What’s in this post? We review how to set up 8mm Prusik loops for 10mm rescue rope. Context Prusik Loops are tied with 3-wraps (3-on-3) onto the rescue rope to form a progress capture or rope grab in a pulley system for rope rescue. Pulley system setup Prusik Cord The Prusik cord we choose to […]
Category: Rope Rescue
Why is a sling 2x the strength of a single strand?
What’s in this post? This post is about the theory and testing behind why making a piece of webbing into a sling is 2x the strength of a single strand. We address the specific question about tension on a single section of sling around a carabiner at the end and draw vectors to show what […]
Lightweight Jigger Testing
What’s in this post? Testing of a lighter weight jigger (4:1CD/5:1 pre-rigged pulley system) using a 5mm Prusik and a 6mm high strength cord made with a Dyneema core with a polyester sheath. We also address the weight and volume of a jigger to compare the lighter weight version with a standard version using a 6mm Prusik […]
Webbing anchors: efficient rigging and 16mm testing
What’s in this post? The basics for webbing anchors: So you know why you are using webbing anchors, what to use, set up and four ways of rigging. How to rig webbing anchors efficiently: Get the right (minimum) webbing length, rather than halfway through a rigging job finding out you are short and have to start […]
Canyon Rope Rescue Testing
Canyon Rope Rescue Testing 2021 In February 2019, a team of people from the NZ Canyoning Association got together for a weekend to discuss setting up CanyonSAR for New Zealand (as a specialist discipline under New Zealand Land SAR). As part of this weekend, we discussed and practised rope rescue in the canyoning context with […]
Back-tie rigging – tension and compression forces
Back-tie rigging – tension and compression forces The other day I had a question come through about how I worked out the tension and compression forces for a post, pole or tree when you back-tie for support. The context? Before I get to the question, we need to set the context: The front anchor is […]
Double sheet bend; but it’s fine?
Introduction I was recently undertaking testing to confirm our cave rescue setup (see the post Let’s lighten the load – update). In cave rescue, as we use the double sheet bend for rigging – being easy to adjust, especially in the middle of a rope or cord – I thought it would be a good idea to […]
Let’s lighten the load – update
Let’s lighten the load – Update. After a particularly arduous 24hrs underground and 1000m of hauling on a deep cave SAREX (Search And Rescue EXercise), we started our journey towards asking the right questions about rope rescue. Could we lighten up our backcountry rope rescue gear while keeping acceptable safety margins? For lightweight rope rescue, […]
Floating anchors: But what if the anchor blows?
Introduction Floating anchor: but what if the anchor blows? Isn’t it going to rip the other anchor out? I hear this as a common statement quoted back to me when talking about a two-point floating anchor (aka self-equalising, magic X, etc.). I can only think it’s based on the assumption you have: Built or chosen […]
Which bends for joining ropes? – Update
Introduction As part of writing the Canyoning Technical Manual, I needed to find out more about flat bends. For my own peace of mind, I had to make sure what I was putting in the book was suitable. We undertook some testing in 2015 including a control test and five flat (offset) bend variations. In 2020, […]