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A sectionalized sports board including a plurality of board sections and a post-tensioning apparatus incorporated into a board stringer and operatively disposed between the sections along the longitudinal axis of each section. The post-tensioning apparatus includes a post-tensioning cable slidably i

A sectionalized sports board including a plurality of board sections and a post-tensioning apparatus incorporated into a board stringer and operatively disposed between the sections along the longitudinal axis of each section. The post-tensioning apparatus includes a post-tensioning cable slidably inserted into a cable chase disposed in each of the board sections, and a cable tension adjustment for selectively coupling the sections into a configuration for use of the board or for separating the board sections so that they can be folded into a compact collapsed configuration. The post-tensioning cable is permanently anchored at its ends, and when the post-tensioning cable is in a stressed condition, the board sections are abutted to provide a useable and rigid board configuration, and when the post-tensioning cable is unstressed, the board sections may be folded into a compact collapsed configuration.

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1. A collapsible sectionalized sports board, comprising: a first section having a longitudinal axis;a second section separable from said first section and having a longitudinal axis; anda post-tensioning apparatus operatively disposed between said first and said second sections along the longitudina

1. A collapsible sectionalized sports board, comprising: a first section having a longitudinal axis;a second section separable from said first section and having a longitudinal axis; anda post-tensioning apparatus operatively disposed between said first and said second sections along the longitudinal axis of each of said first and said second section, said post-tensioning apparatus including a cable slidably inserted into a cable chase disposed in each of said first and second sections, and a cable tension adjustment for selectively coupling said sections into a configuration for use of the board in a sport or uncoupling said sections for folding said board sections into a compact collapsed configuration;wherein said post-tensioning apparatus is incorporated into a board stringer divided into a plurality of stringer segments, including a first segment disposed in said first section, and a second segment disposed in said second section;wherein said board stringer has a substantially rectangular cross sectional shape and said stringer segments generally correspond in length to the length of the board section into which it is incorporated;wherein said board stringer runs substantially the entire length of the longitudinal axis of said sports board when said board is in the functional configuration for use, and wherein said board stringer includes upper and lower bores which, when said sports board is assembled, function as a continuous or substantially continuous cable sheathing or chase into which said post-tensioning cable is slidably inserted. 2. The sports board of claim 1, wherein said first and second sections each include right and left panels in a side-by-side relationship, and wherein said post-tensioning apparatus is incorporated into a board stringer. 3. The sports board of claim 2, wherein said first section is a front section and said second section is a tail section, and further including a medial section disposed between said front and said tail sections, and wherein each of said sections includes a top side and a bottom side. 4. The sports board of claim 3, wherein said post-tensioning apparatus includes a permanently anchored cable with means to adjust the stress of said cable, and when said cable is unstressed, said board sections may be folded into a compact collapsed configuration in which said front section is folded onto either of said top or said bottom side of said medial section, and said tail section is folded onto said medial section on the side opposite the side onto which said front section is folded. 5. The sports board of claim 4, wherein said cable has two ends, and wherein in the collapsed configuration, said cable ends remain connected to at least one board section. 6. The sports board of claim 2, wherein said post-tensioning apparatus includes a permanently anchored cable slidably disposed within a cable sheath, and wherein when said cable is unstressed, said board sections may be folded into a compact collapsed configuration. 7. The sports board of claim 6, wherein said cable has two ends, and wherein in the compact collapsed configuration, said cable ends remain connected to at least one board section. 8. The sports board of claim 1, wherein said first section is a nose section, said second end is a tail section, and further including a medial section disposed between said nose section and said tail section, wherein said nose section includes a front end and a back end, said medial section includes a front end and a back end, and said tail section includes a front end and a back end, and wherein each of said front, medial, and back sections include a top side and a bottom side;and wherein when said cable is in a stressed condition, said back end of said nose section abuts said front end of said medial section and said back end of said medial section abuts said front end of said tail section, and when said cable is unstressed, said board sections may be folded into a compact collapsed configuration in which said front section is folded onto either of said top or said bottom side of said medial section, and said tail section is folded onto said medial section on the side opposite the side onto which said front section is folded. 9. The sports board of claim 1, further including torsion resisting elements. 10. The sports board of claim 9, wherein said torsion resisting elements comprise keyway features integrated into the adjoining portions of said first and said second sections. 11. The sports board of claim 10, wherein said keyway features include male torsion resistance key elements on at least one of said board sections adapted for matable insertion between female compression distributing shoulders formed as a rim around the exposed ends of the other of said board sections. 12. The sports board of claim 9, wherein said torsion resisting elements comprise indexing pins and holes integrated into the abutting ends of said first and said second sections. 13. The sports board of claim 9, wherein said torsion resisting elements comprise hook and loop fastener material disposed on the abutting ends of said first and said second sections. 14. The sports board of claim 9, wherein said torsion resisting elements comprise hook and loop fastener material and indexing pins and holes disposed on the abutting ends of said first and said second sections. 15. The sports board of claim 1, wherein said post-tensioning cable is fed through either of said upper or lower bores and routed over a return disposed in said first segment. 16. The sports board of claim 1, wherein said stringer is partially hollow in said second segment and includes a jacking block to which said post-tensioning cable is anchored and a jacking rod threadably coupled to said jacking block and rotatably journaled at one end of the rear end the stringer, said jacking rod having a jacking nut accessible from one end of said sports board, such that turning said jacking rod at said jacking nut results in longitudinal movement fore and aft of said jacking block and thereby adjusts the stress placed on said post-tensioning cable within said hollow portion of said second segment of said stringer. 17. The sports board of claim 16, wherein adjustment of said jacking rod by turning said jacking nut selectively increases or decreases separation of said first and second board sections such that the board may either be folded into a collapsed configuration or assembled into a rigid configuration for use.