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A ski construction such as a ski, monoski, or snow board includes a principal base support (2) which has a sliding sole (6) that is raised to form a tip (8) at its front end. An upper surface of the ski defines a housing or pocket (20) with a central contracted region defined by lateral projections

A ski construction such as a ski, monoski, or snow board includes a principal base support (2) which has a sliding sole (6) that is raised to form a tip (8) at its front end. An upper surface of the ski defines a housing or pocket (20) with a central contracted region defined by lateral projections (18a, 18b). One of a family of elongated complementary elements (3) with hollow profiles (12a, 12b) is frictionally received in the pocket. The complementary elements can have different lengths, thicknesses, stiffness, constructions, or material properties. By selecting among the family of complementary elements, a common principal support base can be configured to have a variety of skiing characteristics which complement the skiing abilities of a variety of skiers, skiing conditions, and the like.

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1. A skiing construction with a vertical median plane of general symmetry, comprising:a principal support base on an upper surface of which is fixed at least in a foot-plate zone a complementary longitudinal element for receiving a retention binding for a boot of a user, said support base having the

1. A skiing construction with a vertical median plane of general symmetry, comprising:a principal support base on an upper surface of which is fixed at least in a foot-plate zone a complementary longitudinal element for receiving a retention binding for a boot of a user, said support base having the shape of an elongated beam with a sliding sole whose front extremity is raised to form a tip, the complementary longitudinal element having the shape of an elongated plate whose width measured between its lateral borders is smaller than a width of the support base the complementary element including a front portion connected to a rear portion by a zone of smaller width which defines a hollow profile and the complementary element being embedded in a pocket defined in the support base, the housing support base including an internal lateral projection extending laterally into the pocket to cooperate with the hollow profile of the complementary element to retain the complementary element both longitudinally and laterally. 2. The skiing construction according to claim 1 wherein a length of the complementary element ranges between 30% and 60% of a length of the support base.3. The skiing construction according to claim 1 wherein the common support base corresponds to several complementary elements a first complementary elements which is shortest in length being a plate whose lower surface cooperates with a central portion the housing while a second complementary element of intermediate length has a disengagement of the extremity in its front and rear, a third complementary element having the greatest length including a first disengagement of the extremity in its front and a second disengagement of the front extremity and a first disengagement of its rear extremity and a second rear disengagement, and in that a bottom surface of the housing is configured to cooperate with any of the complementary elements, the front extremity and the rear extremity including a stepped-up shaped zone in such manner so as to correspond to the disengagements of the extremities of the complementary element.4. The skiing construction according to claim 1 wherein a thickness of the complementary element is thicker at one of its front and rear relative to the other, an upper surface of the complementary element being inclined relative to a surface of the sole.5. The skiing construction according to claim 1 further including an intermediate element with shock-absorbing properties arranged between the complementary element and the lateral retention edge or edges.6. The skiing construction according to claim 1 wherein the complementary element is formed by two individual adjacent complementary elements.7. The skiing construction according to claim 6 wherein the two complementary individual adjacent elements are separated by a longitudinal space, which includes an intermediate element made of elastically deformable material having shock-absorbing properties.8. A skiing construction with a vertical median plane of generally symmetry, comprising:a principal support base on an upper surface of which a foot-plate zone is defined for receiving a retention binding for a boot of a user, said support base having the shape of an elongated beam with a sliding sole and a front extremity raised to form a tip; a recessed pocket defined in the support base upper surface and limited laterally by two lateral retention edges of the support base extending between a bottom surface of the pocket and the support base upper surface and whose a central zone of the pocket being narrowed by internal lateral projections of the support base protruding and extending laterally into the pocket toward the median plane of symmetry; a complementary longitudinal element having the shape of an elongated plate whose width measured between its lateral borders is smaller than a width of the support base and at least one of its lateral borders includes a hollow profile that defines a zone of smaller width, the complementary element including a front portion connected to a rear portion by the zone of smaller width, the complementary element being embedded in the pocket recessed in the support base with the internal lateral projections cooperating with the hollow profile of the complementary element. 9. The skiing construction according to claim 8 wherein the zone of lesser width of the complementary element is located adjacent a central zone of the complementary element and each of the lateral borders includes a hollow profile, a left of the lateral borders includes a left hollow profile, while a right of the lateral borders includes a right hollow profile.10. The skiing construction according to claim 9 wherein the hollow profiles have a rounded profile, while the corresponding internal lateral projections have a complementary round shape, so that each of the projections represents a retention projection assuring lateral and longitudinal retention of the complementary element relative to the support base.11. The skiing construction according to claim 8 wherein the complementary element is formed by two individual and independent adjacent complementary elements each of the individual elements having its own hollow profile on its external lateral border, the complementary elements both being received in the pocket of the support base with the internal lateral projections engaging the hollow profiles of both complementary elements.12. The skiing construction according to claim 11 further including a shock-absorbing element of elastically deformable material received in the pocket.13. The skiing construction according to claim 12 wherein the shock-absorbing element is disposed between the two individual complementary elements.14. A skiing construction comprising:a principal support base on an upper surface of which a complementary element receiving pocket is defined at least in a foot-plate zone for receiving a retention binding for a boot of a user, said support base having the shape of an elongated beam with a sliding sole whose front extremity is raised to form a tip, the support base including an internal lateral projection which extends laterally into a central portion of the pocket to define a lateral retention edge; a set of several different complementary elements corresponding to the support base, each complementary longitudinal element having the shape of an elongated plate whose width measured between its lateral borders is smaller than a width of the support base and dimensioned for receipt in the pocket, each complementary element including a front portion connected to a rear portion by a hollow profile of smaller width which engages and is retained by the lateral retention edge when each complementary element is removably disposed in the pocket. 15. The skiing construction according to claim 14 wherein the several complementary elements are of different lengths.16. The skiing construction according to claim 14 wherein the several complementary elements are of different thickness.17. The skiing construction according to claim 14 wherein the several complementary elements have different mechanical characteristics to confer to the support base different performance characteristics.18. The skiing construction according to claim 14 wherein the several complementary elements have different lengths and different shapes at their front and rear extremities.19. A skiing construction with a vertical median plane of generally symmetry, comprising:a principal support base on an upper surface of which is fixed at least in a foot-plate zone a complementary longitudinal element for receiving a retention binding for a boot of a user, said support base having the shape of an elongated beam with a sliding sole whose front extremity is raised to form a tip, the complementary longitudinal element having the shape of an elongated plate whose width measured between its lateral borders is smaller than a width of the support base and at least one of its lateral borders includes a hollow profile, the complementary element including a front portion connected to a rear portion by a zone of smaller width and the complementary element being embedded in a housing defined in the support base, the housing including at least one lateral retention edge with an internal lateral projection which cooperates with the hollow profile of the complementary element, the common support base corresponds to several complementary elements of which at least one includes at least one extremity disengagement in a front or in a rear and in that a bottom surface of the housing is configured to cooperate with any one of the complementary elements, whose front extremity or rear extremity includes at least one stepped-up zone, in such fashion so as to correspond to the disengagement of the extremity or the extremities of the complementary element. 20. A ski construction with adjustable physical properties, the ski construction comprising:a principal ski base having a lower sliding surface and an opposite upper face which is adapted to receive a binding; an elongated pocket defined centrally in the upper face, the pocket being laterally narrowed by a laterally projecting portion of the ski base which defines a lateral retention edge; a plurality of longitudinal elements which are configured to be individually received and mounted in the pocket, each of the longitudinal elements having a narrowed region that defines a hollow profile for engaging the lateral retention edge, the longitudinal elements differing in at least one of: (a) length; (b) stiffness; (c) thickness; (d) construction; (e) material properties; such that changing a one of the longitudinal elements that is received in the pocket changes skiing characteristics of the principal ski base.