surveyor
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Everything posted by surveyor
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I continue to work on the OAR, and believe I have made an improvement, both to the way it fairleads, the smoothness of release, the grip on rope, and it is slightly lighter then my other three arm OAR. The video shows a working mule, I plan to add a beefier spine once I receive a material order. I do not show in the video, but I have machined a groove on the inner part of the arms in order to ease the passage of fatter ropes through the device. It likes my Yale half inch rope, and works also with my weight on Imori, tachyon, rocketline, and KMIII, it creeps only on velocity. because of the cantilever bottom arm, the grip there is more proportional to the climbers weight, as it will release for my young son with his light weight also. This OAR also will self tend with KMIII and Rocket line when there is little or no weight on the hitch attach point. I hope to receive feedback from a gathering of arborists who I am sending a demo unit to in Florida this coming week.
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It would be interesting to tether the Zillion above the zigzag (like a RW) on a single line to see if it would do SRT.
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Thanks, The rack is made from standard steel roller links (ANSI rated at over 14,000 lbs breaking strength). basically I used half the rollers as the standard roller chain, in order to make room for the rope to pass through the device. Each master link has a side plate with a spring steel clip which engages with slots in each pin, which allows the bottom link to be attached to the top hole in the hitch climber pulley. The headstock is my own design. Personally, I think the OAR is superior because it has almost zero sit back, and is mid-line useable, and the very durable steel links are easily replaceable.
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Tried the OAR to see if it will self tail with my orange Tachyon with a bit of weight on the tail.
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The pulley/rack I made (before the public release of the ZZ) was actually intended for SRT use. I have tried it low on a doubled rope, but since the headstock faced the standing part of the rope it was a bit awkward with my longer headstock. I have not had it high enough to answer your question about it self tailing with rope weight below. [ame=http://www.youtube.com/watch?v=8czYPRuL8t4]demonstration video of pulley/rack - YouTube[/ame]
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Here is an OAR set up for a doubled rope with O rig. I am trying to tidy it up a bit by using the spliced eye on the shackle, with a beeline eye and eye attached directly on the top link, and the other end on the shackle pin below. The advantage with the OAR, as I see it this way, is that the OAR does not need a biner nor a pulley (the hole on the bottom arm is for a roller with quick release pin for an axle if desired). Also it has virtually no sitback and slack can be tended nicely if limb walking, by self advancing the OAR above yourself by pulling the slack down through the OAR. Did I mention it is midline attachable also : )
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That looks very well setup!
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Here is the OAR in an O-rig configuration (single action biner for demonstration only). If the standing end of the rope is threaded as shown, between the top arm link and top attach point, then down through the biner, it creates a small bend in the standing line which holds it in place, much like a prussic. The OAR can then be advanced completely out of reach if so desired, as long as you have a tether on the slack tending quick release pin. (thanks to Thomas , Justin, and Brian for their input for this idea )
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This is such a shame, as this may turn people off to mechanical descenders. Especially since, in my opinion, it is the sharp edge on the half circle edge of the bollard that is doing the damage to the rope, as the rope is flattened running through the device riding up unto that edge.
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There has to be a somewhat sharp edge somewhere doing damage like that. When I was first making my pulley/rack, the side links were making a similar but less severe damage to my Yale XTC. After I rounded the edges it solved the problem. You will likely always see some flattening of the rope however.
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No one seems to know how long it will last, but based on the number of friction points compared to the SJ, I would guess it will start to slip on 11mm rope after about 2 years.
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reminds me of this spiral stair.
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The spacer I had was the narrower one (1/2"). It may cause problems with uneven wear as I noticed the spacer was quite warm to the touch even after a very short use.
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When I met with Paul at the Charlotte event last year, and he was showing his prototype HH, I did in fact lend him a DMM spacer to see how it worked at ground level. While the HH did descend with the spacer inserted, as Paul tried low and slow, I don't think it was that much different than the slack tending around the radius of the biner itself.
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Old Mill, I can make one for you now. PM me and we can discuss the details. Thanks, Gordon
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Here is a short video demonstrating the use of the adjustable anchor point Bulldog OAR. I first set it up to creep online SRT with my weight, then adjust the anchor for more grip on the KMIII rope, and ascend a bit to demonstrate how it releases. Then I change over to DdRT to demonstrate two ways of using it in this manner. I did not note in the video, but you can also take the top arm completely off, if you are using the OAR with DdRT only. [ame=http://www.youtube.com/watch?v=MXT0gKdmthk]adjustable grip Bulldog OAR - YouTube[/ame]
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Ben, Thanks for the review of the 4 arm Bulldog OAR. I am excited about the 3 arm OAR with the adjustable anchor as it adds versatility to the device. Not only is it not as physical large as the one you reviewed, but since the anchor point can be adjusted you can fine tune the grip to be used on different ropes and climber weights. The anchor point is also a clevis. Since the release is with the bottom arm of the OAR, the upper arms do act just like an integral RW and descent is very smooth and controlled.
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I have refined the attach point so that it is now adjustable with the brass thumb nut. With the three arms pictured I can now adjust the grip of the OAR so that it will grip with my weight on the narrowest rope I have (KMIII) SRT. I am in the process of testing on the various ropes I have. This should be useful with only two arms on the larger dia. ropes.
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The short piece of PI that I have seems to be less dense than the Tachyon and so it compresses more readily.
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In my experience Bing! the PI will slip with 2 arms on the OAR .
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Don't do it! Keep it simple. this is a self tender.
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Bing! This idea works well for your tachyon rope. The anchor point as shown for a doubled rope forces the bottom arm up more aggresively when weighted by the climbers weight, so that the clamping force on the rope is increased, and it advances a bit better also I believe. The release is a bit different also as you need to pull down with about 5 lbs. of force to inititate release. You can anchor also at either the inline anchor only (with the spine as normal) or the outboard anchor only, which causes it to work well for my weight on the tachyon for SRT
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Ben and Bing, I look forward to your review. You may try this also , as I have taken inspiration from the Hitch Hiker for SRT. Tie a 6mm hitch cord above the OAR and thread the tails down through the OAR between the arms and behind the rollers, then tie a stopper knot below the bottom arm. It then releases on a single line with the hitch as normal while the OAR provides the extra friction.
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Did I hear the HH will come out with a nickel plated special edition?
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I sent it with the same size rollers (3/4") as the one you have.
