Compact Bulldog Bone

I figured I'd share what I've don to the bone so far.
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switched spine

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wear points

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pinto spacer. It's a very tight fit. The rope doesn't fall trough but it needs to be tight or it creeps.

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11 mm rope and not 11 mm gap between bollard and pin.

I haven't had the chance to actually climb a tree with it yet but I will tomorrow. The friction on ascend is noticeable but survivable. I had a bit of friction in my RW before so I'm used to it.
 
Tomi, I run 13mm Vortex so take this with that in mind but...If you wanted to try an experiment I would say to try something like this. If you were to reverse you lower arms so that the longer distance was between the pivot and the teardrop I would think you would increase your friction on descent and reduce some for releasing the upper arms. You of course won't have the scallops but this is only an experiment. Can't guarantee it does crap but might be worth a shot.
 
Yes the lever would be bigger and a higher force pushing the lower pin harder against the rope. I can do it as a trial in the workshop, but not climb on it. The arms have a large cut out to accommodate larger ropes and that would weaken the construction. Maybe I'll make a new pair just to test.

I found a company selling the chain links used in the bone so I've got all the spare parts I'll ever need just next town. :)
 
Tomi said:
...I haven't had the chance to actually climb a tree with it yet....
Click to expand...

There's your problem right there. Get out in the trees before you mod it too much.

Apparently, I may not have climbed with the BDB on Platinum 11.5 yet, but in the basement testing I just did, it behaved well with the 3/4" bollard running over the same section of rope repeatedly. I tried my homemade BDB with shorter upper pivot placement to provide less bite than the stock bone and it also did well. I'll give them a run in the trees with Platimun 11.5 in the next couple of days. FWIW, I'm about 175 lbs,
 
Okay here I go... I am going to flood this thread with photos.
I just got my dawg today, and wow. I haven't used it yet, but I wouldn't have to ever use it for my money to be well spent. Gordon's work is beautiful! It just looks awesome. This thing is one attractive piece of awesomeness. Thank you Gordon.
I now understand why this is called the Compact Bulldog Bone.
1. It's small.
2. It looks like a dog in...not meaning it's ugly, but it actually looks like a dog.
3. I should just show you it, so here I go.

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R u a photographer john?? Damn good looking bone there. I like to think mine looks like a pitbull with the way my arms look...
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gmcttr said:
There's your problem right there. Get out in the trees before you mod it too much
Click to expand...

I had to, if not the I just fall to the ground when I put my weight on it. Not the kind of situation I want to try up in a tree. I have gone up and down the rope (4m) until I managed to find a compromise between drag and creep.
 
John, that is one nice set of pictures! I never had noticed the dog form, in fact the Bone always looked to me like a tiny climber using his arms and lanyard to grip on the rope. You may notice that on the spine I had to remove about 5 thousandths on each side of the lower spine because all the spine parts were too fat with this new alloy.

Tomi, you may have to go with a fatter rope, because your rope will likely flatten with repeated use.
 
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I increased the distance between the spine and the bridge attachment point on the lower arm to create more leverage as well as increasing the distance between the spine and slic pin (To allow for fatter rope).

I really like the slic pin for rope install. I need amother and then the top arm friction link can be replaced with arms that have a bump on top of them and holes for a slic pin.
 
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