Haul Systems
Below is a series of links to all the publically available research on haul and tensioning systems we have found to date (we exclude papers with analyses and other citations because there are so many!). We have made an attempt to find as much as we could, but it is a work in progress. If you know of any additional testing we are missing, please bring it to our attention (contact us)!
Haul Systems
Published Research:
Unpublished Research:
Videos of Haul System Testing:
Tensioning Systems
Unpublished Research:
Videos of Tensioning System Testing:
Miscellaneous
Edge Friction:
Hand Grip Strengths:
Theory Papers:
Haul Systems
Published Research:
- Churchman, Gregory, 2009, In Quest of the Holy Grail, Proceedings of the International Technical Rescue Symposium 2009
- Decker, Bill, Wefer, Fred, 1970, The Pit Rigger, Speleo Digest 1970:246-250
- Evans, Thomas, 2015, Response of Some 3:1 Haul Systems to Excessive Loading, Proceedings of the International Technical Rescue Symposium 2015 (Also posted on the ITRS archive page)
- Frank, J.A., 2014. CMC Rope Rescue Manual, Revised Fourth Edition, CMC Rescue Inc., Santa Barbara, California (Appendix G, p. 333-334) (Effects of Bends on Rope Strength)
- Manning, Timothy, 2000, Rescue System Mechanics, Interim Report, Proceedings of the International Technical Rescue Symposium 2000 (also hosted on the Mountain Rescue Association Grant Archive here, and here)
- McKently, John, 2011, Revisiting Pulley efficiency in Rescue Rigging, Proceedings of the International Technical Rescue Symposium 2011
- Schermerhorn, J.H., Taylor, D.S., 1967, A vertical Rescue Technique, NSS News 25(12):217-218
- Smith, Cedric, 2015, Multi-Variable Prusik Hitch Performance Testing, Proceedings of the International Technical Rescue Symposium 2015
- Smith, Gordon, 2014, Pulley Efficiency in a Rescue System, Proceedings of the International Technical Rescue Symposium 2014
- Walker, DJ, McCullar, Russell, 2014, Slow Pull Testing of Progress Capture Devices, Proceedings of the International Technical Rescue Symposium 2014 (Reprinted in: Walker, DJ, McCullar, Russell, 2014, Slow Pull Testing of Progress Capture Devices, Nylon Highway 59: 16 pages) (MPD, Petzl I'D)
Unpublished Research:
- Balance Community, 2013, An In-Depth Look at Pulley Efficiency
- Floyd, Dug, Horrocks, Glenn, Unknown Date, How Efficient are Pulleys and Related Devices Used by BWRS in Vertical Rescue
- jktinst, 2014, Self Rescue Hauling
- Pete Knight, 2016, More force testing on 5:1 Systems
- Pete Knight, 2015, Loads on a 5:1 Tensioning System
- Prattley, Grant, 2016, Pulley versus carabiner efficiency.
- Richard Delaney, 2015, Members: Ideal, theoretical, & actual MA (Requires a subscription to Ropelab to access)
- Richard Delaney, 2015, Members: Pulley efficiency (Requires a subscription to Ropelab to access)
- Richard Delaney, Unknown Date, Members: Hauling friction, Friction through Progress Capture Devices (PCDs). (Requires a subscription to Ropelab to access)
- Sheehan, Alan, 2004, Friction Testing and Pulley Systems in Vertical Rescue
- Sheehan, Alan, Howard, Peter, Young, Jim, 2004, Vertical Rescue Friction Testing
- Stovall, Paul, Unknown Date, The Voodoo tensioning system (One page showing forces in the system graphically)
- Titt, Jim, 2014, Self Rescue Hauling
- Vickers, Pete, 2006, Manual Line Loading Investigation (How much force a single person can apply to simple haul systems)
- Unknown Author, 2009, Random Rope and System Testing
- Unknown Author, 2013, Heave-Ho! (Pictures and Video of testing)
Videos of Haul System Testing:
- Eric Campbell, 2009, AZTEK pull test
- Eric Campbell, 2009, AZTEK pull test (travel restrict side) (pull test of a Purcell prusik)
- SARRR, 2015, Slow Pull Testing 3 to 1 Haul Systems on 11mm PMI Classic Sport Max (Pit Rope)
- SARRR, 2015, Slow Pull Testing 3 to 1 Haul Systems on 11.5mm PMI Isostatic Rope
- SARRR, 2015, Slow Pull Testing 3 to 1 Haul Systems Locked Off on 11mm PMI EZ Bend Rope
Tensioning Systems
Unpublished Research:
- Balance Community, 2012, CT Sparrow Review (Constructed a slackline with the Sparrow and measured the peak load and how hard it was to release the tension)
- Balance Community, 2012, Edelrid Eddy as a Slackline Pulley System Brake (Constructed a slackline with the Eddy, and measured the peak load and ease of lowering the tension)
- Balance Community, 2012, Multiplier Pulley Comparison (Comparison of forces generated using different slackline tensioning systems)
- Balance Community, 2012, Petzl GRIGRI 2 vs. RIG vs. I'D as a Slackline Pulley System Brake (Comparison between different descent control devices as a slackline pulley system and release mechanism)
- Balance Community, 2012, SMC 3-inch Doubles VS Rock Exotica Mini Machined Doubles - The showdown! (Comparison of forces in a slackline developed using two different pulley types)
- Balance Community, 2012, The CMC MPD - Pure Brake Awesomeness (use comparison between the MPD and the I'D as a slackline tensioning and release tool)
- Evans, Thomas, 2015, Strength and Failure Mode of the Voodoo Tensioning System
- Evans, Thomas, 2016, A Comparison of the Trucker's Hitch, 3:1 Block and Tackle, Voodoo, and Poldo Tensioning Systems
Videos of Tensioning System Testing:
- Adam Burtle, 2010, Primitive and multiplier slackline tension tests
- Balance Community, 2012, Slack Science - CT Sparrow Review (Video showing how they measured the peak load and how hard it was to release when used to tension and release a slackline)
- Balance Community, 2012, Edelrid Eddy as a Slackline Pulley System Brake (Video showing the tests of building a slackline with an Eddy and measuring the maximum force created and ease of releasing tension)
- Balance Community, 2012, Multiplier Pulley Comparison (Video shows the testing used to determine the relative efficiencies of different pulleys)
- Balance Community, 2012, GFIGRI 2 vs. RIG vs. I'D as a Pulley System Brake (Video shows the testing of the various devices as a slackline tensioning system component and ease of releasing tension)
- Balance Community, 2012, SMC 3" Double Pulleys vs. Rock Exotica Mini Machined Doubles as Slackline Tensioning System (Video shows the testing comparing the two pulley types as slackline tensioning systems)
- Balance Community, 2012, CMC MPD vs Petzl I'D as a Slackline Pulley System Brake (video shows a comparison between the MPD and I'D as both haul system components and as tension release devices)
- MrSlackline, 2012, Slackline Brothers Break Testing!! (Video showing slow pull testing of a haul system, and pulleys)
- MrSlackline, 2012, Brake testing SBI's with a tractor... (Video showing a tractor pulling on a pulley system designed to tension a slackline)
- Richard Mumford, 2014, Double Rope Traverse Testing and Trials
- slackProXde, 2014, tensioning a longline (here 150m) with the lineGrip and line Tight (re-upload June 2nd 2014)
- SLACKTIVITY Slacklines, 2014, The HangOver Pulley-System (Video shows different configurations of haul systems to tension a slackline)
Miscellaneous
Edge Friction:
- Richard Delaney, 2014, Members: Managing edge friction (Requires a membership to Ropelab to access)
- Richard Delaney, 2014, Members: Rope protection and falls (Requires a membership to Ropelab to access)
Hand Grip Strengths:
- Frank, J.A., 1998. CMC Rope Rescue Manual, Third Edition, CMC Rescue Inc., Santa Barbara, California (Appenix E, p. 191-193)
- Gibbs, Mike, 2005, Mechanical Hand(s): Sample Data from Drop Testing, Proceedings of the International Technical Rescue Symposium 2005
- Heilman, Unknown Date, Member Pulling Force-Heilman.xls
- O-Connell, Dennis, 2012, Mechanical Advantage Systems: How Strong?
- Ratagonia, 2013, Test Lab: How Hard Can You Pull? (Also posted here)
- Unknown Author, 2013, Heave-Ho! (Pictures and Video of testing)
- Vickers, Pete, 2006, Manual Line Loading Investigation (How much force a single person can apply to simple haul systems)
Theory Papers:
- Attaway, Stephen, 1999, The Mechanics of Friction in Rope Rescue, Proceedings of the International Technical Rescue Symposium 1999
- Fox, Tim, Holton, Mick, Unknown Date, How to Calculate the Mechanical Advantage of Hauling Systems
- Hansen, Doug, 2001, Pulley System Forces - Angles of Pull, Proceedings of the International Technical Rescue Symposium 2001
- Rigging for Rescue, Unknown Date, The T-Method for Pulley Systems
- Schwartz, Ralphie, Unknown Date, Understanding Mechanical Advantage in the Single Sheave Pulley Systems Used in Rescue Operations
- Schwartz, Ralphie, Unknown Date, Calculating Forces in the Pulley Mechanical Advantage Systems Used in Rescue Work
- Shokoples, Cyril, 1994, Pulleys & the 3:1 Pulley System
- Smith, Bruce, 1976, Lifting with Pulleys, Nylon Highway 5:2-5
- Thorne, Reed, 1999, A Young Person's Guide to Pulley Systems, Proceedings of the International Technical Rescue Symposium 1999
- Titt, Jim, Unknown Date, Belay Device Theory, Testing and Practice