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A composite structure has composite skin layers and at least two elongated stiffener/spacer composite members interposed between the skin layers. The stiffener/spacer composite members are arranged generally longitudinally of the skin layers in spaced-apart relation laterally. Each of the skin layer

A composite structure has composite skin layers and at least two elongated stiffener/spacer composite members interposed between the skin layers. The stiffener/spacer composite members are arranged generally longitudinally of the skin layers in spaced-apart relation laterally. Each of the skin layers is formed by assembling a layer of an uncured resin-impregnated fiber material on a forming surface of a jig. Each stiffener/spacer composite member is formed of an uncured resin-impregnated fiber material that is laid up over an elongated hollow mandrel of a stiffened fabric and is assembled to one of the uncured skin layers. The jigs are juxtaposed to form a sandwich with the assembled uncured composite layers, which are then vacuum-bagged and co-cured under a predetermined pressure and a predetermined temperature to render the structure unitary.

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1. A composite structure comprising first and second composite skin layers, each of a resin-impregnated fiber material, at least two elongated stiffener/spacer composite members, each of a resin-impregnated fiber material and interposed between the skin layers, each stiffener/spacer composit

1. A composite structure comprising first and second composite skin layers, each of a resin-impregnated fiber material, at least two elongated stiffener/spacer composite members, each of a resin-impregnated fiber material and interposed between the skin layers, each stiffener/spacer composite member being arranged generally longitudinally of the skin layers and the stiffener/spacer composite members being spaced apart laterally, each stiffener/spacer composite member having side walls extending between and united with the skin layers by base walls bonded to the inner faces of the skin layers, and an elongated hollow mandrel of a stiffened fabric received between and in engagement with the side walls of the of the stiffener/spacer composite member, and wherein the composite skin layers and stiffener/spacer composite members are co-cured under a predetermined pressure and a predetermined temperature to render the structure unitary.2. The composite structure of claim 1, wherein at least one of the stiffener/spacer composite members is generally hat shaped in cross section and has a generally U-shaped body portion having said side walls and a side flange portion forming one of said base walls extending from the end of each of the side walls of the U-shaped body.3. The composite structure of claim 1, wherein at least one of the stiffener/spacer composite members is tubular with the side walls joined by at least one of the base walls.4. The composite structure of claim 3, wherein the at least one tubular stiffener/spacer composite member has a generally U-shaped body portion and in-turned flange portions forming one of the base walls.5. The composite structure of claim 3, wherein the at least one tubular stiffener/spacer composite member is formed by helical plies of composite material wrapped around the mandrel.6. The composite structure of claim 1, wherein each hollow mandrel is formed of a unitary stiffened carbon fabric tape.7. The composite structure of claim 1, wherein at least one of the stiffener/spacer composite members is of uniform cross section along at least a portion of its length.8. The composite structure of claim 1, wherein at least one of the stiffener/spacer composite members is of non-uniform cross section along at least a portion of its length.9. The composite structure of claim 1, wherein both of the stiffener/spacer composite members are of non-uniform cross section along at least portions of their lengths.10. The composite structure of claim 1, wherein at least a portion of one of the stiffener/spacer composite members has a longitudinal axis that is curved.11. The composite structure of claim 1, wherein the width of at least one of the base walls of one of the stiffener/spacer composite members varies along at least a portion of its length.12. The composite structure of claim 1, wherein the heights of the side walls of at least one of the stiffener/spacer composite members are different along at least portions of their lengths.13. The composite structure of claim 1, wherein the height of at least one of the side walls of one of the stiffener/spacer composite members varies along at least a portion of its length.14. The composite structure of claim 1, wherein the stiffener/spacer members converge longitudinally along a least portions of their lengths.15. The composite structure of claim 1, wherein at least one of the skin layers is curved along at least a portion of its longitudinal extent.16. The composite structure of claim 1, wherein at least one of the skin layers is curved along at least a portion of its lateral extent.17. The composite structure of claim 1, wherein the top and bottom skin layers meet and are in engagement at a longitudinal edge juncture.18. The composite structure of claim 17, and further comprising an elongated composite member of wedge-shape in cross section and of a resin-impregnated fiber material received between and engaged with portions of the top and bottom skin laye rs adjacent the edge juncture.19. A composite structure comprising first and second composite skin layers, each of a resin-impregnated fiber material, at least two elongated stiffener/spacer composite members, each of a resin impregnated fiber material and interposed between the skin layers, each stiffener/spacer composite member being arranged generally longitudinally of the skin layers and the stiffener/spacer composite members being spaced apart laterally, each stiffener/spacer composite member having side walls extending between and united with the skin layers by base walls bonded to the inner faces of the skin layers, and an elongated hollow mandrel of a stiffened fabric received between and in engagement with the side walls of the of the stiffener/spacer composite member, wherein each hollow mandrel is formed of a unitary stiffened carbon fabric tape and whereinthe composite skin layers and stiffener/spacer composite members are co-cured under a predetermined pressure and a predetermined temperature to render the structure unitary.20. The composite structure of claim 19, wherein at least one of the stiffener/spacer composite members is generally hat-shaped in cross section and has a generally U-shaped body portion having said side walls and a side flange portion forming one of said base walls extending from the end of each of the side walls of the U-shaped body.21. The composite structure of claim 19, wherein at least one of the stiffener/spacer composite members is tubular with the side walls joined by at least one of the base walls, and the at least one tubular stiffener/spacer composite member has a generally U-shaped body portion and in-turned flange portions forming one of the base walls.22. The composite structure of claim 19, wherein at least one of the stiffener/spacer composite members is of non-uniform cross section along at least a portion of its length.23. The composite structure of claim 19, wherein both of the stiffener/spacer composite members are of non-uniform cross section along at least portions of their lengths.24. The composite structure of claim 19, wherein at least a portion of one of the stiffener/spacer composite members has a longitudinal axis that is curved.25. The composite structure of claim 19, wherein the width of at least one of the base walls of one of the stiffener/spacer composite members varies along at least a portion of its length.26. The composite structure of claim 19, wherein the heights of the side walls of at least one of the stiffener/spacer composite members are different along at least portions of their lengths.27. The composite structure of claim 19, wherein the height of at least one of the side walls of one of the stiffener/spacer composite members varies along at least a portion of its length.28. The composite structure of claim 19, wherein the stiffener/spacer members converge longitudinally along a least portions of their lengths.29. A composite structure comprising p 1 first and second composite skin layers, each of a resin-impregnated fiber material, at least two elongated stiffener/spacer composite members, each of a resin-impregnated fiber material and interposed between the skin layers, with each stiffener/spacer composite member being arranged generally longitudinally of the skin layers and the stiffener/spacer composite members being spaced apart laterally, each stiffener/spacer composite member having side walls extending between and united with the skin layers by base walls bonded to the inner faces of the skin layers, an elongated hollow mandrel of a stiffened fabric received between and in engagement with the side walls of the of the stiffener/spacer composite member, and wherein the composite skin layers and stiffener/spacer composite members are co-cured under a predetermined pressure and a predetermined temperature to render the structure unitary, and at least one of the stiffener/spacer composite members is generally hat shaped in cross section and has a generally U-shaped body portion having said side walls and a side flange portion forming one of said base walls extending from the end of each of the side walls of the U-shaped body. 30. A composite structure comprising first and second composite skin layers, each of a resin-impregnated fiber material, at least two elongated stiffener/spacer composite members, each of a resin-impregnated fiber material and interposed between the skin layers, each stiffener/spacer composite member being arranged generally longitudinally of the skin layers and the stiffener/spacer composite members being spaced apart laterally, with each stiffener/spacer composite member having side walls extending between and united with the skin layers by base walls bonded to the inner faces of the skin layers, an elongated hollow mandrel of a stiffened fabric received between and in engagement with the side walls of the of the stiffener/spacer composite member, and wherein the composite skin layers and stiffener/spacer composite members are co-cured under a predetermined pressure and a predetermined temperature to render the structure unitary, andat least one of the stiffener/spacer composite members is tubular with the side walls joined by at least one of the base walls.31. The composite structure of claim 30, wherein the at least one tubular stiffener/spacer composite member has a generally U-shaped body portion and in-turned flange portions forming one of the base walls.32. The composite structure of claim 30, wherein the at least one tubular stiffener/spacer composite member is formed by helical plies of composite material wrapped around the mandrel.33. A composite structure comprising first and second composite skin layers, each of a resin-impregnated fiber material, at least two elongated stiffener/spacer composite members, each of a resin-impregnated fiber material and interposed between the skin layers, each stiffener/spacer composite member being arranged generally longitudinally of the skin layers and the stiffener/spacer composite members being spaced apart laterally, with each stiffener/spacer composite member having side walls extending between and united with the skin layers by base walls bonded to the inner faces of the skin layers, an elongated hollow mandrel of a stiffened fabric received between and in engagement with the side walls of the of the stiffener/spacer composite member, and wherein the composite skin layers and stiffener/spacer composite members are co-cured under a predetermined pressure and a predetermined temperature to render the structure unitary, andeach hollow mandrel is formed of a unitary stiffened carbon fabric tape.34. A composite structure comprising first and second composite skin layers, each of a resin-impregnated fiber material, at least two elongated stiffener/spacer composite members, each of a resin-impregnated fiber material and interposed between the skin layers, each stiffener/spacer composite member being arranged generally longitudinally of the skin layers and the stiffener/spacer composite members being spaced apart laterally, with each stiffener/spacer composite member having side walls extending between and united with the skin layers by base walls bonded to the inner faces of the skin layers, and an elongated hollow mandrel of a stiffened fabric received between and in engagement with the side walls of the of the stiffener/spacer composite member, and wherein the composite skin layers and stiffener/spacer composite members are co-cured under a predetermined pressure and a predetermined temperature to render the structure unitary, andat least one of the stiffener/spacer composite members is of non-uniform cross section along at least a portion of its length.35. A composite structure comprising first and second composite skin layers, each of a resin-impregnated fiber material, at least two elongated stiffener/spacer composite members, each of a resin-imp regnated fiber material and interposed between the skin layers, each stiffener/spacer composite member being arranged generally longitudinally of the skin layers and the stiffener/spacer composite members being spaced apart laterally, each stiffener/spacer composite member having side walls extending between and united with the skin layers by base walls bonded to the inner faces of the skin layers, and an elongated hollow mandrel of a stiffened fabric received between and in engagement with the side walls of the of the stiffener/spacer composite member, and wherein the composite skin layers and stiffener/spacer composite members are co-cured under a predetermined pressure and a predetermined temperature to render the structure unitary, and both of the stiffener/spacer composite members are of non-uniform cross section along at least portions of their lengths. 36. A composite structure comprising first and second composite skin layers, each of a resin-impregnated fiber material, at least two elongated stiffener/spacer composite members, each of a resin-impregnated fiber material and interposed between the skin layers, each stiffener/spacer composite member being arranged generally longitudinally of the skin layers and the stiffener/spacer composite members being spaced apart laterally, each stiffener/spacer composite member having side walls extending between and united with the skin layers by base walls bonded to the inner faces of the skin layers, and an elongated hollow mandrel of a stiffened fabric received between and in engagement with the side walls of the of the stiffener/spacer composite member, and wherein the composite skin layers and stiffener/spacer composite members are co-cured under a predetermined pressure and a predetermined temperature to render the structure unitary, and at least a portion of one of the stiffener/spacer composite members has a longitudinal axis that is curved. 37. A composite structure comprising first and second composite skin layers, each of a resin-impregnated fiber material, at least two elongated stiffener/spacer composite members, each of a resin-impregnated fiber material and interposed between the skin layers, each stiffener/spacer composite member being arranged generally longitudinally of the skin layers and the stiffener/spacer composite members being spaced apart laterally, each stiffener/spacer composite member having side walls extending between and united with the skin layers by base walls bonded to the inner faces of the skin layers, and an elongated hollow mandrel of a stiffened fabric received between and in engagement with the side walls of the of the stiffener/spacer composite member, and wherein the composite skin layers and stiffener/spacer composite members are co-cured under a predetermined pressure and a predetermined temperature to render the structure unitary, and wherein the width of at least one of the base walls of one of the stiffener/spacer composite members varies along at least a portion of its length. 38. A composite structure comprising first and second composite skin layers, each of a resin-impregnated fiber material, at least two elongated stiffener/spacer composite members, each of a resin-impregnated fiber material and interposed between the skin layers, each stiffener/spacer composite member being arranged generally longitudinally of the skin layers and the stiffener/spacer composite members being spaced apart laterally, each stiffener/spacer composite member having side walls extending between and united with the skin layers by base walls bonded to the inner faces of the skin layers, and an elongated hollow mandrel of a stiffened fabric received between and in engagement with the side walls of the of the stiffener/spacer composite member, and wherein the composite skin layers and stiffener/spacer composite members are co-cured under a predetermined pressure and a predetermined temperature to render the struct ure unitary, and the heights of the side walls of at least one of the stiffener/spacer composite members are different along at least portions of their lengths. 39. A composite structure comprising first and second composite skin layers, each of a resin-impregnated fiber material, at least two elongated stiffener/spacer composite members, each of a resin-impregnated fiber material and interposed between the skin layers, each stiffener/spacer composite member being arranged generally longitudinally of the skin layers and the stiffener/spacer composite members being spaced apart laterally, each stiffener/spacer composite member having side walls extending between and united with the skin layers by base walls bonded to the inner faces of the skin layers, and an elongated hollow mandrel of a stiffened fabric received between and in engagement with the side walls of the of the stiffener/spacer composite member, and wherein the composite skin layers and stiffener/spacer composite members are co-cured under a predetermined pressure and a predetermined temperature to render the structure unitary, and the height of at least one of the side walls of one of the stiffener/spacer composite members varies along at least a portion of its length. 40. A composite structure comprising first and second composite skin layers, each of a resin-impregnated fiber material, at least two elongated stiffener/spacer composite members, each of a resin-impregnated fiber material and interposed between the skin layers, each stiffener/spacer composite member being arranged generally longitudinally of the skin layers and the stiffener/spacer composite members being spaced apart laterally, each stiffener/spacer composite member having side walls extending between and united with the skin layers by base walls bonded to the inner faces of the skin layers, and an elongated hollow mandrel of a stiffened fabric received between and in engagement with the side walls of the of the stiffener/spacer composite member, and wherein the composite skin layers and stiffener/spacer composite members are co-cured under a predetermined pressure and a predetermined temperature to render the structure unitary, and the stiffener/spacer members converge longitudinally along a least portions of their lengths. 41. A composite structure comprising first and second composite skin layers, each of a resin-impregnated fiber material, at least two elongated stiffener/spacer composite members, each of a resin-impregnated fiber material and interposed between the skin layers, each stiffener/spacer composite member being arranged generally longitudinally of the skin layers and the stiffener/spacer composite members being spaced apart laterally, each stiffener/spacer composite member having side walls extending between and united with the skin layers by base walls bonded to the inner faces of the skin layers, and an elongated hollow mandrel of a stiffened fabric received between and in engagement with the side walls of the of the stiffener/spacer composite member, and wherein the composite skin layers and stiffener/spacer composite members are co-cured under a predetermined pressure and a predetermined temperature to render the structure unitary, and at least one of the skin layers is curved along at least a portion of its longitudinal extent. 42. A composite structure comprising first and second composite skin layers, each of a resin-impregnated fiber material, at least two elongated stiffener/spacer composite members, each of a resin-impregnated fiber material and interposed between the skin layers, each stiffener/spacer composite member being arranged generally longitudinally of the skin layers and the stiffener/spacer composite members being spaced apart laterally, each stiffener/spacer composite member having side walls extending between and united with the skin layers by base walls bonded to the inner faces of the skin layers, and an elonga ted hollow mandrel of a stiffened fabric received between and in engagement with the side walls of the of the stiffener/spacer composite member, and wherein the composite skin layers and stiffener/spacer composite members are co-cured under a predetermined pressure and a predetermined temperature to render the structure unitary, and at least one of the skin layers is curved along at least a portion of its lateral extent. 43. A composite structure comprising first and second composite skin layers, each of a resin-impregnated fiber material, at least two elongated stiffener/spacer composite members, each of a resin-impregnated fiber material and interposed between the skin layers, each stiffener/spacer composite member being arranged generally longitudinally of the skin layers and the stiffener/spacer composite members being spaced apart laterally, each stiffener/spacer composite member having side walls extending between and united with the skin layers by base walls bonded to the inner faces of the skin layers, and an elongated hollow mandrel of a stiffened fabric received between and in engagement with the side walls of the of the stiffener/spacer composite member, and wherein the composite skin layers and stiffener/spacer composite members are co-cured under a predetermined pressure and a predetermined temperature to render the structure unitary, and the top and bottom skin layers meet and are in engagement at a longitudinal edge juncture and the composite structure further comprises an elongated composite member of wedge-shape in cross section and of a resin-impregnated fiber material received between and engaged with portions of the top and bottom skin layers adjacent the edge juncture.