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A fin box for a water craft including: a fin box body having an elongated slot open at a first surface of the fix box and extending to a closed base of the fin box; a peripheral flange extending outwardly from the slot and defining an area of the first surface around the slot; the peripheral flange

A fin box for a water craft including: a fin box body having an elongated slot open at a first surface of the fix box and extending to a closed base of the fin box; a peripheral flange extending outwardly from the slot and defining an area of the first surface around the slot; the peripheral flange having a second lower surface and a third upper surface both offset vertically from the first surface and extending laterally from the fin box body, the second lower surface and said third upper surface further comprising a left and right side, each said left and right side surfaces extending transversely from the body portion to peripheral extremities of said peripheral flange, wherein at least one surface of said peripheral flange forms a transverse angle of taper with an axial median vertical plane of the fin box body.

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1. A fin box to be inserted in an underside of a water craft and for releaseably attaching a fin to the water craft, said fin box comprising: a body portion including a left sidewall, a right sidewall and an elongated slot between the left and right sidewalls, wherein the elongated slot is open at a

1. A fin box to be inserted in an underside of a water craft and for releaseably attaching a fin to the water craft, said fin box comprising: a body portion including a left sidewall, a right sidewall and an elongated slot between the left and right sidewalls, wherein the elongated slot is open at a first surface of said body portion and said elongated slot extends down between the sidewalls to a base in the body portion, wherein the base extends between the left and right sidewalls, and the extended slot has a median plane extending the length of the extended slot;a peripheral flange extending transversely from said body portion, a first portion of said flange defining an area of said first surface around said elongated slot;a second portion of said flange including a second lower surface and a third upper surface, said second surface and third surface are both offset from said first surface towards the base, and the second portion extends transversely from said body portion, wherein the second portion includes a left side extending transversely from the left sidewall and a right side extending transversely from the right sidewall, andsaid second lower surface and said third upper surface each extends to a peripheral extremity of said peripheral flange;wherein at least one of the second lower surface and the third upper surface of said peripheral flange is tapered at a transverse angle with the median plane, said taper being uniformly distributed across a width of at least one of the surfaces of said second portion of the peripheral flange. 2. The fin box of claim 1 wherein said body portion of said fin box is configured to be inserted into a body portion recess in a core of said water craft and said peripheral flange is configured to nest in a peripheral recess around said body portion recess. 3. The fin box of claim 1 wherein: said third upper surface of the right side of the second portion of the peripheral flange forms the transverse angle of taper with said median plane of said body portion, andsaid third upper surface of said left side of the second portion -forms a right angle with the median plane;said third upper surface of the left side of the second portion is configured to abut a surface of a peripheral recess in the water craft; andsaid second lower surface of the left side of the second portion forms the transverse angle of taper with the median plane. 4. The fin box of claim 2 wherein: said third upper surface of said right side of the second portion forms the transverse angle of taper with said median plane;said third upper surface of the right side of the second portion is configured to abut a surface of a peripheral recess in the water craft, wherein the peripheral recess is adjacent the body portion recess;the second lower surface of said of the left side of the second portion forms the transverse angle of taper with said median plane of said body portion, andsaid second lower surface of the left side of the second portion is configured to abut an inner surface of a skin of said water craft. 5. The fin box of claim 2 wherein the third upper side surface on the left side forms the transverse angle of taper with said median plane of said body portion; said third upper surface on said left side of the second portion is configured to abut a surface of said peripheral recess;a the second lower surface on the right side of the second portion forms the angle of taper with said median plane of said body portion, andsaid second lower surface on the right side is configured to abut an inner surface of a glassed skin of said water craft. 6. The fin box of claim 1 wherein the third upper surface on the right side of the second portion forms the angle of taper with said median plane; the third upper surface of the left side of the second portion forms the angle of taper with said median plane;the second lower surface on the right side of the second portion forms the angle of taper with said median plane, andthe second lower surface of said left side of the second portion forms the angle of taper with said median plane. 7. The fin box of claim 2 wherein: the third upper surface of the left side of said second portion of the peripheral flange forms a right angle with said median plane of said body portion;said third upper surface of the left side of the second portion is configured to abut a surface of a peripheral recess in the core, wherein the peripheral recess is adjacent to the body recess;the second lower surface of said left side of the second portion forms the angle of taper with said median plane, andthe second side surface of the left side of the second portion is configured to abut an inner surface of a glassed skin of said water craft. 8. The fin box of claim 2wherein the third upper surface of said right side of the second portion of the peripheral flange forms a right angle with said median plane of said body portion;said third upper surface of the right side of the second portion is configured to abut a surface of a peripheral recess in the core, wherein the peripheral recess is adjacent to the body recess;the second lower surface of right side of said second portion forms the angle of taper with said median plane, andsaid second lower surface of right side of the second portion is configured to abut an inner surface of a glassed skin of said water craft. 9. The fin box of claim 2 wherein: the third upper surface of the left side of the second portion of said peripheral flange forms the angle of taper with said median plane;said third upper surface of the left side of the second portion is configured to abut a surface of a peripheral recess in the core, wherein the peripheral recess is adjacent to the body recess;the second lower surface of the left side of said second portion forms the angle of taper with said median plane; andsaid second lower surface of the left side of the second portion is configured to abut an inner surface of a glassed skin of said water craft. 10. The fin box of claim 1 wherein said elongated slot includes at least two elongated slots separated by a transverse strengthening rib in the fin box. 11. A releasable fin assembly including a fin box insertable in an underside of a water craft and releasibly attaching a fin to the water craft, said fin box comprising: a body portion including a left sidewall and a right sidewall between which are an elongated slot open at a first surface of said body portion and said elongated slot extending between the sidewalls to a base spanning between the left and right sidewalls of the body portion, wherein the slot defines a median plane extending lengthwise through the slot and between the left and right sidewalls;a peripheral flange extending transversely from said body portion, a first portion of said flange defining an area of said first surface around said elongated slot;a second portion of said flange including a left side extending transversely from the left sidewall and a right side extending transversely from the right sidewall, the left side and the right side each include a second lower surface and a third upper surface, said second portion is offset from said first surface in a direction towards the base, andsaid second lower surface and said third upper surface of each of the left side and the right side of the second portion extend transversely from the body portion to a peripheral extremity of said peripheral flange;wherein at least one of the second lower surface and the third upper surface is tapered at an angle transverse to the median plane, said taper being uniformly distributed across a width of at least one of the surfaces of said peripheral flange, andsaid fin includes a foil section and a fin tab section, said fin tab section of the fin includes an elongated screw retaining recess on at least one side of the fin tab section, said fin is retained in the elongated slot by at least one screw driven through at least one angled screw hole extending from a first surface of said fin box to at least one internal surface of said left or right sidewalls of the elongated slot and said screw engaging with a fin tab of a fin inserted in said elongated slot. 12. The releasable fin assembly of claim 11 wherein an overall length of the fin tab section is shorter than an overall length of the elongated slot of the fin box, and said at least one screw abuts the elongated screw retaining recess of the fin tab. 13. The releasable fin assembly of claim 11 wherein said screw is a stainless steel screw, and said screw includes an unthreaded head portion and a threaded shank portion. 14. The releasable fin assembly of claim 13 wherein said at least one angled hole includes a threaded portion and a recessed portion slightly larger than a root diameter of said threaded portion; said recessed portion configured to accommodate said unthreaded head portion of a said screw, andsaid screw and said recessed portion are arranged to limit an extent to which said screw may be driven through said hole. 15. The releasable fin assembly of claim 14 wherein the fin tab of the fin contains at least one screw retention recess on at least one side of the fin tab. 16. The releasable fin assembly of claim 1 wherein said peripheral flange includes perforations in at least one of the left or right sides of the second portion of the said peripheral flange, said perforations arranged in a pattern forming a slot or identifying mark or logo. 17. The fin box of claim 1 wherein said peripheral flange includes grooves on at least one of the second lower surface and the third upper surface of the second portion of the peripheral flange. 18. A fin box for a water craft comprising: a fin box body including left and right sidewalls, and an elongated slot between the sidewalls, wherein the slot is open at a first surface of the fin box and extends down into the fin box body to a base of the fin box and the slot has an median plane extending the length of the slot;the peripheral flange including left side portion extending outwardly from the left sidewall and a right side portion extending outwardly from the right sidewall, the left side and right side portions each include a lower surface and an upper surface opposite to the lower surface, wherein the lower surface and the upper surface of the left side portion extend from the left sidewall to a periphery of the left side portion, and the lower and upper surface of the right side portion extend from the right sidewall to a periphery of the right side portion, wherein the peripheral flange is offset from the first surfacewherein at least one of the lower surface and the upper surface of each of the left side portion and the right side portion is tapered to form a transverse angle of taper with the median plane. 19. A fin box for releaseably attaching a fin to a water craft, said fin box comprising: a body portion configured to be inserted into a recess in the water craft, the body portion including left and right sidewalls, a bottom extending between the sidewalls, and slot defined by the sidewalls and bottom, wherein the slot is open at an upper end of the body portion, wherein the slot includes a median plane extending lengthwise along the slot and the slot is configured to receive the fin;a peripheral flange extending transversely from said body portion, wherein a first portion of said flange defining a surface area of the body portion adjacent the opening of the slot;a second portion of said flange is offset from the first portion of the peripheral flange towards the bottom of the body portion, wherein the second portion includes a right side section extending transversely from the right sidewall and a left side section extending transversely from the left sidewall, andat least one surface of the right side section and the left side section of the second portion is tapered at an angle transverse to the median plane, wherein the taper of at least one surface is uniform across length of the at least one surface which extends the length of the body portion and a width of the at least one surface which extends from one of the sidewalls to a peripheral edge of the flange.