WAVE MACHINE

Abstract

A wave machine (8) that produces different shapes of standing, parabolic-shaped waveforms (150) used by surfers (200). The parabolic waveforms (150) have different face angles and depths. The machine (8) includes a rotating container (10) partially filled with a fluid 140. When the container (10) is rotated, a standing, parabolic waveform 150 is created in the fluid (140). In one embodiment, the container (10) is bowl container (11) with curved panels (60) and terminate at an upper edge (16). On or near the upper edge (16) of the sidewall (14) is upper flange (18) that partially extends into the bowl container (11). The bowl container (11) is coupled to a speed adjustable drive mechanism (50). As the bowl container (11) is rotated, fluid (14) is forced outward against the sidewall (14) and forms a parabolic waveform (150). As the speed of rotation is increased, the fluid (140) flows upward over the sidewall (14) and against the upper flange (18). The thickness, depth and face of parabolic waveform (150) adjacent to the sidewall (14) are increased.

Claims

1. A wave machine, comprising: a. a bowl container configured to be partially filled with a volume of water, said bowl container configured to float in a body of water and includes a center vertical axis and an upward extending curved sidewall, said curved sidewall includes an inside surface and an upper edge; b. an upper flange extending inward from said sidewall near said upper edge, said upper flange configured to prevent water flowing upward along said sidewall and beyond said upper edge and increasing the depth of said water adjacent to the sidewall; c. means for rotating said bowl container around said center vertical axis, said means for rotating configured to rotate said container at different speeds to create centrifugal forces on said water that causes said water o flow outward and upward against said sidewall and up to said upper flange and thereby form different parabolic waveforms different parabolic waveforms in said water that produces increased water depths adjacent to said sidewall such that a surfboard can be ridden on said waveform without striking said sidewall with said surfboards fins or bottom surface; and d. a control module connected to said means for rotating said bowl container that enables an operator to control the rotation speed of said bowl container in said body of water.

2. (canceled)

3. (canceled)

4. The wave machine as recited in claim 3 further including a plurality of paddles located on said curved sidewall of said bowl container.

5. The wave machine as recited in claim 3 further including a non-rotating, coaxially aligned island located inside said bowl container.

6. The wave machine as recited claim 5 further including a first walkway located around said upper edge of said bowl container.

7. The wave machine as recited in claim 6 further including a second walkway that extends from said first walkway onto said island.

8. The wave machine as recited in claim 5, further including a lanyard fixed at one end and detached opposite end, said detached opposite end extends into said bowl container and configured to be grabbed by a user when surfing.

9. (canceled)

10. (canceled)

11. (canceled)

12. The wave machine as recited in claim 1 wherein said bowl container comprises an outer ring made of a plurality of a plurality of floats each made of buoyant material and includes a parabolic-shaped inside surface with an inward extending upper flange.

13. The wave machine as recite in claim 12 further including a plurality of water chutes configured to deliver water from said body of water to said parabolic-shaped surfaces of said floats as said bowl container is rotated in said body of water.

14. The wave machine as recited in claim 13 further including sensors and actuators that monitor and control the flow of water into said water chutes and the formation of said parabolic waveform inside said bowl container as bowl container rotates in said body of water.

15. The wave machine as recited in claim 1 further including a water filter system that includes a water filter, an ingress conduit and an egress conduit.

16. The wave machine as recited in claim 15 further including a pump configured to pump water from said filtered water to a water tunnel generator adjacent to said upper edge of said bowl container.

17. (canceled)

18. (canceled)

19. (canceled)

20. The wave machine as recited in claim 1 wherein said container rotates inside an outer container containing said body of water.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0014] FIG. 1 shows top, front perspective view of a bowl-shaped container partially filled with water being rotated and forming a standing, parabolic waveform inside the container that extends partly up the sidewall of the container and used by a surfer.

[0015] FIG. 2 is another top, front perspective view of a bowl-shaped container shown in FIG. 1 being rotated at a faster rate and forming a standing, parabolic waveform inside the container that extends up to a flange located along the upper edge of the sidewall.

[0016] FIG. 3 is a side elevational view of the container shown in FIGS. 1 and 2.

[0017] FIG. 4 is a top, front perspective view of the container shown in FIGS. 1, 2 and 3 without water.

[0018] FIG. 5 is a top plan view of the container shown in FIG. 4 shown in FIGS. 1, 2 and 4.

[0019] FIG. 6 is a bottom plan view of the container shown in FIG. 5.

[0020] FIG. 7 is a sectional, side elevational view of the container taken along line 7-7 in FIG. 3.

[0021] FIG. 8 is a partial side elevational view of the hub assembly.

[0022] FIG. 9 is a partial perspective view showing how the edges of the outer panels overlapped and sealed together with an adhesive/sealant.

[0023] FIG. 10 is a partial, sectional view of the container partially filled with water and showing a volume of water moving outward and upward along the sidewall and against the upper flange.

[0024] FIGS. 11-16 are illustrations showing how the water inside the container is forced outward and creates different parabolic waveforms with different face angles and depths as the speed of the container is increased.

[0025] FIG. 17 is a top perspective view of the container partially filled with water that includes an optional coaxially aligned island, an optional first walkway located around the perimeter of the container and an optional second walkway that leads from the first walkway to the island.

[0026] FIG. 18 is a top perspective view of the container shown in FIG. 15 without water that includes an optional water filter system that includes a water filter, an ingress conduit, an egress conduit, a pump configured to pump filter water to a decorative water fall element located adjacent to said upper edge of the container.

[0027] FIG. 19 is a side elevational view of the container shown in FIG. 18.

[0028] FIG. 20 is a section view of the container partially filled with granules that are fluidized and moved outward and upward along the sidewall and against the upper flange to form a parabolic waveform.

[0029] FIG. 21 is a top perspective view of the rotating container configured to be filled with granules that form a fluidized bed shown in FIG. 20.

[0030] FIG. 22 is a top plan view of the container shown in FIG. 21.

[0031] FIG. 23 is a top perspective view of an air conduit used in the fluidized bed embodiment shown in FIGS. 20-22 with plurality of perpendicularly aligned branches and showing air holes formed in the air conduit and branches.

[0032] FIG. 24 illustrates air from the air conduit and branches being released and causing the granules to be fluidized.

[0033] FIG. 25 is a floating wave machine that uses an outer container in a large body of water.

[0034] FIG. 26 is a floating embodiment of the wave machine similar to floating wave machine shown in FIG. 25 that uses propellers on the outer container to rotate the outer container in a large body of water.

[0035] FIG. 27 is a sectional side elevational view of the wave machine shown in FIG. 25.

[0036] FIG. 28 is an enlarged, sectional view of the outer container and the island used in the wave machine shown in FIG. 25.

[0037] FIGS. 29 and 30 are partial, sectional, side elevational views of a bowl within a bowl embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION

[0038] A standing wave machine 8 comprising a container 10 configured to be partially filled with a fixed volume of fluid 140. The container 10 includes sidewall 14 and a top upper edge 16. Mounted on or near the upper edge 16 is an upper flange 18 that extends inward from the upper edge 16. The upper flange 18 is configured to block or prevent fluid 140 from flowing upward along the sidewall 14 and extending pass the upper edge 16. Coupled to the container 10 is a means for rotating the container 10 around its center vertical axis 13. The means for rotating is configured to rotate the container 10 at different speeds to create centrifugal forces on the fluid 140 that causes the outer edge of the fluid 140 to flow outward and upward against the sidewall 14 and form a parabolic waveform 150 used for surfing.

[0039] In the embodiments shown, the container 10 is a bowl-shaped structure, herein after called a bowl container 11, with closed bottom surface 12 and upward extending curved sidewall 14. The bowl container 11 is configured to rotate around its vertical axis 13 with a means for rotating the bowl container 11. The bowl container 11 is is configured to hold a fixed volume of a fluid 140. In one embodiment, the fluid 140 is water, indicated by the reference number 142 causing it to spread outward. When rotated, a centripetal force is imparted to the water 142. Friction between the sidewall 14 of the bowl container 11 and the water 142 causes the water 142 to rotate synchronously to the bowl container 11. As the bowl container 11 rotates, inertial forces constrained by centripetal force acting on the water 142 cause it to spread outward from the center and gather along the outside diameter and lift up above and dip below the normal or resting water level as the water 142 spreads out along the transitional, vertical, and past vertical surfaces of the sidewall 14. The effect of the centripetal force acting on the water 142 in the bowl container 11 is to form a wall of water gathered along the sidewall 14 moving in the direction of spin and conforming to the shape of the outside diameter of the sidewall 14. The parabolic waveform 150 is formed in the area of the bowl container 11 where surfing can be performed. When rotation of the bowl container 11 is discontinued, the water 142 returns to normal or resting levels as rotational energy is stopped and the bowl container 11 and the water 142 becomes stationary.

[0040] Different container forms, such as spherical, cylindrical, or toroidal, allow the vertical axis of rotation to be inclined to any orientation even all the way over to a horizontal axis of rotation provided the water velocity is fast enough to produce the needed centripetal force to keep the water 142 against the sidewall 14 of the bowl container 11. The ability of centripetal force to resist gravity allows the bowl container 11 to function in other than vertical axis of rotation. However, the high velocity water flow required for any axis of rotation other than vertical negates the purpose of this invention to simulate water velocities and operational water depths to that of open water traditional surfing which duplicates the traditional surfing experience.

[0041] The effect of the described centripetal wave machine 8 is to produce a standing parabolic waveform 150 with a front face where water flows past a surfer 200 riding a surfboard who remains in a relatively stationary position relative to the shore but is limited to maneuvering about the wave's face. The surfer 200 is pulled down the slope by gravity which propels the surfer against the flow of the water or upstream to the flow of water. The surfer 200 maneuvers said surfboard by turning up and down the wave face to position the surfboard to continuously glide down the water slope balancing the pull of gravity upstream against the downstream pull of the flow of water as it moves past the surfer along the sidewall. The surfer 200 is swept away with the flow of water if he falls off the surfboard where safety nets or other retrieval device can remove the surfer 200 and surfboard from the water flow. The surfer 200 may retreat to the non-rotating island 90. In the case of the centripetal wave machine, depending on container shape and configuration, the surfer 200 can also recover his surfboard as he is moving downstream with the flow and paddle with is hands and arms to catch the wave again as he directs the surfboard back down the slope of the wave face. Upon catching the wave again, the surfer 200 would again become relatively stationary as the water passes by him along the pool wall.

[0042] More specifically, FIG. 1 shows as wave machine 10 that uses a bowl container 11 partially filled with water 142. When the bowl container 11 is rotated, a standing, parabolic waveform 150 is formed inside the bowl container 11 that extends partly up the sidewall 14 and used by a surfer 200. The surfer 200 is shown holding onto an optional lanyard 74. Also shown in FIG. 1 is an upper flange 18 located over the top edge of the container 11 and a drive motor 50 and a control module 56.

[0043] FIG. 2 is a top front perspective view of the bowl-shaped container 11 in FIG. 1 that is rotated at a faster rate than the bowl container 11 in FIG. 1 which forms a form a higher standing, parabolic waveform 150′. The top edge of the parabolic waveform 150′ abuts the inside surface of the upper flange 18. As discussed further, the higher standing, parabolic waveform 150′ has a steeper front face and deeper relative to the bottom surface 12 and sidewall 14 of the bowl container 11.

[0044] As shown in FIGS. 3-5, the bowl container 11 includes a rigid frame 34 that includes a plurality of radially aligned beams 36. The proximal ends of the beams 36 are attached to a center hub assembly 24. As shown more clearly in FIG. 10, each beam 36 is attached to a curved inside member 38, a diagonal member 40 and a vertical member 42. The proximal end of each beam 36 extends beyond the vertical member 42. Attached to the proximal ends of the beams 36 is a horizontal end beam 44. The section of the top surface of the section of beam 36 that extends beyond the vertical member 42 is a circular, horizontal drive flange 46. Attached to the lower edge of the beam 36 near the distal end is a support wheel 37.

[0045] FIG. 4 shows curved panels 60 attached to the inside surface of the curved members 38. The curved panels 60 are configured so that the bottom surface 12 and an upper section of the sidewall 14 of the bowl container 11 are oriented approximately 60 degrees apart.

[0046] Located inside the central area of the bowl container 11 is a raised center dome 58 that extends over the bowl container's center axis 13. The raised center dome 58 is made of eight, pie-shaped panels 59. FIG. 5 shows an alternative bowl container 11 that uses a coaxially aligned gap ring 71 that abuts the inside edges of the curved panels 60. The inside edge of the gap ring 71 abuts a smaller diameter center dome 58′ made up of sixteen pie-shaped panels 59′ and a center plate 61.

[0047] As shown in FIGS. 5, 6, 7, 10, attached to the inside surface of the curved panels 60 are elongated rubber paddles 70. The paddles 70 are evenly spaced apart over the inside surface of the sidewall 14 of the bowl container 11 and used to force the water 142 to rotate with the rotating bowl container 11. In the embodiment shown, the paddles 70 are curved and extend approximately 2 to 3 inches upward from the inside surface of the curved panels 60.

[0048] Located adjacent to the rigid frame 34 is a drive mechanism 50 that includes a drive motor 52, a drive wheel 53, and a drive motor frame 54. The axis of the drive motor 52 is configured to rotate over the drive flange 46 to rotate the bowl container 11. When the drive motor 52 is activated, the drive wheel 53 presses against the drive flange 46 causing the entire bowl container 11 to rotated. In the embodiment shown, the drive motor 52 is connected to a control module 56 operated by an operator that manually adjusts switches that control the rate of rotation of the bowl container 11.

[0049] Attached to the distal ends of the diagonal member 40 and the inside curved member 38 is a horizontal top bracket 39. Attached to the top edge of the top bracket 39 is the upper flange 18. The inside section 19 of the upper flange 18 extends inward and hangs over inside surface of the curved panels 60 approximately 8 to 12 inches.

[0050] As stated previously, the proximal ends of the beams 36 are attached to the hub assembly 24. The hub assembly 24, shown more clearly in FIG. 8, includes an upper plate 25, a center spindle 27, and a lower ground plate 28. During assembly, the lower ground plate 28 is affixed to a support surface 300 via connectors 29. A thrust bearing (not shown) is disposed between the upper plate 24 and the center spindle 25 that enable the upper plate 24 to rotate around the spindle 25. Mounted on the upper plate 25 are thirty-two brackets 26 that connect to the beams 36 attaching the proximal ends of the beams 36 to the upper plate 24. The spindle 25 extends upward and beyond the upper plate 25. Attached to the upper end of the spindle 25 are ribs 32 that extend diagonally downward and connect to a beam 35. The panels 59, 59′ used on the center domes 58,58′ respectively, are then attached to the ribs 32.

[0051] During assembly, adjacent curved panels 60 overlap and connected to a curved member 38. Suitable connectors may be used to attach the longitudinal edges of the curved panels 60 to the curved members 38. A suitable adhesive/sealant may be used between the curved panels 60 and between the abutting edges of the curved panels 60 and the gap ring 71 and the pie-shaped panels 58. 58′. After assembly, the bowl container 11 is a watertight vessel.

[0052] The bowl container 11 in FIGS. 1-5 measures 18.5 feet in diameter. The vertical height of the sidewall 14 formed by the curved panels 60 is approximately 5 feet. Formed on the inner section of the bowl container 11 is a large conical dome 58 or small conical dome 58′. The curved panels 60 curve upward and terminates at the upper flange 18. Each curved panel 60 is triangular or pie-shaped and includes a lower curved edge that either abuts the gap ring 71 or abuts the panels 59′ used the small conical dome 58′.

[0053] As stated above, when the bowl container 11 is rotated, forces exerted in the water 142 creates parabolic waveforms 150 that surfer 200 rides. The face angle (a) of the parabolic waveform 150 and the depth (d) of the parabolic waveform 150 relative to the curved panel 60, varies depending on the rotation speed of the drive motor 52. The relation is shown more clearly in FIGS. 11-16 which are illustrations showing how the water 142 is forced outward in the bowl container 11 and form different parabolic waveforms 150 as the bowl container 11 is rotated at different rates.

[0054] It should be noted that the drive mechanism 50 and the diameter of the bowl container 11 and the slope, height, and curvature of the sidewall 14 are configured so the bowl container 11 when partially filled with water may be safety rotate between 0 and 11 RPM. The rotation of the bowl container 11 may be increased to compensate for drag resistance created by the surfer 200. FIG. 11 shows the bowl container 11 filed with approximately 10 to 15% full is at rest (RPM=0), so the water 142 covers and settles to the bottom section of the bottom container 11. As rotation of the bowl container 11 is increased, centrifugal forces are exerted on the water 142 causing it to flow outward over the sidewall 14 and form a relatively shallow parabolic waveform 150. As rotation of the bowl container 11 increases, (RPM's 7 and 8), the shape of the parabolic waveform 150 also changes (see FIGS. 12 and 13, respectively).

[0055] FIG. 14, shows the shape of the parabolic waveform 150 when the bowl container is rotated at 9 RPM. The parabolic waveform 150 flattens out along the sidewall 14 and the upper, outer edge of the parabolic waveform 150 contacts the bottom surface of the upper flange 18. At this rotation speed, the face angle of the parabolic waveform 150 is approximately 30 degrees. Also, the depth (or distance ‘d’) is of the parabolic waveform 150 immediately below the front edge of the upper flange 18 to the inside surface of the sidewall 14 located immediately blow the front edge is approximately 12 inches.

[0056] FIG. 15 depicts the shape of the parabolic waveform 150 when the bowl container 11 is rotated at 10 RPM. The horizontal thickness of the upper edge of the parabolic waveform 150 is approximately equal to the width of the upper flange 18. The face angle of the parabolic waveform 150 is approximately 32 degrees. The depth of the parabolic waveform 150 from the inside edge of the upper flange 18 to the inside surface of the sidewall 14 immediately below the front edge of the upper flange 18 is approximately 14 inches

[0057] FIG. 16 depicts the shape of the parabolic waveform 150 when the bowl container 11 is rotated at 11 RPM. At this rate of rotation, the upper flange prevents the parabolic waveform 150 from flowing over the upper flange 18. The face angle of the parabolic wave form is increased to approximately 34 degrees. Also, the depth of the parabolic waveform 150 from the inside edge of the upper flange 18 to the inside surface of the curved panel 60 is approximately 16 inches.

[0058] During use, the operator adjusts the rotational rate of the bowl container 11 to create parabolic waveforms 150 with different front face angles (a) and different to depths (d). More skilled surfers 200 prefer higher face angles. Also, because most surfboards include fins that extend downward from their bottom surfaces, parabolic waveforms 150 with greater depths are desirable to prevent the fins from contacting the paddles 70 and sidewall 14.

[0059] All embodiments of the wave machine 8 may include a non-rotating island 90 placed in the middle of the bowl container 11. The island 90 may be attached to tethers 91, to a gangway, or a central post that keeps the island 90 from rotating with the bowl container 11. In the embodiment shown in the FIGS, the island 90 is similar to a floating dock or raft that includes a covering made of watertight padding or foam material for safety from fall or impact. During operation, the island 90 floats on the slow rotating water 142 in the middle of the bowl container 11. One advantage of using a floating island is the island 90 automatically readjusts its position to the optimum operational water level at various rotational speeds.

[0060] The island 90 can also be constructed of structural elements of galvanized steel or fiberglass supported by a central support post 91 that extends upward through the hub assembly 24 and mounted to the floor or ground below (see FIG. 8). The post 91 is sealed against leaks with a rotating seal like bearing seals in hub assembly 24. The island 90 is attached to the post 91 at the optimum level to match the best operational rotation speeds.

[0061] FIG. 17 is a top perspective view of the bowl container 11 partially filled with water 142 that includes an optional coaxially aligned island 90, an optional first walkway 93 located around the perimeter of the bowl container 1 and an optional second walkway 96 that leads from the first walkway 93 to the island 90. Extending around the first walkway 93 is a handrail 97. The first walkway 93 and handrail 97 are supported on a support surface by vertical poles 94. A ladder 92 is provided that enables the surfer 200 to climb up to the first walkway 93. A platform 95 is provided that allows the surfer 200 to travel from the first walkway 93 to the second walkway 96, and then onto the island 90. The legs used on the second walkway 96 rest on the island 90 and used to hold the island 90 in place in the bowl container 11.

[0062] FIGS. 18 and 19 are views of the bowl container 11 shown in FIG. 17 without water that includes an optional water filtration system 80 that includes a water pump/filter tank 82, a collection tank 84, an ingress conduit 87, an egress conduit 88, and a water tunnel generator 89 located adjacent to said upper edge of the bowl container 11. During use, water 142 is removed from the container 11 and travels via the ingress conduit 87 to the holding tank 84. The water 142 from the holding tank 84 is then delivered to the water/pump filter tank 82. Water from the water/pump filter tank 82 is then delivered to the water tunnel generator 89 via the egress conduit 88. When water 142 flows over the water tunnel generator 89, an ocean-like wave tunnel is formed that surfers 200 may surf under.

[0063] As stated previously, the embodiment shown in FIGS. 1-19 use a container 11 configured to be used with water 142. It should be understood the invention could be used with a fluidized bed 120 made of sand granules 121 used in place of water 142. FIGS. 21 and 22 are views of a second rotating container 118 configured to be filled with sand granules 121 that form a fluidized bed 120. The container 118 is similar to bowl container 11 and configured rotate in the same manner. Mounted on the inside surface of the curved panels 60 are plurality of radially aligned air conduits 122. Each air conduit 122 is attached to a swiveling main manifold 127 that connects to a main conduit 127 that connects to an air pressure source 126.

[0064] FIG. 23 is a top perspective view of an air conduit 122 that includes a plurality of perpendicularly aligned branches 124. Formed on the air conduit 122 and branches 124 are holes 125. FIG. 24 illustrates air 128 from the air conduit 122 and branches 124 being released and causing the granules 121 to form the fluidized bed 120.

[0065] FIG. 20 is a section view of the container 118 partially filled particles 121 that are fluidized and the container 118 is rotated to form a parabolic waveform 150 in the fluidized bed 120.

[0066] FIGS. 25-27 shows another embodiment of the wave machine, hereinafter referred to as a floating wave machine and indicated by reference number 160 configured to float in a large body of water 161. The floating wave machine 160 includes an outer ring 162 made of thirty-two pie shaped parabolic floats 164. The floats 164 are made of made of watertight materials, such as rotationally molded plastic, fiberglass, or welded metal and designed to provide buoyancy. The floats 164 may be foam filled to limit water intrusion therein.

[0067] The ring 162 is attached to a radially aligned rib 186. The ribs 186 are attached to a center hub 185. The hub 185 is connect to a drive motor. 189.

[0068] Each float 164 includes a curved inside surface 169 configured to form a parabolic waveform 150 similar to the parabolic waveform 150 when water travels over the inside surface 169. The ring 162 is tethered to a dock 166 by a gangway 168 with ingress and egress ladders and a centrally located, non-rotating island platform 170. The surfer 200 uses the non-rotating island 170 to sit on while he positions himself and surfboard against the rotating parabolic waveform 150. The surfer 200 may use a lanyard (not shown) to pull himself up into a standing or surfing position where he rides the parabolic waveform face in successive turning motions.

[0069] Formed on the bottom of the floats are a plurality of water chutes 184. Attached to each water chute is a linear actuator 186. The actuators 186 are coupled to a sensor (not shown) configured to monitor the flow of water into the chute 184 and the formation of the parabolic waveform 150.

[0070] As shown in FIG. 28, the parabolic waveform 150 is formed as water from the surface of the large body of water 162 is scooped up by water chutes 184. The water then flows onto the inside diameter of the floats 164. Formed on the top surface of the floats is an upper flange. As water collects against the inwardly formed upper flange it can overflow to the outside diameter flowing down the outside of the float ring and returning to the surface of the large body of water 161.

[0071] During operation, water flows continuous upward and over flowing water produces an upslope flow that enhances the circular flow of the ring 162 so the surfer 200 can let go of the lanyard tow rope and surf down the upward flowing water which provides momentum used to propel the surfboard upstream against the rotating flow. When the surfer 200 falls, he travels around the rotating bowl with his surfboard until he climbs back onto the island 170 retrieves his board and resumes the ride or gives another rider a turn.

[0072] FIG. 28 is an enlarged, sectional view of the outer container and the island 170 used in the wave machine 160 shown in FIG. 25.

[0073] FIGS. 29 and 30 disclose another embodiment, called a bowl-in-a-bowl system, indicated by the reference number 225, that utilizes two bowl shaped containers 230, 240 to contain a controlled volume of water with in the first non-rotating outer bowl container 230 while the second inner rotating bowl container 240 is rotated to form a parabolic waveform 150. The inward sloping top flange 232 of the outer bowl container 230 contains the water pushed up the sidewall 226 forming a parabolic waveform 150. The inner bowl container 230 has holes 242 so that it neutrally ballasts where it is slightly heavier than water and floats within the water column, so the centrifugal force generated by the rotation holds the inner bowl near the surface of the outer bowl. The smaller diameter of the inner bowl container 240 keeps the inner bowl container 240 from scraping against the outer bowl container 230. The friction of the water 250 against the rotating inner bowl container 240 cause the water to move up the sidewall of the outer bowl container 230 forming a parabolic waveform 150.

[0074] The container 225 moves all the load caring structural elements to the non-rotating bowl container 240 with no weight carrying capacity needed for the rotating inner bowl container 230. The inner bowl container 230 can therefore be made of flexible or lightweight materials only strong enough to resist torque and rotational loads. This bowl-in-a-bowl embodiment 225 simplifies construction because the load carrying structural elements need not handle rotational loads combined with water weight loads and the structure can be mounted to the ground further enhancing and simplifying the structure.

INDUSTRIAL APPLICABILITY

[0075] This invention has application in the sports training industry. This invention has application in the wave boarding and wave surfing training industries.