Easy up

[sean1]

I was playing around with some gear and came up with this. It may well have been tried before but I've not seen it so I thought I'd put it out on the step and see if the cat licks it up! It is a slower process of ascent but it you've just had a belly full of christmas dinner it might be a good option for getting up the tree.

Basically its a normal setup comprising the knut and a petzl fixe pulley, with an ascender above the knut and a carabiner or pulley if you wish. Simply push up the ascender then pull down on the tail of the climbing rope and up you go. The ascender can then be taken off with ease and you are left with your regular setup.

There are limitations - 1 more gear 2. its slower, 3. It won't necessarily work with all combinations of hitch setup.

Personally I won't be using it much. I'm still trying to find a good way of setting up a good all round self tending system but I can't come up with anything easier than a normal climbing hitch on its own.

 

[sean1]

Another pic

 

[sean1]

another

 

[treebear]

And the advantage part from the MA is..
Svein

 

[sean1]

Presuming that the MA is the ascender - you can basically pull yourself up.. there is virtually no hip thrust necessary

 

[familytree]

hey sean, see if this is the same thing, its located here on the buzz, its less gear intensive, kinda, but nice and compact. hope this helpes

http://www.treebuzz.com/forum/showflat.php?Cat=0&Number=98854&an=0&page=2#98854

 

[familytree]

sorry, here it is, it was a thread inside a thread, here is the right one

http://www.treebuzz.com/forum/showflat.php?Cat=0&Number=92484&an=0&page=2#9248

 

[OTGBOSTON]

Thats sort of like the RADS set up I've seen Tom do for srt.

 

[Rocks_and_Trees]

It's not the same thing as the Hitch climber set-up. I just tried it and it works awesome with the revolver! You just need to move the ascender up as you go.

 

[treebing]

Maybe something that could be done is leave the throwline in the crotch and use it to pull the acender up. if you had a long rope you could pull it high into the tree and only have to reset it a few times. using a stick like that looks really awkward.

It seems like that would be a good way to have the ground people pull you up the tree as it gives them MA as well.



That is some mad MA. even a ground person pulling on that system gets a 6:1 advantage as far as my calculations go. when you yourself are pulling you have a 7:1.

do I get an A? or did I miss something.

with little pulleys, the friction hitch, and the rope crossing places it would not be that in reality.

I definitly want to mess around with that a little.
good for you.

 

[treebing]

As far as a good self tending system. FT is right about the other setups in the threads he posted.

 

[Rob_Murph]

Will try that tomorrow looks cool

 

[Stumper]

Treebing-You get an "F". Piggy back a 2/1 onto a 2/1 and you only get 4/1----minus friction losses of course.The only reason we get a 2/1 on a DdRT climbing system is that our body substitutes for a traveling block. Legs of line leving the traveling block are the relative ones in calculating MA.

 

[Fairfield]

I use a set up sort of like that for rescues when I am by my self down a cliff or in a caving. http://myspacetv.com/index.cfm?fuseaction=vids.individual&videoid=22641902

 

[treebing]

that makes sense stumper. That was my first instinct but then I looked at the scenario a little closer.

since you failed me I decided to find out using hard data.

I set up the system and tried it out and indead, i pulled EXACTLY six units of rope for every unit of up pulled.
I did it with a length of zing it, a throwbag for the weight, and a paper clip for the acender. I marked the rope then measured the rope and the lift with a measuring tape. one foot of lift required 6 feet of rope.

yeup, just tried it again. 6:1. lifting yourself adds another leg to it. therefore 7:1.

picture instead of going through the acender, the bend of rope goes over the limb and back down to your harness, then count the legs, 6. Using the acender is just a short cut to do essentially the same thing. Thats the way I saw it originally. I wasn't quite sure if that was right but I just backed it up with my model.

if you come back with some more evidence proving me wrong, ill buy you a beer sometime.

 

[treebing]

if the piggy back were independent of the other line you would have 4:1 like you said.

 

[moss]

[ QUOTE ]
Thats sort of like the RADS set up I've seen Tom do for srt.

[/ QUOTE ]

It's a DRT RADS or DRT YO-YO depending on who you talk to. Here's Wild Bill from Tree Climber's Coalition in Georgia demoing it, he learned it from some Canadian filmmakers who were using it to climb up with heavy camera gear on their backs:

more photos

If you put the Shunt on top (Tom D. technique) instead of an ascender you can descend by putting a string on the Shunt cam release and attach the other end to the Grigri or ID. Otherwise you have to take the ascender off to descend.

Here's Tom's Shunt setup on an SRT RADS but the principle is the same for the DRT RADS:

-moss

 

[Fairfield]

The foot ascender is great with that!!

 

[Mahk_Adams]

Sean1; nice setup.

Not to take away from your and treebing's creativity:


[ QUOTE ]
Maybe something that could be done is leave the throwline in the crotch and use it to pull the acender up. if you had a long rope you could pull it high into the tree and only have to reset it a few times. using a stick like that looks really awkward.

It seems like that would be a good way to have the ground people pull you up the tree as it gives them MA as well.


[/ QUOTE ]




but to give credit to an equally creative mind, Robert Phillips has also shown this type of ascent. I think he first described it somewhere in the mid 90's.

 

[Stumper]

Treebing, I'm not seeing the 6/1 but I have been wrong before... 1978 as I recall....