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Composite materials
By definition, they are made up of reinforcements, bound together with a resin. The first appearance in their current aspect can be traced back in the second half of the 20th century.
They gradually replaced aluminum, which had already previously replaced wood in high performance applications.
Many products have followed this very same evolution from wood to Aluminum to composites: tennis rackets, boats, aeronautical engines, and… bows.
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The C monolith
Uukha bows are made of epoxy impregnated carbon reinforcements, molded at high pressure and high temperature.
The result is a monolithic composition whose mechanical properties are far higher than those of traditional laminates.
This technique has the advantage of being completely insensitive to weather variations.
We assemble aramide, glass and carbon fibers together, in order to optimize stability and to remove vibrations.
Our Ux100 limbs are 90% carbon/epoxy. This percentage reaches still 25% for our Ex1 range.
Our products are developed following processes used by the aeronautic industry.
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Draw curve
We have compared the Ux100 limbs with two other reference limbs (same riser). Curves of both reference bows, in green and blue on the graph, are very close.
The Ux100bow curve, in red on the graph, is clearly different. NB: these curves represent accurate data.
The curve slope is weaker at 29”. Ux100 limbs are thus smoother.
The curve “bump” is more pronounced. After the release, the thrust remains higher. The thrust of the arrow also falls less quickly than when using other limbs. The thrust is consequently more continuous.
Archer Benefit:
- Smoothness = minor tiredness, a greater easiness at the end of the traction
- The "bump" of the curve = a more regular thrust for a much more precise arrow exit.
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Torque stiffness
Taking 100 as a reference base for the torque stiffness of first class limbs, Ux100 bows have instead a 180 stiffness:
This additional 80% confers an exceptional lateral stability to released arrows.
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Vibrations
We have measured the value in g (1g=9,81m/s²) of the shock transmitted to the arm after the arrow release.
It is equivalent to the initial amplitude of the vibration:
A lower value shows that the bow is more comfortable and optimizes the protection of your articulations.
Vibrations are dampened very quickly, and limbs look like stopping right after arrows has left the string.
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Validations
These results have been confirmed by comparative tests carried out by an independent laboratory (CRITT Sports loisirs)
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Our specialist’s opinion :
During the traction movement, we feel the great smoothness.
When the arrow is released, we are then impressed both by the fluidity of the arrow exit and its speed. Very little vibrations can then be felt in the bow.
The arrow lateral dispersion is also reduced by the impressive limbs’ stiffness.
A synthesis of performance and comfort that makes shooting sessions particularly pleasant and efficient.
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Synthesis of the Uukha technology contributions
The table below provides a global overview of various limbs performances among the Uukha range. Highest reference performances are recalled in the right column.
|
Limbs |
Ux100 |
HX10 |
EX1 |
Up market reference 2010 |
|
Technology |
Monolith C90 |
Monolith C50 |
Monolith C25 |
Laminated |
|
Carbon rate |
>90% |
50% |
25% |
15%? |
|
Smoothness |
++++ |
++++ |
++++ |
+++ |
|
Stability |
+++++ |
++++ |
+++ |
+++ |
|
Vibrations |
++++ |
+++ |
+++ |
+++ |
|
Speed |
++++ |
+++ |
++ |
++++ |
|
Size |
SML (24-50#) |
SML (24-44#) |
SML (22-40#) |
SML (22-50#) |
