A wing, buoyant in water has an upper wing surface comprising a deck upon which a rider stands, and, the wing is in water. A foot constraint proximate the wing leading edge and fixedly attaching the wing projects outwardly from the deck to release-ably receive the rider's forward foot. With the rider standing with both feet upon the deck, and the rider's forward foot ensconced within the foot constraint, and with the rider's aft foot proximate a trailing edge of the wing, the rider bodily heaves and pitches the wing to obtain a chordwise forward velocity thru the water. The forward foot constraint enables the rider to upheave the wing. A second foot constraint may attach the deck proximate the wing trailing edge. Another foot constraining system is comprised as a frictional device broadly applying the deck, and, may be used in addition to or in lieu of other constraints.

A wing, buoyant in water has an upper wing surface comprising a deck upon which a rider stands, and, the wing is in water. A foot constraint proximate the wing leading edge and fixedly attaching the wing projects outwardly from the deck to release-ably receive the rider's forward foot. With the rider standing with both feet upon the deck, and the rider's forward foot ensconced within the foot constraint, and with the rider's aft foot proximate a trailing edge of the wing, the rider bodily heaves and pitches the wing to obtain a chordwise forward velocity thru the water. The forward foot constraint enables the rider to upheave the wing. A second foot constraint may attach the deck proximate the wing trailing edge. Another foot constraining system is comprised as a frictional device broadly applying the deck, and, may be used in addition to or in lieu of other constraints.

A manufacturing method contemplates performing vacuum-assisted resin infusion to enclose an elongated core within a cured composite laminate without employing a mold. Not relying upon an external mold enables the process to be efficiently performed for core shapes that are manufactured in low volumes. Typical resin infusion processes utilize flow media that induces bag bridging during vacuum draw in order to provide gaps facilitating resin flow. However, popular flow media also tends to impart directional aggregate forces during vacuum draw, which forces can deform the core since no mold is being used. To avoid unequal and non-dispersed directional forces from deforming the elongated core, a flow media is employed that is configured to disperse and/or reduce such forces. Some such flow media may be knitted so as to allow overlapping strands to slide over one another. Other flow media may ensure that strands are interleaved so that no one strand or group of strands is disposed outwardly of other strands along a substantial length of the strands, thus dispersing bag bridging forces in several directions and avoiding directional aggregate forces. However, such flow media may have inhibited resin flow relative to popular high-flow flow media, and thus new strategies have been developed to ensure appropriate wetting of fibrous reinforcement. An adjustable brace can also be employed to restrain the elongated core from deflecting during application of vacuum and/or resin infusion.

A manufacturing method contemplates performing vacuum-assisted resin infusion to enclose an elongated core within a cured composite laminate without employing a mold. Not relying upon an external mold enables the process to be efficiently performed for core shapes that are manufactured in low volumes. Typical resin infusion processes utilize flow media that induces bag bridging during vacuum draw in order to provide gaps facilitating resin flow. However, popular flow media also tends to impart directional aggregate forces during vacuum draw, which forces can deform the core since no mold is being used. To avoid unequal and non-dispersed directional forces from deforming the elongated core, a flow media is employed that is configured to disperse and/or reduce such forces. Some such flow media may be knitted so as to allow overlapping strands to slide over one another. Other flow media may ensure that strands are interleaved so that no one strand or group of strands is disposed outwardly of other strands along a substantial length of the strands, thus dispersing bag bridging forces in several directions and avoiding directional aggregate forces. However, such flow media may have inhibited resin flow relative to popular high-flow flow media, and thus new strategies have been developed to ensure appropriate wetting of fibrous reinforcement. An adjustable brace can also be employed to restrain the elongated core from deflecting during application of vacuum and/or resin infusion.

A modular, weight-shift controlled watercraft device is disclosed which includes: a modular board removably attachable to a power system. The power system includes a modular power supply system, and a modular propulsion system. The power supply system includes a housing including a battery. The propulsion system includes a modular strut, a modular propulsion pod, and a modular hydrofoil. In one embodiment, the power supply system is removably and mechanically attachable directly to the propulsion system.

A modular, weight-shift controlled watercraft device is disclosed which includes: a modular board removably attachable to a power system. The power system includes a modular power supply system, and a modular propulsion system. The power supply system includes a housing including a battery. The propulsion system includes a modular strut, a modular propulsion pod, and a modular hydrofoil. In one embodiment, the power supply system is removably and mechanically attachable directly to the propulsion system.

The present invention provides a surf board, comprising a body, and a bottom board layer and a protective layer which are respectively arranged at the two sides of the body; the body comprises a first fiber glass fiber layer arranged on the bottom board layer, an inner core arranged on the first fiber glass layer and a second fiber glass layer arranged on the inner core and connected with the protective layer; the second fiber glass layer is provided with two layers. In the present invention, the bottom board layer is arranged at the lower end of the body, so that the bottom of surf board is firmer. The protective layer is arranged at the upper end of the body, so that the surface of the surf board is protected and is prevented from being damaged due to strong water pressure when the surf board is used.

The present invention provides a surf board, comprising a body, and a bottom board layer and a protective layer which are respectively arranged at the two sides of the body; the body comprises a first fiber glass fiber layer arranged on the bottom board layer, an inner core arranged on the first fiber glass layer and a second fiber glass layer arranged on the inner core and connected with the protective layer; the second fiber glass layer is provided with two layers. In the present invention, the bottom board layer is arranged at the lower end of the body, so that the bottom of surf board is firmer. The protective layer is arranged at the upper end of the body, so that the surface of the surf board is protected and is prevented from being damaged due to strong water pressure when the surf board is used.

Methods of tracing a lengthwise half of a board sports board and applying a substrate film cutout onto the board having the steps of centering a centerline of a tracing scale onto a center of the board, the tracing scale having an off-centerline on both sides of the centerline; aligning a centerline mark of the film with the off-centerline of the tracing scale; flipping the board over such that the board is on top of the film; tracing a trace outline of half of the board onto the film, such that the half of the trace outline is incrementally larger or smaller than the half of the board; removing a release liner from the trace outline to expose an adhesive in the film; wetting the adhesive with a solution of water and liquid soap; flattening the wetted film onto the board with a spreader; and wiping with a wiping cloth.

Methods of tracing a lengthwise half of a board sports board and applying a substrate film cutout onto the board having the steps of centering a centerline of a tracing scale onto a center of the board, the tracing scale having an off-centerline on both sides of the centerline; aligning a centerline mark of the film with the off-centerline of the tracing scale; flipping the board over such that the board is on top of the film; tracing a trace outline of half of the board onto the film, such that the half of the trace outline is incrementally larger or smaller than the half of the board; removing a release liner from the trace outline to expose an adhesive in the film; wetting the adhesive with a solution of water and liquid soap; flattening the wetted film onto the board with a spreader; and wiping with a wiping cloth.