The 10mm cord selected for the treeMOTION was adopted because of the combination of the Dyneema® core and tightly braided and relatively thick polyester cover. A mid-layer seeks to ensure core and cover work well together. Polyester was chosen as the cover material because of its’ good abrasion resistance, good wet strength, excellent UV resistance, high conversion strength when stitched, etc. A high-strength Dyneema® core continues to provide considerable strength even when the polyester cover has worn somewhat. The standard construction was optimized for use as a rope bridge.
The stitched ends have more than one use
The rope bridge approved by TEUFELBERGER for use on the treeMOTION harness is supplied with red stitching approximately 35mm long and close to each end. This stitching has a number of purposes:
- It ensures the tail of the approved stopper knot is sufficiently long;
- In the event that the knot becomes overloaded, the tail may be pulled into the knot. The stiffness of the stitching offers resistance and helps to maintain the safe length of tail and therefore the integrity of the knot itself; and
- In the event that the cover of the bridge becomes compromised and fails, there is a tendency for the core to pull through the entire knot. The stitching holds the core and cover together at the end of the bridge. This helps to ensure a high configured strength despite the failure of the cover.
Only rope bridge approved for the treeMOTION harness
No other cordage is approved for use as a rope bridge on the treeMOTION harness. Considerable testing has been carried out on the treeMOTION rope bridge in TEUFELBERGER’s own test facilities (dynamic and static testing), the test facilities of an independent notified body, extended validation tests prior to the start of production, and ongoing assessment of performance in real life service conditions with our long term validation partners. During the years of treeMOTION production, the performance of the approved rope bridge has shown that the material is both suitable and sufficient to be used in the specified manner.
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