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How is the function of the PowerSkip ?
The PowerSkip is mainly defined by a leaf spring, which is controlled during deformation in that way, that the result is a straight movement of the fixing device. (Fig 1 and 2)
With the PowerSkip functional principle a degressive spring characteristic and a backward movement of the force point during deformation is achieved. This supports the natural force point movement in direction to heel at higher loads and allows the runner to transpose his jumping energy optimal.
For a good handling during running and jumping a low weight is essential. For this reason the PowerSkip is designed strictly to extreme light weight criterions, else only used in aerospace applications.
Because of the application of high strenght aluminium alloys for the structural parts and the use of high performance compound materials like E-glasrovings (as in rotor blades of  helicopters) for the spring, a total weight of 3.5 kg per each is achieved. For comparison: The spring force is similar to a spring in the wheel suspension of a small car. The sole weight of such a spring is about 3.5 kg.
The Model PowerSkip Pro is designed for a maximum of convenience and performance. With the new, patented kinematics it is possible to transpose the muscular strength of the lower leg into forward speed when running and into jumping height when the spring is pushed through until to the stop unit.
In Fig.3 the kinematics is shown as it happens during a run. It can be seen, that the tilting of the foot is transposed into a horizontal movement of the footlever.This allowes to run faster than with the standard modell. In Fig.4 the PowerSkip is fixed at the main structure to give an other view to the mechanics. Here it can be seen, that only negligible relativ movement between the knee and the kneebow occures. This avoids painfull bruises and allowes to run in an natural motion sequence.

Fig. 1

Fig. 2

Fig. 3

Fig. 4

How high is the durability of the PowerSkip ?
The PowerSkip is designed for professional use and can be used durable in its main parts. However, it is not possible to design every part in that way, when the weight criterion is critical. For this reason some parts must be exchanged after a certain time. The following list shows the lifetimes of this exchange parts on basis of the current experience:
Sole: MTBF 50 hours (running on hard rough surface)
The wear depends from the way of use and the roughness of the ground. On soft surfaces the liftime is nearly unlimited.
Springs: MTBF 500 hours (professional use, always bouncing to the limit stop)
The liftime of the spring depends from the number and magnitude of the load changes on the one hand and from a statistical factor of the material on the other hand. Because of this fact, there is a high uncertainty  in the MTBF number.
Note: Safety aspects are not touched, because the spring wears out slowly by losing its tension more and more. The spring never breaks into two parts and it never brakes without warning.
Bearings: MTBF 1000 hours (for E640 spring)
The life time of the bearing bushes depends from the type of the spring and from the way of use. Weaker springs than E640 elongate the lifetime considerable.

MTBF = Mean Time Between Failures
All data result from the evaluation of the current sold PowerSkip´s and can change with higher experience.