Ski with composite structure having arcuate fibers
A ski includes an elongate core and a fiber reinforced composite layer disposed over the elongate core. The fiber reinforced composite layer has a first plurality of fibers fixed in a resin and a second plurality of fibers fixed in the resin. The first plurality of fibers extend along a first arcuate path from a left side of the ski to a right side of the ski such that the angle of the first fibers with respect to the centerline increases from the left side to the right side. The second plurality of fibers extend along a second arcuate path from the right side of the ski to the left side of the ski such that the angle of the second fibers with respect to the centerline increases from the right side to the left side. In some embodiments the first and second plurality of fibers are symmetrically positioned in the composite layer.
1. A ski defining a centerline, the ski comprising:
an elongate core;
a fiber reinforced composite layer disposed over the elongate core, the fiber reinforced composite layer comprising:
a first plurality of fibers fixed in a resin wherein the first plurality of fibers extend along a first arcuate path from a left side of the ski to a right side of the ski such that the angle of the first fibers with respect to the centerline increases from the left side to the right side; and
a second plurality of fibers fixed in the resin wherein the second plurality of fibers extend along a second arcuate path from the right side of the ski to the left side of the ski such that the angle of the second fibers with respect to the centerline increases from the right side to the left side;
wherein the first plurality of fibers are disposed symmetrically with the second plurality of fibers, and the angle of the first fibers with respect to the centerline monotonically increases along the first arcuate path;
and further wherein the first arcuate path from the left side of the ski to the right side of the ski increases from less than twenty-five degrees to more than forty degrees, and the second arcuate path from the right side of the ski to the left side of the ski increases from less than twenty-five degrees to more than forty degrees.
2. The ski of claim 1 , wherein the first plurality of fibers and the second plurality of fibers are disposed on an aft portion of the ski, and further comprising a third plurality of fibers and a forth plurality of fibers that are fixed in the resin and are disposed on a center portion of the skis.
3. The ski of claim 2 , wherein the third plurality of fibers and the fourth plurality of fibers are disposed at forty-five degrees to the center line of the ski.
4. The ski of claim 2 , further comprising a fifth plurality of fibers and a sixth plurality of fibers that are fixed in the resin and are disposed on a forward portion of the ski.
5. The ski of claim 1 , wherein the first and second plurality of fibers comprise fiberglass fibers.
6. The ski of claim 1 , further comprising a second fiber reinforced composite layer disposed under the elongate core.
7. The ski of claim 6 , wherein the second fiber reinforced composite layer comprises:
a first plurality of fibers of the second layer fixed in the resin wherein the first plurality of fibers extend along a third arcuate path from a left side of the ski to a right side of the ski such that the angle of the first fibers with respect to the centerline increases from the left side to the right side; and
a second plurality of fibers of the second layer fixed in the resin wherein the second plurality of fibers extend along a fourth arcuate path from the right side of the ski to the left side of the ski such that the angle of the second plurality of fibers with respect to the centerline increases from the right side to the left side.
8. A ski comprising:
a core defining a longitudinal axis;
a first fiber reinforced composite layer fixed to a bottom side of the core; and
a second fiber reinforced composite layer fixed to a top side of the core;
wherein the first fiber reinforced composite layer comprises (i) a first plurality of fibers fixed in a resin that are fixed by the resin along an arcuate path such that the fibers transition from an orientation on one side of the core of less than thirty degrees from the longitudinal axis to an orientation on an opposite side of the core of at least forty-five degrees from the longitudinal axis, and (ii) a second plurality of fibers fixed in a resin that are fixed by the resin along an arcuate path such that the fibers transition from an orientation on one side of the core of less than thirty degrees from the longitudinal axis to an orientation on an opposite side of the core of at least forty-five degrees from the longitudinal axis.
9. The ski of claim 8 , wherein the first plurality of fibers are disposed symmetrically with the second plurality of fibers.
10. The ski of claim 8 , wherein the first plurality of fibers cross the second plurality of fibers.
11. The ski of claim 1 , wherein the first plurality of fibers and the second plurality of fibers are disposed on an aft portion of the ski, and further comprising a third plurality of fibers and a forth plurality of fibers that are fixed in the resin and are disposed on a center portion of the skis.
12. The ski of claim 11 , wherein the third plurality of fibers and the fourth plurality of fibers are disposed at forty-five degrees to the longitudinal axis.
13. A ski defining a centerline, the ski comprising:
an elongate core;
a fiber reinforced composite layer disposed over the elongate core, the fiber reinforced composite layer comprising:
a first plurality of fibers fixed in a resin wherein the first plurality of fibers extend along a first arcuate path from a left side of the ski to a right side of the ski such that the angle of the first fibers with respect to the centerline increases from the left side to the right side; and
a second plurality of fibers fixed in the resin wherein the second plurality of fibers extend along a second arcuate path from the right side of the ski to the left side of the ski such that the angle of the second fibers with respect to the centerline increases from the right side to the left side;
further comprising a second fiber reinforced composite layer disposed under the elongate core, wherein the second fiber reinforced composite layer comprises:
a first plurality of fibers of the second layer fixed in the resin wherein the first plurality of fibers extend along a third arcuate path from a left side of the ski to a right side of the ski such that the angle of the first fibers with respect to the centerline increases from the left side to the right side; and
a second plurality of fibers of the second layer fixed in the resin wherein the second plurality of fibers extend along a fourth arcuate path from the right side of the ski to the left side of the ski such that the angle of the second plurality of fibers with respect to the centerline increases from the right side to the left side.