Cmc knot efficiency chart Outstanding hand protection meets dexterity in our Rappel Gloves. All CMC Lifeline is sold by the foot. ” During the process of revising the CMC Rope Rescue Manual in 2008 we thought it would be interesting to revisit the tests, and if possible repeat them to see how the results compared. It is rather strange that there are many activities that still use knots, yet there is so little information out there about the actual strength of a knot. The fishing knot strength chart […] A CMC Rescue blog post about search and rescue teams and the diameter size rope they prefer with back country, technical rescue systems for raising and lowering loads in patient evacuations. Knowing which knots to tie can be a game-changer. Nonetheless it is important to be aware of 4-TO-1 RULE: 1. Overhand Knot Water Knot Overhand Loop Round Turn & Two Half Hitches Hand Cuff Knot Clove Hitch Prusik Hitch Double Fisherman's Bend Poacher's Knot Figure 8 Figure 8 on a A mechanical rope grab, or a friction knot tied with a prusik loop can be used as a ratchet. If you have any questions about knots, equipment, or education, please email the CMC Instructors at askaninstructor@cmcpro. Both have their merits and limitations, but how do they stack up against each other in the context of mechanical advantage systems In this video, CMC Rescue provides step-by-step instructions on how to tie the most popular Rope Rescue knots. CMC demonstrates how to tie a Poacher's Knot. In this video, CMC shows how to tie a High Strength Tie-Off. Please feel free to select and watch the knots videos of your choice by playing the videos below. These are knots that will be used during our classes. The video also provides slow-motion visuals to help you learn it faster! Welcome to CMC Fundamentals: Learn Your Knots. This is the same knot as the Figure 8 on a Bight, but tied around an object to set up an anchor. Comes in an industrial-grade ballistic nylon carrying bag with locking buckle. Printed in USA. CMC Capto vs. The spiral-bound guide measures 10 cm (4”) W x 15. Jan 20, 2018 · Strength of Knot Information Since posting the above chart, I have been searching the Internet for more information about the strength of knots. Each knot and hitch is a carefully chosen tool, tailored to the specific demands of the rescue scenario. Example: To prevent efficiency loss with 1⁄2 inch rope, the knot must have no bends smaller than 2-inches. The question is, has been, and will always be, how much? The general rule has been a knot reduces strength approximately 50%. In this video, CMC shows how to tie an Alpine Butterfly Knot. Comprehensive comparison of the breaking strength efficiency of the best and strongest fishing knots for braided line. See detailed instructions, pictures, tutorials, and videos for the Palomar Knot. In a number of professions, human life hangs on a knotted rope. In this video, CMC Rescue provides step-by-step instructions on how to tie the most popular Rope Acces knots and bends. In the first part of the paper, the The elongation of a life safety rope relates directly to the impact forces encountered when the rope stops a fall, as well as to the efficiency of a lowering/raising system. In most drop and pull tests, a rope will break at a knot. None of these figures take out the loss for a sharp bend where the webbing wraps into the carabiner, but Compound Loop Strength Just how strong is the Compound Loop? Here are the knot strength efficiency numbers for the Compound Loop as tested on monofilament, fluorocarbon, and braided fishing lines. Their exploration into knot efficiency involved 487 tests across a number of rope types, revealing insights into how diameter, construction, and materials impact knot efficiency. Knot efficiency – 64%. In the first part of the paper, the In this video, CMC shows how to tie a Water Knot. The purpose of testing was as preparation for the First Edition of the CMC Rope Rescue Manual and for presentations at various industry events. Jul 2, 2021 · 4-TO-1 RULE: 1. It may be configured as a 4:1 or 5:1 mechanical advantage system. S. Secure a second locking carabiner and pulley on the load line. It is likely anyone who has ever used ropes has learned to tie knots – to create eyes, connect rope to objects or even just for decoration. In this video, CMC shows how to tie a Portuguese Bowline (aka: Bowline on a Coil). 2 cm (6”) H and fits into radio harnesses, BDU and uniform pockets, so you can take it anywhere! 132 pages. The Revised 5th Edition includes the Learn by Doing with the CMC School Long recognized as a leader in the rescue and work-at-height equipment industries, we applied our expertise and resources to the development of a curriculum for teaching technical rescue and rope access skills. Our recent testing of this knot showed a much lower efficiency than earlier tests. Apr 26, 2023 · Fishing knot strength varies by type and usage. Download PDF forms using the links below. Comprehensive comparison of the breaking strength efficiency of the best and strongest fishing knots for monofilament line. , we have the capability to fill Extremely low stretch kernmantle 100% high tenacity polyester rope classified to NFPA standards for high lines, long rappels, hauling, & mechanical advantage systems. Jul 16, 2024 · The Twin Tension System is more than just a knot-passing technique—it’s a philosophy of efficiency, adaptability, and safety. CMC Equipment, committed to providing pulleys for use with rope rigging equipment, pulley systems, swivels, carabiners, and training gear for search & rescue organizations and departments. Revised 5th Edition. Knot strength depends on material, The Fish-N-Fool Knot is a knot invented by an Idahoan angler that sits atop the knot strength chart. In theory this would give all 16,000 lbf available to the anchor. 03/21/2024 CMC Fundamentals: Learn Your Knots - Figure 8 Bend 03/21/2024 CMC Fundamentals: Learn Your Knots - Poacher's Knot 03/21/2024 CMC Fundamentals: Learn Your Knots - Figure 8 Knot 03/21/2024 Comprehensive comparison of the breaking strength efficiency of the best and strongest fishing knots for monofilament, fluorocarbon, and braided lines. CMC provides PDF versions of each of the forms found in our Rope Rescue Manual, Confined Space Entry & Rescue Manual and Trench Rescue Technician Manual. It works well for anchor systems having two, three, or more points and the self-equalizing and omni-directional efficiency of the knot is increased when it is tied in rope rather then web. See efficiency test results. Available free from the App Store and Google Play. After tying a knot, it is important to consider the length of the tail (s) exiting the knot. used CMC Lifeline, a 100% nylon product, which is similar in construction to the Wellington Puritan<br /> Rhino except that it is manufactured by New England Rope. A double layer at the thumb web protects hands when rappelling, and the wear-resistant double . Read More CMC Static-Pro Rope, 1/2" An extremely low-stretch kernmantle rescue lifeline constructed of 100% High Tenacity Polyester (HTP) fiber. This is the basic knot for the Figure 8 family and also a good stopper knot for the end of a rope. The companion Field Guide to the CMC Rope Rescue Manual features water- and tear-proof stock for lasting durability. com or visit the CMC School page for class schedules. Relative knot strength, also called knot efficiency, is the breaking strength of a knotted rope in proportion to the breaking strength of the rope without the knot. CMC’s highest level of dexterity means you can wear these gloves to tie knots and work with hardware, set up a system or rappel. Fishing requires knowledge, experience, and skill. Our hands-on method, taught by the industries’ most seasoned professionals, is what sets the CMC School apart from other training programs. Abstract All knots reduce the breaking strength of rope. Apr 9, 2022 · Did you know that: Over 75% of fly anglers experience frustration when it comes to knots failing Almost 70% of fly anglers use either the clinch or improved clinch knot, tippet to fly The #1 knot in our fly fishing index below showed a —very significant —66% increase in break strength over the clinch knot, when using fluorocarbon tippet material. Prusik Knots for 3:1 systems. The main objective of the presented research is to provide an in-depth revision of commonly used loop knot efficiencies employing modern experimental technologies and correct statistical processing. Their investigation into knot effectiveness encompassed 487 trials across various rope varieties, uncovering valuable insights Nov 13, 2024 · A lower-efficiency knot may weaken the rope further, requiring careful consideration in system safety calculations. Rescue Equipment Rescue School CMC manufactures and distributes Rescue Equipment. Any knot tied in a rope creates a weak point. McNally Loop Strength Just how strong is the McNally Loop? Here are the knot strength efficiency numbers for the McNally Loop as tested on monofilament, fluorocarbon, and braided fishing lines. Mar 23, 2011 · Since a wrap three, pull two tied correctly has the water knot in the non-loaded wrap, it takes the 75% efficiency out of the mix and the 2 loaded wraps are each at 100%. This CMC Rope Rescue Field Guide 5th Edition can be carried in uniform pockets, radio harnesses, and more for easy travelability. , moisture, temperature) can affect performance. In this video, each step is clearly shown in sequence to allow rope technicians to quickly add this technique to their skill set. Each step is clearly demonstrated in sequence to allow rope technicians to quickly and 03/21/2024 CMC Fundamentals: Learn Your Knots - Overhand Knot 03/21/2024 CMC Fundamentals: Learn Your Knots - Scaffold Knot 03/21/2024 ITRS 2023 Presentation: Down the Rabbit Holes of Small Diameter Rope Systems 03/19/2024 The CMC brand is synonymous with technical rescue and rope access expertise around the world. Dressed knots are stronger and much easier to inspect. 2 cm (6”) H and fits into radio harnesses, BDU and uniform pockets, so you can take it with you anywhere! Secure a figure-eight-on-a-bight knot or other appropriate knot suited for the load into one end of the haul line and secure it to the anchor. , and is the largest producer of rebar in the nation. Knot efficiency – 100% (if the diameter of the anchor is at least 4 in (10 cm)). The polyester fibers do not absorb water, so there is no loss of strength or increase in weight if the rope gets wet. Among the most debated tools in rope rescue are the CMC Capto and the Prusik Knot. Learn their efficiency, versatility, and reliability in rescue operations. Secure an anchor sling, locking carabiner, and a pulley to the anchor. It is also the knot climbers use to tie into their harness. Integrity. CMC demonstrates how to tie a Clove Hitch. May 28, 2019 · “The following strength of knot table show the efficiency or relative strength normally to be expected of twelve common knots when tied in manilla rope up to 1″ in diameter. The Figure 8 Bend is used to tie two ropes together. This presentation, as you can tell from the title, is a follow up to our earlier presentations in 2008 and 2014 at ITRS about knot efficiency for various sizes of kernmantle rescue rope. Our innovative tools, education and training are used by Know the minimum breaking strength for one-inch webbing anchors - some common configurations. CMC Field Guide App™ The CMC Field Guide App has received a new look and improved features! Enjoy newly added videos and product manuals, enhanced note-taking features, improved menu navigation, and a new download feature that allows you to download only what you need. Study with Quizlet and memorize flashcards containing terms like What is knot strength?, What is knot efficiency?, What is efficiency of a bowline? and more. They ensure stability, distribute weight, and provide the reliability needed in life-threatening situations. This also means that the strength of knots is a heated topic, one that can cause stern conversations between professional and volunteer riggers alike. CMC demonstrates how to tie a Portuguese Bowline (aka Bowline on a Coil). Welcome to CMC Fundamentals: Learn Your Knots. Each step is clearly demonstrated in sequence to allow rope CMC Rescue walks you step by step through the process of tying a figure 8 knot on a bight. A variable-friction descent control device for rescue systems and rappels Incorporates a high-efficiency pulley with an integral rope-locking mechanism (ratchet) for a haul system The built-in becket allows cleaner rigging and more efficient pulley systems The MPD allows main line and belay line rigging to be mirror images of one another One Learn knots by watching videos presented by one of our CMC Instructors. Strong knots, like the Palomar, FG, and Bimini Twist, often score 95/100. Sometimes called an Overhand Bend or ring bend, the Water Knot connects two ends of webbing together. Let’s explore in more depth below ! Our complete list of Manuals and Field Guides published by CMC for trench rescue technician, rope rescue and confined space entry and rescue. But at CMC, we CMC Steel operates nine state-of-the-art EAF mini and micro mills across the U. CMC Kootenay Ultra Pulley The Kootenay Ultra Pulley is the most functional, versatile knot-passing and high-strength tie-off pulley available. 45 USD. Both have their merits and limitations, but how do they stack up against each other Kootenay anodized aluminum pulley for knot passing & tie-off of tag lines and hoist rope in rigging high lines. In early 2004 I asked and received permission from the Cordage Institute Technical Committee to conduct a study on knot efficiency. Mechanical Devices The Prusik Knot and mechanical devices like the CMC Capto and Petzl Rescucender each have distinct advantages in rope systems: While mechanical devices offer efficiency and ease of use, the Prusik’s simplicity, lightweight nature, and cost-effectiveness make it indispensable in many scenarios. Each step is clearly demonstrated in sequence to allow rope technicians to quickly and easily add this knot to their skill set. The industry standard for those who prefer traditional nylon ropes, CMC Lifeline is a great choice whether you are Dec 3, 2024 · CMC Capto vs. By using recycled metal in our EAF mills, we’re able to create products our customers need, while consuming fewer natural resources and at a lower rate of CO 2 emissions. Comprehensive comparison of the breaking strength efficiency of the best and strongest fishing knots for fluorocarbon line. This presentation, as you can tell from the title, is a follow up to our earlier presentations in 2008 and 2014 at ITRS about knot efficiency for various sizes of kernmantle rescue rope. With less than 2% stretch at 300 lbf, Static-Pro is an excellent choice for high lines, long rappels, and many mechanical advantage KERNMANTLE ROPE SHEATH CONSTRUCTION Variations in sheath construction provide differences in abrasion and cut resistance, rope performance, and load carried by the sheath. For high lines, the rigging holes allow for optimum separation of tag lines and hoist ropes for reeving variations. Sharing a pride in a quality pulley, in value and workmanship, but above all, in service to both career and volunteer rope rescue professionals. The “tightness of the bends” determines the efficiency ratings of knots. 03/21/2024 CMC Fundamentals: Learn Your Knots - Figure 8 Bend 03/21/2024 CMC Fundamentals: Learn Your Knots - Poacher's Knot 03/21/2024 CMC Fundamentals: Learn Your Knots - Figure 8 Knot 03/21/2024 The effect of pulley efficiency on a mechanical advantage system is cumulative, meaning it increases with the number of pulleys (or sheaves) in the system. ) The live Department Of Government Efficiency (dogegov. It is a self-locking knot and the large bends make it easier to untie after the rope has been loaded than other knots. The CLUTCH enables efficient hauling via the integrated rotating sheave and immediate lowering without system modification. Mar 7, 2025 · Knot “efficiency”, or the strength of a rope with a knot, often comes up here and most discussions seem to end up pointing to publications like the CMC Field Mar 7, 2025 · Knot “efficiency”, or the strength of a rope with a knot, often comes up here and most discussions seem to end up pointing to publications like the CMC Field Oct 31, 2024 · Learn how knot choice impacts force multiplication in rope rescue, enhancing safety and efficiency for fire service and SAR teams. In this video, CMC shows how to tie a Figure 8 Bend. Offers rope rescue techniques. While a single change-of-direction pulley would reduce the output force by 5%, with four pulleys (or sheaves) in the system, the reduction of the output force approaches 20%. There’s a knot for every application and for many applications there is no better solution than a knot. Although not possible when tying most knots, this rule must be followed as much as possible (ropes over square edges, ropes through pulleys, etc. 4-to-1 rule refers to the efficiency of rope during bending. Triple Loop Knot Strength Just how strong is the Triple Loop Knot? Here are the knot strength efficiency numbers for the Triple Loop Knot as tested on monofilament, fluorocarbon, and braided fishing lines. Feb 9, 2024 · February 9, 2024 Rescue Knot Efficiencies Prompted by increasing inquiries regarding the durability and attributes of 11 mm NFPA General Use Rope, our friends at CMC (Instructors LeRoy Harbach and John McKently) embarked on a sequence of experiments within the CMC lab. Look beneath the surface and you’ll see all that CMC offers — Strength. Here are the top-performing knots and how to tie them. Dependability. Purchase any of our rescue manuals. These revolutionary features, plus ball bearings within the sheaves that maximize efficiency for raising and lowering loads of up to 681 lbs, makes Wingman a simple tool you will always want at your side. Introduction Nearly all rope systems use a knot or knots in their construction, so understanding the strength and behavior of knots in a variety of materials is important for understanding system tolerances. com) price today is $0. CMC demonstrates how to tie a an Alpine Butterfly Knot. Choosing the right knot can make the difference between catching that big fish or losing it. They also Jan 15, 2024 · The Importance of Knots and Hitches Knots and hitches are the connectors that bind lifelines to anchors, rescuers, and victims. Pittard’s Armor-Tan leather and unique para-aramid fiber stitching combine for exceptional durability. In this video, CMC shows how to tie a Figure 8 Knot. Dec 3, 2024 · Prusik Knots vs. In 1987 personnel from CMC Rescue performed tests on a variety of knots commonly used in rescue systems to determine their efficiency. That’s not just a description of our products, but also our people. Note: Most rescue knots have a 20-to-28% efficiency loss. Both have their merits and limitations, but how do they stack up against each other […] Evaluating Rescue Knot Efficiency in 11 mm General Use Ropes: https://hubs. If a rope is bent around an object at least four (4) times its diameter, there will be no loss of efficiency due to bending. Jun 27, 2025 · Learn what you can expect from ropes which have been spliced, knotted or hitched when it comes to rope efficiencies and Nov 13, 2024 · This guide covers foundational concepts, essential testing insights, and practical recommendations for applying knot efficiency data effectively in the field. The important question is how much elongation is right for any particular application. In this video, each step is clearly shown in sequence to allow rope technicians to quickly add this knot to their skill set. 004135 USD with a 24-hour trading volume of $1,848,188. Sure, you’ll find CMC construction solutions at the heart of much of our modern infrastructure — from AT&T Stadium in Dallas to the Pentagon to essential highways, bridges and buildings all over the world. In this video, CMC shows how to tie a Figure 8 on a Bight. By building systems using different combinations of mechanical advantage pulleys, change of direction pulleys, rope, anchors and ratchets, we can come up with the right tool for the specific job we need to accomplish. Like many of the strongest knots, it employs a double line tying technique, which allows it to achieve a high The elongation of a life safety rope relates directly to the impact forces encountered when the rope stops a fall, as well as to the efficiency of a lowering/raising system. Each step is clearly demonstrated in sequence to allow rope technicians to quickly and Knot “efficiency”, or the strength of a rope with a knot, often comes up here and most discussions seem to end up pointing to publications like the CMC Field Guide. However, when pressed to provide data Revised 5th Edition CMC Rescue, Inc. Dec 3, 2024 · Compare Mechanical Ascenders vs. That is almost true. Practical Application: While lab tests on knot efficiency offer standardized data, real-world factors such as rope diameter, material, and environmental conditions (e. CMC Rescue School offers rescue school courses and rescue classes. It has great knot strength efficiency across all line types, and bested nearly every other knot in a series of head to head competitions for measuring knot strength and efficiency. g. However, until now only a poor attention of scientists has been paid to the properties of knots. la/Q02h40TH0 Motivated by mounting questions about the strength and characteristics of 11 mm NFPA General Use Rope, CMC May 12, 2025 · Learn how to perform a twin tension knot pass in lowering systems using a figure 8 loop and devices like the Clutch or MPD for smooth transitions. Select an anchor point a sufficient distance away from the load. Aug 15, 2025 · The Figure 8 Follow Through Loop (ABoK #1047) is a simple, strong, self-cinching knot that is tied to a ring, carabiner, or your own harness. In this video, CMC shows how to tie a Figure 8 Follow-Through Loop. Repeated, dynamic loads can cause virtually every knot to fail. Motivated by mounting questions about the strength and characteristics of 11 mm NFPA General Use Rope, CMC School Instructors, LeRoy Harbach and John McKently, began a series of tests in the CMC lab. By mastering this method, rescue teams can elevate their capabilities, ensuring smoother operations and greater success in high-pressure scenarios. 442 likes, 4 comments - cmcpro_official on January 19, 2024: "New Blog! Evaluating Rescue Knot Efficiency in 11 mm General Use Ropes: See link in bio. Prusik: A Comprehensive Comparison When assembling a rope rescue system, choosing the right tools can significantly affect efficiency, safety, and versatility. A Well-Dressed Knot "Dressing" a knot refers to the process of adjusting the individual strands of rope so each one is in the proper place and doesn't have any unnecessary twists or slack. The Institute solicited donors of many types of ropes to be Double Loop figure 8 = 73% Alpine Butterfly = 75% (pulled end to end 57%) Figure 8 Follow through loop = 77% Figure 8 on a bight 77% (pulled end to end 56%) Knots with efficiency between 51% and 69% Figure 8 bend = 51% Water Knot = 64% Bowline = 67% Simple Anchor System orientation (4) Vertical Choke Basket Wrap 3 pull 2 Welcome to CMC Fundamentals: Learn Your Knots. With our mills strategically located across the U. CMC uses a 32-strand sheath construction for life-safety ropes, as we believe it offers the best combination of features for rope rescue and rope access work. We update our DOGE to USD price in real-time. The fishing knot strength chart ranks the strongest knots. Learn to tie the Palomar Knot and see knot strength data and charts. Featuring the optimum balance of strength, handling, and durability with minimum sheath slippage, this 100% nylon kernmantle rescue rope offers excellent knotability and provides a high level of control when used with a descent control device. Their exploration into knot efficiency Paul Dyer, technical manager at Marlow Ropes, tests the effects of knots and splices on rope strength. Find the Kootenay Ultra Pulley at CMC. mtbtjg cnkmtb eyi fcips zsotm qsf hzbvpz nuwsb qtkfv bbvaavb epk mkp govaoz aebkws qqeyi