surveyor
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Everything posted by surveyor
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The OAR is rope specific, and you can install different size rollers for different size ropes. I have tested it so far now on Imori and Rocket line with the larger rollers. Also I find that a DMM spacer from the small pinto pulley is perfect for use as a cam/roller for the bottom rack arm. As the rack arm swings up when weighted the sheave spacer functions as a rolling cam and clamps on the rope. When pulling down on the bottom arm, the roller/cam/sheave rolls back to release. As for the pin on the Dogbone, it is very stout, and the stops on the aluminum side plates give even more support. My goal was to keep it simple, compact, snag proof as possible, and light (5 oz. with tether).
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Here you go Paul. A short video of the setup.
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I will post pictures of it set up, as soon as my camera batteries are re-charged. : ) I have posted a picture of this Dogbone before, but it did not show how the rope was inserted. The purple one was from an earlier trial. Here they are pre-anodized
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Here is the Dogbone Rope Wrench that I use, notice how the swivel link allows the installation of the rope on line.
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Coming soon?
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I have a few out there given as gifts or favors, with very good feedback to date. Here is one user who tells me he loves his Dogbone RW. You can see it briefly in action about the 2:40 mark and then later towards the end of the video. [ame=http://www.youtube.com/watch?v=P0MfhNlEC18&feature=g-user-u]Maple Prune-Deadwood - YouTube[/ame]
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Do those who may be interested, I am now able to sell my Dogbone Rope Wrench design outside of the United States!
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Thanks Paul, for that report on your various ropes. How did you like the way it captures the rope once installed? How about its slack tending? I am surprised by the reported tightness on the Ivy as that is a very supple rope. If you require pulling two arms to descend, then try pulling and holding the first arm down, while then reaching up with a finger and gently pulling the middle arm downwards also, that should give you a smoother descent (use this technique on a doubled rope also). Gordon
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Paul see your private messages. I have not tested the OAR on 11mm line as of yet. Let me know what manufacture rope you climb on and, if I can obtain some to test with, I could try to make a custom OAR for that size and manufacture. I have no long term tests for wear as this is a new prototype device, however the high grade steel friction surfaces should last well.
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The rollers and link pins are all easily replaceable.
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You should see the way the brass reflects off the shiny chain link pins : )
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I am currently experimenting with both the full size OAR and the 3/4 size for use on smaller dia. rope. One of the unique features of the OAR is the ability to interchange roller sizes for use on different size ropes, and to add rack arms as required. It is my hope that it will descend on rope as small as 9mm, but that remains to be seen, as the smallest rope I currently have is a short piece of Poison Ivy and a short piece of Rocket line. I am testing now with the short piece of Rocket Line that was sent to me for a custom made OAR.
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3/4 size OAR
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Banks, check your messages. I have not been selling the Dogbone RW because I do not want to infringe on Kevins sales, and anyway the round end of the Dogbone does not work well with the hitch on ascent. This is a better design.
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No, if I was teasing, I would tell you I had a 3/4 size OAR in the works soon for smaller dia. rope, made of all steel and brass.
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The Dogbone rope wrench is my attempt to make a midline rope wrench with no parts to remove or drop, Kevin was interested and had this one in his possession, but it was all natural metal when he obtained it. When I asked if he could return it, he was kind enough to send it back with the anodization and logo that you see pictured. Thanks again Kevin.
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I like the natural metal, red swing arms with purple rollers would be cool. Come by my place and I will let you give these a try.
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Yes it should be wear resistant. The swing arms are aluminum, but the steel pins provide the bulk of the friction, and are very high grade steel wear points.
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Thought I would update the latest development on the OAR. Here is a picture of this slack tending OAR. Because the whole device pivots, it allows the OAR to tend slack in the normal. The short demo video was filmed by my youngest son. manner. [ame=http://www.youtube.com/watch?v=5TcgfUGZUeo]swiveling slack tending OAR - YouTube[/ame]
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Kevin won the recent Charlotte competition using the Singing Tree Rope Wrench with his custom solid tether. The link provides a video news report and they show the wrench and tether briefly at about the 30 second mark. Tree Climbing In The Queen City | Charlotte News | Weather | Carolina Panthers | Bobcats | FOX Charlotte | Local News
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I like how this hitch knot performs. It releases well and grips reliably. More wraps above for climbing with on narrower rope, but the form is the same below.
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The links come factory riveted on one side, and the spring clip side could be riveted also, but it would take a special tool....
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The hitchless pulley/rack would begin to release with pressure from above, much like a regular hitch. As long as there is a downward pressure on the top arm it would continue to slip.
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Ok Max, here are the pictures. The first shows the hitchless pulley/rack with the correct installation of the hitch climber pulley in relation to the headstock. Notice the blue inner side plates that will be removed along with the head, in order to switch it out to the hitch dependant headstock pieces, which are lying beside the P/R in the picture. The next picture shows the parts removed, and the hitch dependant headstock installed with the hitch cord tied. Notice how the legs of the hitch are on the opposite side of the rope as the headstock, and notice also the relation of the headstock to the pulley.
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thought I would post this video of the hitchless pulley rack, which better explains how to install and use the device. [ame=http://www.youtube.com/watch?v=8czYPRuL8t4]demonstration video of pulley/rack - YouTube[/ame]
