Descending / rappelling

The preferred choices for descending ropes while caving are the 6-bar J-frame rack (aka Cole rack), the 4-bar micro-rack, and the bobbin. These devices have the common benefits of allowing a lot of friction control in a variety of conditions, a friction path that won’t cause a twist in the rope, the ability to attach and detach the device from a rope without disconnecting from the harness, and a long track-record of safety.

This is a general overview of the types of descenders used to rappel in caves. Get one-on-one instruction from someone with extensive experience before attempting to use such devices. Companion videos will be coming soon that will cover the detailed use of bobbins, u-frame micro-racks, and j-frame racks.

Bobbin Descenders

Bobbin descenders utilize a pair of bobbins (aka spindles or pulleys) that are fixed and generate friction as the rope passes around them. They are one of the shortest and lightest descenders, and are easy to carry through a cave. The short length and ease of inserting and removing the rope make them ideal when negotiating alpine rigging that relies heavily on rebelays and deviations.

This tutorial covers the basic uses of bobbin style descenders for use in vertical caving. Seek first-hand instruction from cavers with significant previous experience before putting this information to use.

The Petzl Stop is widely used in vertically intensive international caving areas such as Mexico, Europe and China. In 2019 the Stop has been redesigned and now is fully stainless steel, and has a new spring-loaded release lever.

Petzl is releasing a new version of the Stop auto-locking descender in the summer of 2019. The new device has a redesigned brake release handle and both bobbins are made of stainless steel. This is a short preview of the features and design changes as well as first impressions of the operation.

The Petzl Simple is the modern version of the original bobbin from the 1960’s. It has seen only minor changes over the past 50 years. In 2019 Petzl is releasing a new version of the Simple. The only significant change is a larger oval slot in the fixed side plate that accommodates the new version of the Petzl Freino carabiner.

A short review of the design and function of the new Petzl Simple bobbin. This device will reportedly be available for purchase in the summer of 2019. Caves are delicate and potentially dangerous places.

Micro-rack descenders

Micro-rack descenders utilize a U-frame and usually four brake bars. They also have 1-2 hyper-bars. They are a good alternative to bobbins for use with a Frog ascending system for those who prefer the versatility and function of a brake-bar rack.

This tutorial covers the basic uses of 4-bar micro-rack descenders for use in vertical caving. Seek first-hand instruction from cavers with significant previous experience before putting this information to use. Where you can buy the BMS Micro-rack: On Rope 1: http://onrope1.com/descending-equipment/bms-micro-rack-long-w/dual-hyperbars/ Inner Mountain Outfitters: https://www.innermountainoutfitters.com/bms-micro-rack-long-with-dual-hyperbar/ Karst Sports: https://www.karstsports.com/bms-micro-rack-long-frame-dual-hyper-bar/ A video overview of descenders for caving: https://youtu.be/c14gUdwZJtw Video on bobbin descenders: https://youtu.be/h_sfCG8aasI Caves are delicate and potentially dangerous places.

Standard Racks

Open J-frame racks are preferred in the southeastern US and on very long free rappels over 100 meters (300 feet). The standard version of this device, originally designed by John Cole in the 1960s, is a frame that is 14 inches in length with 6 brake bars.

For more detailed information on caving techniques, caving gear, and cave projects, visit my website at: https://www.derekbristol.comCaves are delicate and p...