"Long arm" redirect idea

[ficus]

Heres an old vid of mine

[ame=http://www.youtube.com/watch?v=C2mfoJFoVBM&list=FL83VDp8HGp0ul4jT7S4Wzzg]Adjustable redirect - YouTube[/ame]

I've refined it with 10mm ocean since.

Is it similar to your idea?

Edited April 27, 2013 by ficus

[Sirnick2]

Thats a heaps better idea ficus, i was looking to set mine by tying it off with in reach but i think i'll modify it to work like yours, thanks

[Sirnick2]

Ok, tired Ficus's idea but after realising that i had to be able to isolate every limb to set the redirect i went with my original plan.

This is what i've come up with, 5m of 8mm sirus, a tri lock revolver and a 6mm OV thimble loop. I can chuck it up, hoist my climb line up and tie it off very quickly using a locked off horse knot or something else and to retrieve it, its as easy as just getting back to where it is tied and pulling it out. I'm yet to give it a good run to see what kind of forces i'll be putting on the redirect limb but i'm confident this will suit the purpose well.

[Stephen Blair]

That's really good, I am not a Knott guy, will the 1 on the ring be ok? Is it a matter of just pulling the tail end and out it pops? That would be my only concern, if a branch caught it or something and undid it!

[Paul Smith]

It's a falconers knot and it is quick release. Could be prevented with a Krab in the loop.

[BenR]

This is a sweet idea and will work really well! As long as you are mindful of the forces and angles involved and put your weight into the line while still lanyarded in it should be fine Ive done it with my lanyard before. Works well doubled rope too if you pop each leg through the separate crabs on your lanyard. I miss climbing angophoras! Enjoy it Nick.

[Sirnick2]

If in doubt i could also put a half hitch on it to lock it off. I modified it so i could tie it off or pull the tail up to choke it, like ficus's. I can't wait to use it, in theory it is so versatile.

[TKO]

That looks real tidy, nice one sirnick . Cant wait to try it out come monday. Also like ficcus' set up, guess it is all situation dependant as to which method to use, just love the idea of a retrievable redirect.

 

Quick question to DMC, dependant on the tie off area say 5ft down the same limb (creating essentially a Fishing pole) are the forces reduced at all? If the entrance and exit angles of the TIP would be greater than that of a base tie. Could this be helped further still by encompassing multiple limbs within the anchor in order to spread the load?

 

any suggestions would be sweet

cheers

[BenR]

Could this be helped further still by encompassing multiple limbs within the anchor in order to spread the load?

 

Multiple limbs will spread the load. Have a read of working the angles. http://vtio.org.au/Content/wp-content/uploads/2010/07/Working-the-Angles-i.pdf

 

Its also thinking about which direction you are pulling the limbs and the force you are putting through them.

 

Say you are redirecting at the same height as you original TIP. That gives you about a 90 degree bend in your line. 90 degrees equals 1.41 times the force you are putting on the line. If that redirect is set up in the same fashion as nick mentioned (essentially a base anchor in the tree as a redirect) then you are adding on the force (dependant on the angle of the redirect sling) onto the force that is already present. I think thats what Dave was getting at, unless I have completely misunderstood what was going on.

 

If you add onto that pulling a branch on its weak axis, you could quite easily snap a redirect that may have taken your weight on a straight pull directly down.

Edited April 28, 2013 by BenR

[D Mc]

...Quick question to DMC, dependant on the tie off area say 5ft down the same limb (creating essentially a Fishing pole) are the forces reduced at all? If the entrance and exit angles of the TIP would be greater than that of a base tie. Could this be helped further still by encompassing multiple limbs within the anchor in order to spread the load?...

 

The force multiplier would still be there, but as you say, only to the point of tie-off. This " long arm " technique should be quite useful in the right circumstances but care and good judgment will be needed to prevent unanticipated loads.

 

One of the greatest assets of SRWP is that the rope does not need to move in order for you to move. Understanding this opens up many unique opportunities for creative support.

 

Unlike rigging where most times we are using larger and less flexible points for loading, the upper canopy flexes, a lot. Adding a pulley to the line at the point of angle change can increase the efficiency of the applied lateral force.

 

We are so conditioned to needing our rope to move, that we often overlook some great alternatives. With the "long arm" one could be the use of an Alpine-butterfly tied at the right point of the climbing line and clipping into that. Once hauled up to the redirect point the fixed line would add strength and support to the branch, like a cable.

 

The potential of the static-ness of the SRWP systems can be very challenging to recognize but oh so useful.