Interesting idea, but it wouldn't work with towers that have TIC rings.
73, Dick WC1M
-----Original Message-----
From: N3AE [mailto:n3ae@comcast.net]
Sent: Wednesday, June 15, 2016 9:11 AM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Sad news N5IA SK in tower fall (Shawn Donley - N3AE)
It's with some trepidation that I respond to this thread, but there''s one
other climbing technique I have not seen mentioned in this forum.
For modest height towers, say up to 75 feet, why not climb it like a top-roped
rock climb? Have two (redundancy) mountaineering grade locking carabiners
secured at the top of the tower with a suitable temporary rope loop (like 3/16
Dacron) going to the ground through the carabiners. On the day of the climb,
use the temporary rope to pull some 9 to10mm static line (like BlueWater
Assaultline) through the carabiner to the ground.
Attach your harness to the climbing rope and have a competent and properly
equipped belayer on the ground to take up the rope and protect you during the
climb. "Competent" in this context means someone you trust your life to and
vice versa...i.e. a fellow climber.
Advantages:
1. Always on slight rope tension (provided by the belayer) so minimal fall
distance and shock loads.
2. No energy expenditure (or fatigue related mistakes) hooking and unhooking
safety lanyards to the tower during the climb.
3. Can concentrate on the climb with less distraction.
Disadvantages:
1. Need to climb in a conventional safe manner once to get the carabiners
installed.
2. Carabiners will need replaced periodically 3. Need a competent and
experienced belayer
Some comments on rope:
A typical "dynamic" climbing rope with zero slack (belayer has slight tension)
will elongate by about 10% with a 180 lb climber on it. Example: 60 ft tower.
Say you are only10 ft up the tower. So ~ 110 ft of rope between you and the
belayer. If you fall, the rope will stretch about 10 ft (but like a bungee) and
you WOULD land on the ground but softly. Fall near the top: ~ 60 ft of rope
between you and the belayer. So you'd bungee down about 6 ft. In either case,
there could be risk of injury if an arm or a leg was across a tower brace prior
to or during the fall.
A "static line" typically used for mountain rescue or rappelling into caves,
has an elongation < 3% (for a 300 lb load), so in the above example, the "fall
distance) would be < 3 ft and <1.5 ft.
A "dynamic" climbing rope will be better at reducing shock loads in a fall, but
I'd be concerned about possible arm or leg injury if either got across a tower
brace member prior to or during the fall. That's why I'm thinking a "static"
type rope and zero slack at all times (belayer responsibility).
I've climbed towers and rock for many years. Not so much rock now that I'm
older. Always felt safer on a top-roped rock climb, even compared to climbing
towers with conventional "always attached" technique and gear.
So how DO I climb towers? I use conventional methods and gear following the
"always attached" philosophy only because I rarely have an experienced rock
climber around to belay. Nevertheless, having been on both towers and rock, I
wonder which technique would be better (safety and efficiency)?
OK. Ready for the incoming stones and rocks.
N3AE
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