softbankhawks
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Everything posted by softbankhawks
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Now there's a thing, tracing significant cultural trees. Did you make the connection or was the work because of the connection? Seeing these photos makes me wish that I'd applied for your arborist position last summer! Oh well... ...
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You are willing to travel to the UK to do it? I can give you a number for a course in the south eastif so....I think that there may be one coming up too.
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Treemotion harness and petzl chest harness set-up
softbankhawks replied to Steve Bullman's topic in Climbers talk
I had him cornered. -
Treemotion harness and petzl chest harness set-up
softbankhawks replied to Steve Bullman's topic in Climbers talk
The croll is too high when clipped on the bridge. Get two cut away webbing slings and two small shackles. join one to each of the lower dee's on the t.m. clip the krab to the slings and the croll above. you can get more stretch when ascending. good luck and stick with it. -
I managed to drag myself out for a night climb over christmas. I climbed in a beech woodland on the south west coast in Wales in a small village called Dale. I really enjoyed it.
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Bodean, did you butt-hitch that lump in the last picture your balls must be M A S S I V E !
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There was a very good reason for not taking the top out....Graham spoke about at treebuzz....but it escapes me now. If we keep talking I'm sure he'll hear down in tasmania soon enough and chip in....?!
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Yes please!!
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An overloaded pull line can promote a barberchair.
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So more simply put, it is the forces going IN that we should think about aswell?
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Optimisation of what?
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This model concentrates the D.W.T. I confused the compound dynamic rigging with the static D.W.T. rigging. Continue....
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To answer your question..weight is not the issue again, here, it is force ( ft/lbs )...yeah..? That's interesting. Instinct kicks in when the GRCS is straining to pick something....OK....I'm going to look into this more. Wouldn't the mechanical advantage lessen the poundage throughout the pulleys (or wherever the forces run at that particular situation)? Assuming that the tree will not fail on recieving the load. While winching up 700 kg, will not 700kg be maintained until the piece is hanging, if we imagine that the cut is perfect and the hinge wood does not fight? A question. A 2:1 MA means that the piece weighs 350kg? Another one. Where is the displacement, if any? Curently reading Ken James papers on Mass damping......the forces involved to breaking point are of interest to arborists by way of understanding the dissipation of energy within crown mass and harmonic frequencies re: failure. I'll look out for this.
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As the double whip tackle terminates and forms a closed loop, like a traditional climbing system, then there would be no weight increase at that point?
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So it would be a rope strength issue?
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If we look at diagram 3, which pulley would be the anchor?
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What do you mean? A piece of the tree or rigging gear? The tree is the UNKNOWN QUANTITY. I'm trying to get my head around the extent of 'abuse' that my rigging gear can take and how to use the tree to my advantage.
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I meant that the GRCS would be winching up, so no additional weight would be added into the system as it breaks its hinge, as opposed to dynamic rigging. Once the piece has been cut....it gets lowered.
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I'm following a chart....12.5 - 0 seems to make little odds. 0 degrees 2x 20 degrees 1.97x 30 degrees 1.93x 45 degrees 1.84x 60 degrees 1.73x 70 degrees 1.64x 80 degrees 1.53x 90 degrees 1.41x 120 degrees 1x
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Kippers for breaky on Sunday. What? You don't eat kippers on a sunday?
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it is not quite zero but close to it as the piece hangs from the pulley.
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To get more purchase with the GRCS the end of the rigging line can be used to achieve extra mechanical advantage. By placing a pulley on the said piece and running the tail away and cinching it off ( I presume next to the last pulley).
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hey! come on! I want some INPUT:001_tongue:
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On the last picture there is a black line running upwards from the piece to be cut. It stands for a double whip tackle extension tied off with a running bowline for a static pick. Any clues to the change in weights because of this?
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