tensioning highlines

[tree-fancier123]

cool, thanks for the input guys, like the idea of the rigging hub, or even a large ring, handy if you haven't got 100m rope

[scotspine1]

David Humphries vid of a highline job - some good stills and vid of the set up they used

 

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[colemanjessenz]

Food for thought:001_huh:

 

vector forces are real , nice diagram bro.

forget the trifor , hand tightening with a 3.1 should be the maximum anyone should be using for highline techniques , imagine if anything were to happen and a rescue was in order....... two guys on a super tight highline makes things a lot more dangerous for the anchors , not to mention any sudden shocks etc. I'd defiantly recommend two lines equally pretensioned to distribute the weight a bit , you could get a higher angle with less force on the anchor points as there will be less weight in each line.

[David Humphries]

Prepping with a new set up for a proposed reduction on a very decayed veteran beech pollard that is to remain as standing dead due to a rare lichen. 

 

(can't really climb it due to Meripilus at base and Kretzschmaria and Rigidoporus in the top of the trunk and a  mewp can't get near it)

 

 

Thanks to advice, we are moving from one single line (that we've used before) to two static lines that can be independently lowered.

 

Set up is 2x 70m Teufelberger ultra static ropes tied/karabinered to a bat plate, srt on to the bat plate.

Pulleys at the top of both anchor trees. 

 

 

 

 

 

 

[Pete Mctree]

Nice - Two questions. Could you have tied the lines directly to the batplate? (It would remove unnecessary links) and how much bounce is there in the system when it is loaded

[Khriss]

All looks a bit involved !! ( Fun tho ) I remember some guy in Essex having a Tuepen trailered hydraulic platform that reached all over a diseased oak very similar to that ( unclimbable ) pulled with his Discovery . K

[David Humphries]

39 minutes ago, Pete Mctree said:

Nice - Two questions. Could you have tied the lines directly to the batplate? (It would remove unnecessary links) and how much bounce is there in the system when it is loaded

Hi Pete,

 

yeah i think Ali and Rob will probably tie in and terminate straight on to the plate to simplify the system when they actually do the job.

 

I wasn't on it but Ali reported some bounce but not excessive.

We're aiming for some slack in the system to reduce some of the tension.

Last time we ran this system (using patron) there was a little too much bounce hence going to a more static line.

 

 

 

[David Humphries]

15 minutes ago, Khriss said:

All looks a bit involved !! ( Fun tho ) I remember some guy in Essex having a Tuepen trailered hydraulic platform that reached all over a diseased oak very similar to that ( unclimbable ) pulled with his Discovery . K

definately more fun than anchoring on to this particular tree ( believed to be about 350 years old, which is quite a lot for a Beech) 

 

The site has access to a tracked Tuepen, but the trees on quite a slope and the reach is too short to manage the far side of the canopy.

[Khriss]

350 yrs old ! Bloody hell- tho' that slope is probably what assisted its life span , never seen one as old , K