Slow Pull Testing 3 to 1 Haul Systems Locked Off on 11mm PMI EZ Bend Rope

We broke sixteen 3:1 haul systems built with 11mm PMI EZ Bend rope with 8mm PMI accessory cord prusik to:
1. Identify the weakest link
2. Identify the failure mode
3. Quantify the failure strength
Results:
1. The weakest point was one of three things: 12/16 tests the prusiks failed, 3/16 tests the rope mantle failed, 1/16 tests the prusik slipped continuously to failure.
2. The average failure strength was 15.2 kN (3408 lbs), with a standard deviation of 2.6 kN (589 lbs), and range of 10.8 kN (2427 lbs).
3. The results were consistent for all the haul systems built with the same components, however the haul systems that were built with other rope and accessory cord combinations provided different results.
The results will be presented at the International Technical Rescue Symposium (ITRS) 2015. When the paper is finished it will be posted on the ITRS web page at:
www.itrs-online...
Or visit the SARRR research archive web page at:
sarrr.weebly.com/