| 摘要 |
An improved stringer for a recreational board such as a water board or similar riding structure. The stringer has a center panel with side surfaces and at least one longitudinal cavity within its center panel. A hollow member is positioned within the longitudinal cavity. The hollow member has at least two ends and is closed at these ends. Within the hollow member is a fluid substance which is less in volume than a total volume of the hollow member which thereby permits the fluid substance to move back and forth within the hollow member which, by such movement, facilitates momentum, acceleration, leverage, and drive. The center panel may have one or more such cavities and fluid-filled hollow member. Depending on desired performance, these cavities with their fluid-filled hollow members may also be positioned adjacent to the sides of the center panel.
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