The purpose of this entry is to discuss the Spider Rappel and to present it in a novel application for a descent on a dynamic climbing line system. The Spider Rappel is a self-belayed descending system with the benefits of reducing Blake’s Hitch friction damage, minimizing the load pressure to lower the knot, and providing a smoother descent. In the simplest terms, it transfers your weight from the Blake’s Hitch to a descending device. The hitch serves to lock off the descending device until your hand moves the knot down. Though the mechanics of descending with a Blake’s Hitch remain unchanged, you can’t ascend with this configuration. However, there are two extreme descending circumstances that would warrant its use: 1) partner rescue 2) anticipated rapid exit of the tree. In general usage, it could be employed following the apex of any climb for the purpose of reducing friction damage to the rope on descent.

The Spider Rappel is cited in only a few climbing publications as a technique that eliminates the safety concerns found with the conventional rappel and the traditional self-belayed rappel systems . The presentation of it here for a dynamic climbing line system is for your evaluation and feedback on a “low and slow” basis. It’s unknown if this adaptation to a dynamic climbing line system has been employed or published. Because the dynamic climbing line system is self-belayed, the safety risk of trying this is minimal. It’s more of a question if this is practical for tree climbing. Your feedback is welcomed.

Publications on the Spider Rappel describe its use on a static line application. In a nutshell, the configuration is the reverse order of the self-belayed rappel. The rappel device is connected to the climber with an extended loop, placing the final attachment to the rope well above head height. The friction hitch (Prusik in this application) is shortened and placed beneath the rappel device – at chest height. Hence, this is the reverse of how things are taught. For those in possession of Jepson’s “The Tree Climber’s Companion” 2nd edition, regard the Figure-8 Descent figure on page 65 and imagine the reversal of the figure-8 and the Prusik knot locations. There are several benefits to this “spider” configuration. Descending devices are pinch points. They will eat hair, shirts, gloves and the fingers within. Placing the descending device above the climber’s head eliminates that. Also, the Prusik knot can lock-up when substantially loaded. Prusiks have melted under rapid descent conditions when positioned above the descending device, where the load is the heaviest. When employed in the “spider” configuration, the Prusik doesn’t lock up and friction concerns are minimized. Because the Spider Rappel moves the climber’s weight from the friction knot to the rappel device, it’s regarded as a rappel configuration for a partner rescue. Moreover, your partner is attached directly to the rappel device, and thus the additional weight is on the device, not your harness system.

Having described what a published Spider Rappel configuration looks like, the core of this entry is concerned with adapting the “spider” configuration to the dynamic climbing line system for tree climbing applications. The modifications are simple. Begin with your usual doubled rope over a tree crotch system, connected by a Blake’s Hitch (Jepson page 53, 83). Using an extended loop from your harness, attach the descending device to a place on the rope above your head - on the running end of the climbing line. If you attach it to the working end, it hangs there and provides does nothing. The descending device could be a Munter Hitch on a pear shaped double locked carabiner (Jepson page 81) or a standard figure-8. The true advantage of this “spider” configuration is to minimize rope wear. Thus the figure-8 would be preferred over the Munter Hitch.

My evaluation on a dynamic climbing line system (Jepson page 64) indicated that the “spider” configuration on a descent reduced the load on the Blake’s Hitch while holding the climbing position steady. Your experience, evaluation and feedback will be the final judge if the benefits of reduced rope wear are worth the effort of using this system. For sure, we want to highlight any perceived weaknesses.

As a final comment, evaluation of the Spider Rappel technique in general would be interesting on the merit that that it has the potential to replace the traditional self-belayed rappel technique.

Regards,
JimK

Most of my climbs are solo wilderness climbs. When climbing solo in remote areas I am a bit more cautious than when climbing a tame tree in the city park. Because of this I have begun using a system similar to this that I learned from climbing friend and fellow climber Bob Wray this past autumn.

The system that I am using for descent on a double rope system involves clipping a mini-rack to the delta on my New Tribe harness and running my "down rope" through this descending device. I keep one hand on the down rope beneath the descending device and place my other hand on the Blakes hitch and pull it down.

Once my load is on the rack, rather than on the Blakes hitch, I will loosen the knot slightly to reduce friction within the knot and begin my descent while keeping slack in my climbing bridge. This reduces friction within the Blakes hitch and allows a smoother and more speedy descent than could be done on the Blakes hitch alone.

In addition to reducing friction within the Blakes hitch the system provides a safety back-up to the rappel rack. If I were to completely release the rope with both hands, the Blakes hitch would set itself and protect me from a fall without the problems that arise when the same thing happens on a standard SRT rappel. I have tried this several times and it has never failed to bring my descent to a halt.

While I am using a four bar mini-rack, any standard descending device would work in its place. I have tried doing this with a Petzl Grigri, but I have found that in order to descend efficiently, I need three hands---one to mind the Blakes hitch, one to operate the control handle on the Grigri, and another hand to hang onto the down rope.

Bob Wray is the only other climber I know who is using this system. When I saw it for the first time I was immediately impressed with the safety features that it offered to me as a solo wilderness climber. I now use it regularly when I climb alone.

As an example of why this system needs your evaluation, I discovered a flaw with the above “spider” configuration on the DRT. Under certain the conditions, the descending device can advance down on the Blake’s Hitch, disabling the entire system. Imagine a 140 pound climber with 230 pound partner in a rescue. There’s a chance of the descending device being pulled into Blake’s Hitch. In this configuration the descending device is on an extension from the harness and has a range of movement independent of the Blake’s Hitch position.

This problem is resolved by anchoring the descending device into the working end above and out of reach of the Blake’s Hitch. The simplest configuration would be a carabiner attached to the working end with a Clove hitch. The same carabiner is then used in a Munter Hitch with the running end. The result is a configuration that takes the load off the Blake’s Hitch, reducing friction damage to the rope. There’s a gain in efficiency with this modified set-up. The carabiner on the working end can be anchored in position before the ascent. With one quick Munter Hitch to the running end, the “spider” descent system is in place. In a similar fashion, it can be easily removed from the running end for the next ascent.

The _object_ive here is to reduce friction wear induced by the Blake’s Hitch and to extend the safe working life of your rope. Hopefully this “spider” modification fulfills that _object_ive and adds control to the descent process. Your “low and slow” test results are welcomed. It will be interesting to hear about other variations to the configuration. Consider what the possible dynamics are with a climber under 80 pounds. Would the Blake’s Hitch set in this proposed “spider” configuration where weights are low? The mechanics of the system are unchanged; the distribution of weight on the rope is different.

In response to jmaher, do you see any issues on attaching the rappel device to the working end versus the delta on the harness?


Regards,
JimK

This problem is resolved by anchoring the descending device into the working end above and out of reach of the Blake’s Hitch. The simplest configuration would be a carabiner attached to the working end with a Clove hitch

Help me here, I'm having a thick-headed moment. What do you mean by the "working end" of the rope? In a DdRT system one end is on the ground, the running edn, and the other comes down from your TIP to the saddle, becoming the workng end.

I've thought about this a little now. Do you advise using the end tail of the rope that comes out of the climbing hitch?

I have some comments about your setup but 'll wait until I have a clear vision in my head about your setup.

Have you done any reading about "backing up rappels" ? There have been many studies about the system. The problem with one of the parts releasing the other part is one of the biggest issues with a backup. A proper backup needs to be rigged so that it can never interfere with the primary device.

Instead of a backup, consider using a Petzl I'd. The I'd is rated as a two person load device. Have you used one? They are really nice! Don't get bogged down on the cost, lets talk about function first.

Tom

I've used an 8 below my blakes for several years when doing solo climbs, or after a long climb and my hands aren't working as well as I'd like.

The system is as Joe described. It works very well.

Abour the spider system I would only have a concern that an 8 above my head would mot be tended well and might get girth hitched. I've seen this happen to the careless while on rap, and it is not easy to resolve, though with a blakes below climbing back up to get to the problem would be somewhat easier.

Only problem I've had using the 8 on descent is the wicked twist I get in my Yale XTC. It dosen't twist in the bag when I'm putting it away, but just as soon as I redeploy the thing kinks. Not fun.

Climb Safe!

Icabod

Like Tom, I am a bit confused about what we are talking about here. On my DRT system I refer to the rope passing through the Blakes hitch and on down to the ground as the "down rope". That terminology comes from hanging out with Abe Winters. Is this what we are tying the descending device to? If so, I am having a very hard time trying to visualize what is going on here. Since we don't seem to have an established terminology that we are all agreed on please describe in more detail what we are talking about. I'm very interested in any systems that will reduce the risk factor inherent in solo wilderness climbing.

Cam, I have tried the figure eight descender also and I changed over to the rack quickly because of the twist factor that you are talking about.