The fore portion may form a hull having a planing surface upon which the hydrofoil board planes atop a surface of a body of water. The planing surface may form part of the bottom surface of the body.

(54) An operation 1206 may form an aft portion of the body extending from the fore portion toward a rear end of the hydrofoil board based on the volume. The aft portion may have an aft bottom surface forming part of the bottom surface of the body. The aft portion may be configured to mount a hydrofoil assembly on or through the aft bottom surface.

(55) An operation 1208 may form the deck surface. The deck surface may be formed substantially even across the fore potion and the aft portion of the body.

(56) An operation 1210 may form the bottom surface. Forming the bottom surface may include forming the aft bottom surface and the planing surface on uneven planes such that an aft cross-sectional thickness between the deck surface and the aft bottom surface may be less than a fore cross-sectional thickness between the deck surface and the planing surface.

(57) Although the present technology has been described in detail for the purpose of illustration based on what is currently considered to be the most practical and preferred implementations, it is to be understood that such detail is solely for that purpose and that the technology is not limited to the disclosed implementations, but, on the contrary, is intended to cover modifications and equivalent arrangements that are within the spirit and scope of the appended claims. For example, it is to be understood that the present technology contemplates that, to the extent possible, one or more features of any implementation can be combined with one or more features of any other implementation.