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A boat hull having an upper hull section, a pair of spaced apart substantially parallel elongated outer sponsons extending from a forward portion to a stern portion of a bottom of the upper hull section, the outer sponsons and upper hull section defining a tunnel therebetween; and an elongated cente

A boat hull having an upper hull section, a pair of spaced apart substantially parallel elongated outer sponsons extending from a forward portion to a stern portion of a bottom of the upper hull section, the outer sponsons and upper hull section defining a tunnel therebetween; and an elongated center sponson extending along the bottom of the upper hull and positioned in the tunnel between and substantially parallel to the pair of outer sponsons and having a forward section with an upwardly extending trailing step wall defining an upward step in the center sponson, and an aft section that is located aft of the forward section, the aft section having an upwardly curved leading edge intersecting the step wall of the forward section. The upper hull section can have planar bottom.

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A boat hull having an upper hull section, a pair of spaced apart substantially parallel elongated outer sponsons extending from a forward portion to a stern portion of a bottom of the upper hull section, the outer sponsons and upper hull section defining a tunnel therebetween; and an elongated cente

A boat hull having an upper hull section, a pair of spaced apart substantially parallel elongated outer sponsons extending from a forward portion to a stern portion of a bottom of the upper hull section, the outer sponsons and upper hull section defining a tunnel therebetween; and an elongated center sponson extending along the bottom of the upper hull and positioned in the tunnel between and substantially parallel to the pair of outer sponsons and having a forward section with an upwardly extending trailing step wall defining an upward step in the center sponson, and an aft section that is located aft of the forward section, the aft section having an upwardly curved leading edge intersecting the step wall of the forward section. The upper hull section can have planar bottom. y having a slider through slot arranged for said respective standing leg slidably passing through so as to guide said standing leg in a vertically movable manner. 4. A foldable furniture, as recited in claim 3, wherein a total length of said first and second side supporting arms of each side supporting unit is at least equal to a distance between a distance between said corresponding front and rear frame joints when said foldable frame is unfolded to stretch out, in such a manner that said first and second side supporting arms are pivotally and upwardly folded in a horizontal position so as to retain said foldable frame in an unfolded stretching manner. 5. A foldable furniture, as recited in claim 4, wherein said tension fabric further comprises a pair of holding devices to hold said two side portions of said tension fabric with said side supporting units respectively. 6. A foldable furniture, as recited in claim 5, wherein each of said holding devices comprises at least a tubular holding sleeve, having two open ends, provided on each side portion of a bottom surface of said tension fabric for first and second side supporting arms slidably passing through. 7. A foldable furniture, as recited in claim 6, wherein said tension fabric further comprises two pairs of tubular holding pocket, each having an open end, provided at corner portions of said bottom surface of said tension fabric respective in such a manner that said free end portions of said first and second side supporting arms are arranged to slidably insert into said holding pockets respectively, so as to tensely retain said tension fabric by the side supporting units. 8. A foldable furniture, as recited in claim 3, wherein each of said guiding holder further comprises a connecting wing, which is integrally extended from one side of said respective slider body, pivotally riveted to said respective side frame at a position where said first and second side frame legs are pivotally connected with each other. 9. A foldable furniture, as recited in claim 8, wherein a total length of said first and second side supporting arms of each side supporting unit is at least equal to a distance between a distance between said corresponding front and rear frame joints when said foldable frame is unfolded to stretch out, in such a manner that said first and second side supporting arms are pivotally and upwardly folded in a horizontal position so as to retain said foldable frame in an unfolded stretching manner. 10. A foldable furniture, as recited in claim 9, wherein said tension fabric further comprises a pair of holding devices to hold said two side portions of said tension fabric with said side supporting units respectively. 11. A foldable furniture, as recited in claim 10, wherein each of said holding devices comprises at least a tubular holding sleeve, having two open ends, provided on each side portion of a bottom surface of said tension fabric for first and second side supporting arms slidably passing through. 12. A foldable furniture, as recited in claim 11, wherein said tension fabric further comprises two pairs of tubular holding pocket, each having an open end, provided at corner portions of said bottom surface of said tension fabric respective in such a manner that said free end portions of said first and second side supporting arms are arranged to slidably insert into said holding pockets respectively so as to tensely retain said tension fabric by the side supporting units. 13. A foldable furniture, as recited in claim 12, wherein each of said side supporting units further comprises a pivot joint pivotally connecting said first and second side supporting arms with each other, wherein said pivot joint comprises a first joint member, having a stopper edge, firmly affixed to said first side supporting arm and a second joint member, having a second stopper edge, firmly affixed to said second side supporting arm, said first joint member being pivotally connected to said second jo int member while said first stopper edge of said first joint member is arranged to limit a pivotal movement of said second joint member and said second stopper edge of said second joint member is arranged to limit a pivotal movement of said first joint member, so that said first and second side supporting arms are allowed to upwardly fold in a horizontal position when said foldable frame is unfolded. 14. A foldable furniture, as recited in claim 4, wherein each of said side supporting units further comprises a pivot joint pivotally connecting said first and second side supporting arms with each other, wherein said pivot joint comprises a first joint member, having a stopper edge, firmly affixed to said first side supporting arm and a second joint member, having a second stopper edge, firmly affixed to said second side supporting arm, said first joint member being pivotally connected to said second joint member while said first stopper edge of said first joint member is arranged to limit a pivotal movement of said second joint member and said second stopper edge of said second joint member is arranged to limit a pivotal movement of said first joint member, so that said first and second side supporting arms are allowed to upwardly fold in a horizontal position when said foldable frame is unfolded. 15. A foldable furniture, as recited in claim 9, wherein each of said side sup porting units further comprises a pivot joint pivotally connecting said first and second side supporting arms with each other, wherein said pivot joint comprises a first joint member, having a stopper edge, firmly affixed to said first side supporting arm and a second joint member, having a second stopper edge, firmly affixed to said second side supporting arm, said first joint member being pivotally connected to said second joint member while said first stopper edge of said first joint member is arranged to limit a pivotal movement of said second joint member and said second stopper edge of said second joint member is arranged to limit a pivotal movement of said first joint member, so that said first and second side supporting arms are allowed to upwardly fold in a horizontal position when said foldable frame is unfolded. 16. A foldable furniture, as recited in claim 3, wherein said tension fabric further comprises a pair of holding devices to hold said two side portions of said tension fabric with said side 'supporting units respectively. 17. A foldable furniture, as recited in claim 16, wherein each of said holding devices comprises at least a tubular holding sleeve, having two open ends, provided on each side portion of a bottom surface of said tension fabric for first and second side supporting arms slidably passing through. 18. A foldable furniture, as recited in claim 16, wherein said tension fabric further comprises two pairs of tubular holding pocket, each having an open end, provided at corner portions of said, bottom surface of said tension fabric respective in such a manner that said free end portions of said first and second side supporting arms are arranged to slidably insert into said holding pockets respectively, so as to tensely retain said tension fabric by the side supporting units. 19. A foldable furniture, as recited in claim 1, wherein a total length of said first and second side supporting arms of each side supporting unit is at least equal to a distance between a distance between said corresponding front and rear frame joints when said foldable frame is unfolded to stretch out, in such a manner that said first and second side supporting arms are pivotally and upwardly folded in a horizontal position so as to retain said foldable frame in an unfolded stretching manner. 20. A foldable furniture, as recited in claim 1, wherein each of said side supporting units further comprises a pivot joint pivotally connecting said first and second side supporting arms with each other, wherein said pivot joint comprises a first joint member, having a