grigri in frog system?

Discuss vertical caving, equipment, & techniques. Also visit the NSS Vertical Section.

Moderator: Tim White

grigri in frog system?

Postby David Grimes » Oct 30, 2007 9:24 pm

just out of curiosity does anyone use a grigri in place of a chest ascender in a frog system? I saw someone using one today for this purpose but it did not look like it worked very well any input on this?
User avatar
David Grimes
Admin
 
Posts: 1298
Joined: Jun 19, 2007 6:14 pm
Location: Port Richey, Fl / Harrison County, In
NSS #: 59533
Primary Grotto Affiliation: Indiana Underground Society
  

Postby paul » Oct 31, 2007 7:58 am

Using a GriGri in place of a chest ascender in a Frog system would have to be the last resort.

A jammer, especially one designed specifically for use in this position such as the Petzl Croll, is infinitely better.
paul
NSS Hall Of Fame Poster
 
Posts: 513
Joined: Dec 9, 2005 7:46 am
Location: Peak District, UK
Name: Paul Lydon
  

Re: grigri in frog system?

Postby Ralph E. Powers » Oct 31, 2007 8:33 am

dark_storm83 wrote:just out of curiosity does anyone use a grigri in place of a chest ascender in a frog system? I saw someone using one today for this purpose but it did not look like it worked very well any input on this?

Input? Well would a few well meaning giggles help? Either they were experimenting or just inexperienced to know/understand how this device actually works and what it's purpose is for.
My first question to him would've been... "why?" without expecting an answer or even wanting one.

I see (non-cavers) try to figure out ways to do ascending ropes a lot and sometimes have to shake my head at their thinking. Sometimes they got the concept down but not the specifics and other times they're totally clueless.
Without the possibility of death, adventure is not possible. ~ Reinhold Messner


http://ralph.rigidtech.com/albums.php
User avatar
Ralph E. Powers
NSS Hall Of Fame Poster
 
Posts: 2101
Joined: Sep 10, 2005 5:48 pm
Location: Chattanooga, TN
NSS #: 37616
  

Postby Carl Amundson » Oct 31, 2007 9:02 am

Well lets see, big, heavy and does not work well on muddy rope.

I think I would much rather use a prusik in that position if my chest ascender blew out.
User avatar
Carl Amundson
NSS Hall Of Fame Poster
 
Posts: 681
Joined: Nov 8, 2006 11:27 am
Location: Berryville, Virginia
Name: Carl Amundson
NSS #: 50213
Primary Grotto Affiliation: Front Royal and Tri-State Grottos
  

Postby Tim White » Oct 31, 2007 9:19 am

Climbers use a technique that employs a Gri-Gri. See: Ascending A Rope With A Jumar and GriGri
Image
And some sport tree-climbers have adopted this technique.
Image

When I owned a climbing gym, we used this technique (without the pulley to ascend the gym ropes and set routes. Makes for a very fast change-over from up to down and down to up.

Useful technique? Yes, if used in the correct setting.

Good for caving? No.
Be safe,
Tim White 26949 RL FE

Southeastern Region Coordinator - NCRC
Editor, Nylon Highway
Senior Technical Manager - Over the Edge, Inc.
User avatar
Tim White
Global Moderator
 
Posts: 843
Joined: Sep 8, 2005 11:57 am
Location: Suwanee, GA
  

Postby NZcaver » Oct 31, 2007 10:55 am

:exactly: Good info, Tim.

I've seen some of the industrial rope access folks do similar things with the Petzl I'D as well. This technique seems to be a tradeoff - less efficient to climb with than ascenders, but like you say it cuts down on time and complexity when you're doing frequent up/down changeovers.

[Edit - I meant on clean ropes, not for caving...]
Last edited by NZcaver on Oct 31, 2007 11:14 am, edited 1 time in total.
User avatar
NZcaver
Global Moderator
 
Posts: 6318
Joined: Sep 7, 2005 2:05 am
Location: Anchorage, Alaska
Name: Jansen
NSS #: 50665RL
Primary Grotto Affiliation: CCG
  

Postby Carl Amundson » Oct 31, 2007 11:03 am

My asumption is that the Gri-Gri will not work well on muddy or stiff ropes.
Any idea is this technique has been tried on anything other than clean/new ropes?
User avatar
Carl Amundson
NSS Hall Of Fame Poster
 
Posts: 681
Joined: Nov 8, 2006 11:27 am
Location: Berryville, Virginia
Name: Carl Amundson
NSS #: 50213
Primary Grotto Affiliation: Front Royal and Tri-State Grottos
  

Postby Tim White » Oct 31, 2007 11:11 am

junkman wrote:My asumption is that the Gri-Gri will not work well on muddy or stiff ropes.

:exactly:
junkman wrote:Any idea is this technique has been tried on anything other than clean/new ropes?
:question: Don't know. I won't subject any of my Gri-Gri's to that abuse.
Be safe,
Tim White 26949 RL FE

Southeastern Region Coordinator - NCRC
Editor, Nylon Highway
Senior Technical Manager - Over the Edge, Inc.
User avatar
Tim White
Global Moderator
 
Posts: 843
Joined: Sep 8, 2005 11:57 am
Location: Suwanee, GA
  

GRI GRI

Postby wyandottecaver » Oct 31, 2007 4:22 pm

What they said :) I have actually used gri gri's as belays at an outdoor climbing tower on muddy ropes while we were experimenting on how to make an easy evolution hard..... They work...not nearly as well as a rack. Tell the guy if he wants, I'll trade him a nice new set of prussics for his gri gri and we'll both be happier :P
I'm not scared of the dark, it's the things IN the dark that make me nervous. :)
User avatar
wyandottecaver
NSS Hall Of Fame Poster
 
Posts: 2902
Joined: Aug 24, 2007 8:44 pm
Location: Indiana
  

Postby FiddleCaver » Nov 1, 2007 12:56 am

Tim White wrote:Climbers use a technique that employs a Gri-Gri. See: Ascending A Rope With A Jumar and GriGri
Image
And some sport tree-climbers have adopted this technique.
Image


OK, that looks way too complicated, especially if all you're climbing is a tree. I'm sure the tree guy would say the same about my vertical rig...
Allen NSS#57424
User avatar
FiddleCaver
Prolific Poster
 
Posts: 108
Joined: Oct 5, 2006 12:04 am
Location: Ft. Smith, Ozarkistan
  

Postby David Grimes » Nov 2, 2007 2:50 pm

the guy was using it on a clean dry rope at a climbing gym may be the reason but I had always used as petzl croll thanks for the feedback.
User avatar
David Grimes
Admin
 
Posts: 1298
Joined: Jun 19, 2007 6:14 pm
Location: Port Richey, Fl / Harrison County, In
NSS #: 59533
Primary Grotto Affiliation: Indiana Underground Society
  


Return to On Rope!

Who is online

Users browsing this forum: Bing [Bot]