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shear reduction device

I was looking at vertical gear and came across the CMI shear reduction device https://www.cmi-gear.com/products/shrd . It is available from several dealers. CMI and the dealers give specifications about its strength and that it will take 1/2 inch rope. None of them explain what shear reduction is an...
by Bob Thrun
Oct 23, 2016 11:13 pm
 
Forum: On Rope!
Topic: shear reduction device
Replies: 1
Views: 1519

Re: Fox Mountain Caves?

Firefighter912 wrote:Why is it called Cemetary Pit? I heard something from a local about some bones being found on a ledge.

Cavers used to park at the cemetery, which was not close, and hike up the mountain. This was before the Interstate was put in.Try to find an old SERA or TAG guidebook for directions.
by Bob Thrun
Oct 19, 2016 7:41 pm
 
Forum: Caving General Discussion and Questions Forum
Topic: Fox Mountain Caves?
Replies: 14
Views: 6839

Croll hazard

The current model of the Petzl Croll, with the stainless steel wear plate, is getting very strong criticism in the Uk. http://ukcaving.com/board/index.php?board=8.0
by Bob Thrun
Aug 20, 2016 7:51 pm
 
Forum: On Rope!
Topic: Croll hazard
Replies: 0
Views: 1229

Re: Libre Map Project

I want the old Libre Map Project back. It was awesome. It listed almost every state and each state listed ALL the maps in alphabetical order. They were downloadable in TIFF format or could be opened online. I do not see the point of the Libre Map project. The USGS has ALL the US topo maps as downlo...
by Bob Thrun
Aug 6, 2016 12:37 pm
 
Forum: Open Talk Forum
Topic: Libre Map Project
Replies: 9
Views: 2205

Re: Resting while using Mitchell system

I use Mitchell and have never had difficulty resting. I find it hard to remember the details of how I rest. Do you have a safety sling running from your upper ascender to your seat sling? I just sit down and put my weight on my upper ascender.
by Bob Thrun
Jul 22, 2016 2:25 pm
 
Forum: On Rope!
Topic: Resting while using Mitchell system
Replies: 8
Views: 4898

Cavers Digest

I want to complete my collection of Cavers Forum and Cavers Digest messages. A cavers' mailing list was started in January 1988. I don't know who started it, I don't have message No. 1. Ron Lussier sent out the membership list in message No. 5. There were 31 members. The list was first called Cavers...
by Bob Thrun
Jul 9, 2016 4:37 pm
 
Forum: Publications
Topic: Cavers Digest
Replies: 0
Views: 897

Jumar sling rope

Does anybody know what kind of rope was provided as foot slings on the old (pre-1972) Jumars? I identified it as probably linen in my book as the best guess of several cavers. I have recently purchased linen or flax rope on Etsy. (I now get spam at least once a week from Etsy.) Some on a climbers' f...
by Bob Thrun
Jun 4, 2016 8:17 pm
 
Forum: On Rope!
Topic: Jumar sling rope
Replies: 0
Views: 2372

Re: Carbide Lamp Burner Tips

Paul Johnson and Bill Fritz have a vendor's tent and a couple tables of carbide lamps at OTR.
by Bob Thrun
Apr 19, 2016 11:23 pm
 
Forum: Equipment Forum
Topic: Carbide Lamp Burner Tips
Replies: 6
Views: 3930

Re: WVASS bulletin 10 : Friars Hole map

ohiocaver wrote:Did you try http://wvacs.org ?

WVACS does not publish cave bulletins. They are published by WVASS, as stated in the title of this thread. Bulletin 10 seems to be still in print at http://www.wvass.org/publications.html
The folded maps are not listed separately.
by Bob Thrun
Mar 5, 2016 5:30 am
 
Forum: Caving General Discussion and Questions Forum
Topic: WVASS bulletin 10 : Friars Hole map
Replies: 3
Views: 2408

Re: American Caves for sale

I will take them. Check will be in tomorrow's mail.

Bob Thrun
204 Blair Rd, Apt.204
Indian Head, Md. 20640
by Bob Thrun
Feb 19, 2016 6:34 pm
 
Forum: Speleo-Marketplace
Topic: American Caves for sale
Replies: 3
Views: 3056

Re: Atwood Rope

When I went to the Atwood website a couple days ago, it said that the rappelling rope was "Made from 100% HTPE fibers". Now it says "Made from 100% High Tenacity Polyester fibers". Other vendors take HTPE to mean high-tenacity polyethylene. And there is HDPE, high-density polyeth...
by Bob Thrun
Jan 27, 2016 5:44 pm
 
Forum: On Rope!
Topic: Atwood Rope
Replies: 21
Views: 10281

Re: Atwood Rope

Atwood's static rappelling rope is "made from 100% HTPE fibers". That is High Tenacity Polyethylene. In the absence of specific numbers, high tenacity is synonymous with high strength. These fibers are often called Ultra High Molecular Weight Polyethlene, or UHMWPE. Well, Bob, you got my ...
by Bob Thrun
Jan 26, 2016 4:50 pm
 
Forum: On Rope!
Topic: Atwood Rope
Replies: 21
Views: 10281

Re: Atwood Rope

A few previous threads have bashed Atwood for making "unsafe look-alike" ropes. The specific ropes mentioned were not marketed as climbing ropes, but looked like them. This was viewed by many as irresponsible, and maybe it is, but that's another matter. Atwood does make static rappelling ...
by Bob Thrun
Jan 23, 2016 10:06 am
 
Forum: On Rope!
Topic: Atwood Rope
Replies: 21
Views: 10281

Re: Need help picking a good first cave.

frbarton wrote: Any good features? I really don't want to turn her off by doing anything too technical for her first time.

Since the Friars Hole System is the longest cave in West Virginia, you should be able to find something interesting. The 100-foot Crookshank Pit is part of the system.
by Bob Thrun
Jan 1, 2016 4:28 am
 
Forum: Caving General Discussion and Questions Forum
Topic: Need help picking a good first cave.
Replies: 15
Views: 7431

Saving bats from WNS

Caving News (further down on the Cavechat web page) has an article "Missouri Bat Census Spotlights local cave conservation". This article explains the problem of WNS much like many other articles. However, it says Earlier this year Alvey-Mudd was a member of the inter-organizational team w...
by Bob Thrun
Jul 1, 2015 11:13 pm
 
Forum: White Nose Syndrome (WNS)
Topic: Saving bats from WNS
Replies: 1
Views: 1194
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