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This was my first attempt to make a brake bar that wouldn't heat up. It was fastened to a carabiner by a screw that went in the end of the longest leg. I decided the fins were running in the wrong direction as the relative wind on descent would usually be vertically upward.
The screw has been lost, so I need to find a replacement.
There are fins on the back as well. The fins are not optimally shaped. I suspect that the fins don't do nearly as much as the extra mass unless one uses a water bottle to cool the brake bar, since the convective heat transfer coefficient probably isn't all that great.
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The next version of fin cooling. It is put on the carabiner by taking out the little screw and sliding the mutilated cotter pin a bit. It seemed a little crude.
It isn't clear in the photo, but there are fins on the left and right sides as well as the back.
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This one works a little nicer. To open it for rope insertion, press the end of the round pin.
The pin Darrell refers to is spring-loaded. Note the sleeves that keep the carabiner gate from ever opening.
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Why I made one for a pear carabiner I have forgotten. It locks on the carabiner with a simpler system, but the retainer wire tip needs to be filed off just a bit to make it work easier.
The wire retainer appears to have been made from a large cotter pin.
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